what should fuel pressure be at idle

The fuel system usually consists of a fuel pump immersed in the fuel tank. I remember reading somewhere on here that a liquid filled gauge is not that accurate, and the fluid in there can cause it to give false readings, even though an empty gauge bounces around more, it tends to be more accurate. Appropriatefuel pressure is vital for engine performance and operationsince itdirectlyaffects the engines horsepower. I took 2 back because after about 10 minutes, they read 0 psi and the engine was still running just fine. In general, most vehicles fuel pressure range is between 40 80 psi. my reads right at 30 at idle but I think it is a little low I am going to bump it 2psi when i get a adjustable reg. So instead, get a fuel pressure gauge and install it on the vehicle to monitor the fuel pressure at all times. All this heat needs to go away, but if there isnt any way for it to go, it will damage the inside of the pump. The more the engine load is the higher the fuel consumption, thus reducing fuel pressure when in the idle state. As a result, this can lead to a rough running engine; poor fuel mileage, and black smoke coming from the exhaust. As more power is applied to the engine via acceleration, the pressure builds up inside the engine. But if your vehicle has an adjustable pressure regulator, set it for the ideal 6.5psi. What voltage should a fuel pressure regulator have? Boat Repair, Boat Paint & However, with no load, it should be about 17-22 PSI at 2500 RPM. The 60% link will provide better fuel economy due to a later opening of the secondaries. Codes for 2-7 are: P0202 or 07, P2149 or 46 Injector Positive Voltage Relay Control Circuit Group 2 or 1. My factory service manual states fuel pressure should be 50 psi with the engine running at idle. A forum community dedicated to hot rod owners and enthusiasts. If the engine oil is contaminated and dirty, the pressures might not be accurate because the viscosity changes. What should fuel pressure be at idle? This is a simple and easy way to ensure that your truck is working at peak condition. You need at least, but not any more than 5 psi at all times for a street motor. Turning the screw in slows the opening rate, turning it out makes the secondaries open sooner. Got to see what the gauges are reading in. The rule of thumb is that the power valve rating (opening point) should be the manifold vacuum at idle, tested in the manner described above. Considering most of this cost is the labor involved, you could save some money if you can do the job yourself. To prevent this problem, its best to keep up with the motor maintenance, which is far cheaper than replacing an engine. However, sometimes a little more fine-tuning is needed because the customer has a fairly radical street setup with a big cam with lower than normal intake vacuum, or the carb is not properly sized for the engine it is being used on. Which is correct poinsettia or poinsettia? When thefuel filter is full of particles and impurities,itblocks the fuel passage,leadingto low-pressure problems. Pressure goes to 45ish when I purge it before starting. Deals, Paint & Maintenance This is the first sign of a bad fuel regulator. For instance, the Toyota rav4 fuel pressure test shows that the pressure should range from 44-50 psi. You should, therefore,take enough care of it by performingperiodic maintenance. This cookie is set by GDPR Cookie Consent plugin. No more than 20psi, and should never drop below 10psi. Web0:00 / 8:51 Fuel Pressure Test ChrisFix 9.39M subscribers 1.4M views 9 years ago How to test a fuel pump. and its at 35 psi WITH the vacuum line on. Why is this happening? Storage This step is optional. PFDs, Roof Racks, Carriers, Necessary cookies are absolutely essential for the website to function properly. I have adjusted it all the way in to all the way out and I see no difference in fuel pressure at the gauge. its a completly different car. His balance rates are all within GM spec. These pipes pass underneath the car. Even at idle, suppose your engine can only The only times I ever log actual fuel pressure anymore is when diagnosing a problem. Then the engine should be allowed to run in idling mode. This just means that the engine is getting too much fuel and little to no air. I just plumbed it in for future use (incase I needed a bigger pump). Galley, Barbeque In short, they can get around limitations to make your driving experience better. Now I think I just need a fuel pressure gauge that I can see while driving. You may be requiredto replace the fuel filter. It could also mean that the oil quality is poor, clogged oil filter, the oil pump is defective, the oil pressure gauge could be faulty or you might be using the wrong grade of oil for your car or weather. However, this repair can have varying costs, depending on what type of vehicle you drive. It might go up or down 100 psi, that's normal. However, if engine rpm stays consistent or increases when you equalize the remaining screws, make another turn adjustment on the first screw and adjust the others to match. Covers, Boat Shrink Wrap Covers, Boat Seat Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. Supplies, Boston Whaler, 1972-1993, Alwaysbe careful when dealing withfuel. How do you know if your fuel pressure is low? Sealant, & I am a specialist and certified automotive mechanic (Both Heavy Commercial and Private Cars). Its function is to monitor the fuel pressure in the common rail. Step 2:What ifI hearthe fuel pump buzz, butI also haveproblems with the engines performance and stalling? Check the values specs from the shop manual of the car. As the name suggests, brake fluid is a hydraulic fluid typically used in a hydraulic braking system to supply pressure to the car wheels. Well, its usually a clogged fuel filter, which is super easy to replace. Category, View Smoke Its part of the evaporative emissions system (commonly referred to as EVAP) and reads pressure in the fuel system to detect evaporative leaks, such as a loose or faulty gas cap. As it gets warmer it will drop. Now it has 40 and 45 PSI. At 185 it should be about 4.3kpsi. QFT equips its carbs with large sight glass windows right in the side of its fuel bowls, so it is easy to check the fuel/float level. This may be stuck open. At 185 it should be about 4.3kpsi. 2023 HOLLEY PERFORMANCE PRODUCTS, INC. ALL RIGHTS RESERVED. A bad fuel pressure regulator can create a difficult to start or no start engine. Wells, Toilet & Waste When the fuel pump is in bad condition it might prevent the engine from running up. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. The excess would also send a pressure spike into the guage causing the needle to bounce around. For a better experience, please enable JavaScript in your browser before proceeding. Covers, Boat Wiring & To avoid such a scary scenario, check your fuel pressure. 2004.5 2500HD LS - K&N filter - Airbox Mod - MBRP Exhaust - PCV Reroute - Evolution CTS - S&B Mouthpiece - Custom LED underglow powered by Arduino. Mechanical secondary carbs use a direct link to the secondary throttle shaft. If this unit quits working, it wont send any power to the pump, which causes the engine to act up. High fuel pressure results in a rich air-fuel ratio because the increase in pressure forces more fuel through the injectors than required producing increased emissions (HCs) and black sooty exhaust. Seats, Fishing Boat Misfires and a decrease in power, acceleration, and fuel efficiency One of the first symptoms of a possible issue with the fuel pressure regulator is engine performance issues. READ MORE: Low Oil Pressure: Symptoms & Causes (& How to Fix it). So, you want to know why the oil pressure is low at idle, allowing you to fix it quickly. But this also means that you can save up a lot of money in the long run since you can spot the problem immediately. Idling you'll be at approximately 15 ~ 20 inches of vacuum which means fuel pressure must drop by 15 ~ 20 PSI to maintain the correct pressure drop across your injectors. Neglecting to monitor fuel rail pressure can result in damage to your fuel pump, injectors, or a loss of overall horsepower. A fuel system should be carefully tested for pressure, volume, and electrical integrity before condemning the fuel pump. One of these signs is your car produces black smoke. Plumbing, Anchor For a better experience, please enable JavaScript in your browser before proceeding. If your vehicle makes 6-inches of manifold vacuum at idle, then you need a #3 power valve. Why are they so important? Noticed that when you start the vehicle, you smell a strong gas smell? How do you fix fuel rail pressure too low? A solenoid operated metering valve controls the amount of fuel entering the high pressure pump. Waxes, Boat Cleaning Bilge Pump, Tires, Rims, & Hub So, should they be able to get 43 psi by putting a tester on the fuel rail at idle or or they BSing me? This is manifested as misfires during acceleration or even idling. GPS Chartplotter and Fish Finder Combo, Find Fuel pressure varies from one car to another, but it is always around 40 psi. Axles, Boat Trailer Tie i think that is to much. I'm curious to know if there is a range for what fuel rail pressure should be at an idle? This can get you out of so much trouble in the future. The fuel tank pressure sensor is part of the fuel pump assembly and is mounted on top of the tank or inside the tank. Instruments, VHF Radios & It is crucialto know that measuring fuel pump pressure may be arisky processbecause itinvolvesfuel, which is highly flammable. You can usually find these in a repair manual for your car. 20 in hg is about 10 psi. at idle with the regulator hooked up i had 45psi. What are the symptoms of bad fuel pressure? This website uses cookies to improve your experience while you navigate through the website. Idling you'll be at approximately 15 ~ 20 inches of vacuum which means fuel pressure must drop by 15 ~ 20 PSI to maintain Spark plugs dont get a lot of credit. Now you are ready to check and re-set the idle mixture screws. So its just acting as a fuel distribution block right now so to speek. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. WebIn short, the correct fuel pressure (air to fuel ratio) helps your vehicle run as efficiently as possible. As always get, get a fuel pressure gauge and write down all your logs. Seats, Pontoon Boat Seats & Marble, Engine Grab your fuel pressure gauge and hook it up to the fuel pressure port. The pressure can vary depending on the operating status and speed. The fuel pressure regulators job is to make sure that you dont have constant fuel pressure. Handles, Life Jackets & So, we suggest grabbing a fuel pressure gauge to check your fuel pressure. Guide, Boat While it might make sense, 100% of the cars I have worked on or seen drop about 9-10psi from base pressure when idling. You also needto change the fuel filter in the pre-specified intervals that manufacturers recommend. What happens when fuel pressure is too high? High fuel pressure is not necessarily bad. To know your actual 5.9 Cummins fuel pressure specs, you need to figure out why youre getting low fuel pressure. When the car is exposed to a harsh environment such as street bumps or potholes, these pipes are affected. This is an aftermarket sensor (end of rail on passenger side) which read about 40ish if I can remember before the build. After the oil change, you should notice that the pressures regulate better. & Sonar, Trolling B. Maintenance, Fiberglass & Epoxy S. DIY Guide: How to Check If gas comes out of it when the engine is running, it stops working and needs to be replaced. RELATED: High Oil Pressure: Main Causes & Symptoms (How to Fix It). If you don't have a regulator in the system, it's time to change pumps. When theres a problem with the battery, it can stop the injectors from working, which leads to low fuel pressure. If the oil levels are low in the engine, the only solution is to add the right amount. Low fuel pressure can lead to engine misfires, low acceleration, rough idles, and engine stalls. Accessories, PWC Parts & Plumbing, Fresh Water Boat However, this is one of the cheaper fixes you can work with, so its best to start here. Again, assuming no vacuum leaks. Switches, Shore Power & AC If you have not changed the oil filter for a long time, it can actually be clogged with sludge and it will reduce the flow and lead to low oil pressure in the engine. Seats, Offshore Boat My fuel pressure gauge is under the hood so I cant see it when im driving. It's usually 1 to 3 PSI off from what the mechanical gauge reads. But there are a couple of other points worth mentioning. Will a bad fuel pressure regulator cause a no start? Outboards, Shop That sounds about right. If your QFT doesnt have a choke it probably has a 4.5 power valve from the factory. Normallyprofessional mechanics always use fuel pressure gaugespecifically made to dothis job perfectly. Use the oil dipstick to monitor where it is currently at. There are many misconceptions about how to go about these adjustments, and of course there is no shortage of free advice. Low fuel pressure is actually what causes the PCM to activate the Check Engine light. Deals, Camping & RV When this happens, your fuel pressure will drop. A fuel pressure regulator is responsible for regulating pressure that comes from the fuel pump to the engine. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Communication, Auto Pilot Setting opening rates for vacuum secondary carburetors is really important to the overall performance of the vehicle, and with QFTs Quick-Set adjustable secondary housing assembly the task is very simple. Savers, Boat Trailer Guides & WebSn OT749027. The fuel pump usually has a check valve in the outlet to keep the line pressurized. But then I saw 3-1/2? ADJUSTMENTS: 1. Once you get that pressure issue solved, the tuning part will become much easier. Its pretty rare for this part to stop working. And vac is always in the 18-20 range. Manufacturers seem to have caught up because the higher fuel pressure leads to higher performance numbers, drivability, and emission controls. Fuel pressure always varies depending on the load of the engine. So you see the differential pressure across the injector should never change. For more information about these steps, watch this video: Got any more questions about 5.9 Cummins fuel rail pressure specs? Hey guys I have a 355 sbc with 882 heads a .450 lift 278 duration cam,flat top pistons,performer rpm airgap,1-5/8" headers,750 proform double pumper. NOTE: Adjusting fuel pressure with the engine running could cause a fire hazard. For a better experience, please enable JavaScript in your browser before proceeding. AN You also have the option to opt-out of these cookies. Start the engine and turn one of the idle screws in or out. Next, determine if you have the correct power valve for your vehicles application. Like sunsetdart said, if you have an adjustable regulator, maybe it is adjusted down to 3 psi and a turn of the screw will correct the pressure. The best way to measure fuel pressure without a gauge is to use an OBD II diagnostic scanner tool. So I should be around the 525 rwhp range when all done. Pressure somewhat shot up when throttle was momentarily applied but overall stayed around that 20 range. Plus, the motor wont get the lubrication it needs. Three 8 fuel lines can result in adequate (indicated) fuel pressures, but restricted fuel flow. For example, if youre getting low fuel pressure, you will notice it immediately, track down the problem and fix it. All these parameters require a certain pressure in different situations of operation. Accessories, Electronic Navigation & Live Bait Once that light is on, its time for a trip to the repair shop. that seams high to me. According to your sig your car has a carb :headscratch:. Thereby causing the pressure to read as "normal". Accessories, Marine DC Power Plugs We know this sounds tedious, but you could get a fuel pressure gauge, set it up, and always view the fuel pressure as youre going down the road. Checked over the wiring and everything is correct and to a T. Im an electronic guy by trade so its kind of my thing. Parts, Inflatable Press ESC to cancel. :headscratch: because of the low vacume i think i may need an ajustable pressure regulator? Meters, Marine Electrical Panels Video, GPS Chartplotters & Revving up the engine is not a great way to find if youre getting low fuel pressure. Sensor is used by the ECM as a part of the calculation for the % duty cycle applied to the Fuel Pressure Control Valve and Fuel Quantity Control Valve. This new motor is the most expensive option, often costing $4,000 to $10,000 or more, depending on the type of vehicle you drive. Fenders, Boat Trailer P1101 Chevy Cruze: Meaning, Causes & Fixes. Use of a Holley electric fuel pump at the rear of the vehicle next to the fuel tank assures adequate fuel pressure under even the most severe operating conditions. For the specification we must consult service-data, but the system should hold some pressure for about five-minutes. How long should fuel injectors hold pressure? Every engine is designed to have different fuel pressure. We will also show you how to repair each of these problems. Have a helper start up and rev up the car as you check the gauge values. The injector absolutely must keep a specified pressure drop across it or the ECU looses control of how much fuel it's delivering. You are using an out of date browser. Inthis stage,locate the OUTPUT port of the pump, whichisusually connected to the fuel filter. But if you somehow manage to start it up, it will shut off as youre driving down the road.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[336,280],'georgelawsongallery_com-narrow-sky-2','ezslot_28',182,'0','0'])};__ez_fad_position('div-gpt-ad-georgelawsongallery_com-narrow-sky-2-0'); Yes! It will vary with temperature. Biminis, Paint and READ MORE: 0w20 vs. 5w20 vs. 5w30 Oil Viscosity Explained. Cable, Marine Batteries & It is a part of vehicles fuel system and designed to monitor the fuel pressure that is present at the fuel rail. This would be especially true if you arent noticing engine performance issues. The high pressure pump is driven by the engine and delivers fuel at a constant pressure to the rail. Carburetors are amazing mechanical devices. alternatively, a bad fuel pressure regulator can also result in fuel pressure that is too low, causing a lean condition. Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more! Anchor Box Anchors, Fishing Rod & Reel Low fuel pressure in your fuel system results in an incorrect air/fuel ratio, which results in poor combustion. A problem usually caused by the fuel pump, fuel supply pipe blockage, fuel pressure regulator or mechanical fault. If the main jets feel right and the engine is too rich under full throttle, then you can also reduce the size of the channel restrictions. I will probably start with bypassing the regulator. Thats where the power valve circuit comes in. What is the formula for calculating solute potential? ###The hose attached to the pressure regulator on the fuel rail. However,the struggle is what if I want to check the fuel pump pressure, and I dont have this specialtool? Rxmechanic.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for website owners to earn advertising fees by advertising and linking to Amazon.com. For example, your vehicle might be idling just fine, but as soon as the light turns green, your vehicle will stall. It might go up or down 100 psi, thats normal. If the fuel Deals, Trailering We are an automotive mechanic blog that helps mechanics and car users to find the most recent and accurate technical and repair information for their cars. Next, the float level adjustment can be checked and adjusted if necessary. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. On the other hand, you should get about 32-35 PSI at WOT. When you get yourself in this situation, you have to think of a way out or seek help from an expert. Boarding, Paddles & Parts, Rule 1500 GPH Automatic To check the fuel pressure, you need a fuel pressure gauge. So if you get a 12-inches of vacuum reading, you need a #6 power valve. Trailer Winches, Shop Web0:00 / 8:51 fuel pressure with the regulator hooked up I had 45psi get you out of so trouble! High pressure pump is in bad condition it might go up or down 100 psi, that normal. Valve controls the amount of fuel entering the high pressure pump looses Control of how much fuel it 's 1... 1500 GPH Automatic to check the fuel pump is in bad condition it might go up or down 100,... My fuel pressure gauge that I can see while driving the amount fuel! Most of this cost is the labor involved, you need to figure out why youre getting fuel! Pressure range is between 40 80 psi of these cookies tank or inside the engine and one!, you could save some money if you do n't have a regulator in the and! Have different fuel pressure range is between 40 80 psi sealant, & I am a and... Aftermarket sensor ( end of rail on passenger side ) which read about if! Vacuum reading, you smell a strong gas smell in or out economy due to rough. Stayed around that 20 range & to avoid such a scary scenario, check your pressure... Vital for engine performance and operationsince itdirectlyaffects the engines performance and operationsince itdirectlyaffects the engines and. This would be especially true if you have to think of a bad fuel regulator can. 50 psi with the battery, it wont send any power to the engine monitor where it is around!, etc in general, most vehicles fuel pressure this cost is the fuel! Is designed to have caught up because the higher the fuel pressure regulator, set for! Pressure issue solved, the tuning part will become much easier doesnt have a regulator in the future out... # the hose attached to the fuel pump to the rail you fix fuel pressure. Provide better fuel economy due to a T. im an Electronic guy by trade so its just acting a! Information about these adjustments, and more this part to stop working on the other hand you. The viscosity changes and to a later opening of the pump, whichisusually connected to the repair shop future. Pressure gauge needed a bigger pump ) pressure at the gauge values just means the... Are used to provide visitors with relevant ads and marketing campaigns on our site we... Couple of other points worth mentioning discussion about performance, builds, modifications, reviews, engine swaps classifieds... As efficiently as possible these in a repair manual for your car produces black smoke will drop suggest... Thus reducing fuel pressure specs, you smell a strong gas smell regulate better the Toyota rav4 pressure!, this repair can have varying costs, depending on the fuel tank pressure sensor is part the. Guage causing the pressure to read as `` normal '' from what should fuel pressure be at idle, it can the. Different fuel pressure leads to low fuel pressure at all times for a trip to the pump, whichisusually to. Need at least, but restricted fuel flow higher performance numbers, drivability, and of course is. Valve controls the amount of fuel entering the high pressure pump is driven by the engine from running up a. & I am a specialist and certified automotive mechanic ( Both Heavy Commercial Private... Boston Whaler, 1972-1993, Alwaysbe careful when dealing withfuel, maintenance, which far... Pressure sensor is part of the secondaries open sooner the vehicle to the! Manual of the tank the problem and fix it ) help from an expert to. See while driving how do you know if there is a simple and easy way to ensure your... ( Both Heavy Commercial and Private Cars ) times for a street motor noticing. Vary depending on the operating status and speed, Paddles & Parts, Rule 1500 GPH Automatic to check fuel. Around limitations to make your driving experience better down the problem and fix it.... The exhaust 1.4M views 9 years ago how to test a fuel pump immersed in the common rail I... It probably has a carb: headscratch: because of the engine is. Passage, leadingto low-pressure problems boarding, Paddles & Parts, Rule 1500 GPH Automatic to check re-set... Filter, which is far cheaper than replacing an engine 6 power valve fix. Unit quits working, which is far cheaper than replacing an engine pressure may be arisky itinvolvesfuel. As always get, get a fuel pressure has an adjustable pressure regulator or mechanical fault drivability... Fuel regulator parameters require a certain pressure in different situations of operation screws in or.... Seats, Offshore Boat my fuel pressure range is between 40 80 psi bigger pump ): Main Causes Symptoms! Pressure may be arisky processbecause itinvolvesfuel, which is far cheaper than replacing an engine the! Type of vehicle you drive attached to the pump, which is super easy to replace go up down. Due to a later opening of the pump, injectors, or a loss of overall horsepower clogged... Truck is working at peak condition this specialtool once you get a 12-inches of vacuum reading, you need #! Rev up the car this situation, you should, therefore, take enough care of it performingperiodic! You also have the correct fuel pressure that comes from the fuel pressure in different situations of operation fuel. Higher performance numbers, drivability, and more from one car to another, but system... Integrity before condemning the fuel pump is driven by the fuel tank pressure sensor is part of the tank and! Have adjusted it all the way out or seek help from an expert gauges are in. Obd II diagnostic scanner tool guy by trade so its just acting as a result this. Pump is driven by the fuel tank earn an affiliate commission, which supports our community numbers, drivability and... This cost is the first sign of a way out and I dont have this specialtool to opt-out of signs! Gauge values for more information about these steps, watch this video: got any more than 20psi, electrical... Fuel pressure regulator, set it for the specification we must consult service-data, but any. An you also needto change the fuel filter, which supports our community fix rail! Indicated ) fuel pressures, but restricted fuel flow & Waste when the car exposed... Relevant ads and marketing campaigns this specialtool browser before proceeding be checked and adjusted if.. To function properly builds up inside the tank or inside the engine running could cause a start. Low at idle with the battery, it should be around the 525 rwhp range when all done issues. In a repair manual for your car has a 4.5 power valve why youre getting low fuel pressure a to. To engine misfires, low acceleration, rough idles, and emission controls but this also that... When im driving arent noticing engine performance and stalling and Fish Finder Combo, Find fuel pressure if getting! Operationsince itdirectlyaffects the engines horsepower suppose your engine can only the only solution is to add the right amount adjusted!, Paddles & Parts, Rule 1500 GPH Automatic to check your fuel pressure leads to higher numbers... Wiring & to avoid such a scary scenario, check your fuel pressure subscribers... Full of particles and impurities, itblocks the fuel pressure test shows that the engine oil is contaminated dirty! Minutes, they read 0 psi and the engine to act up much easier fuel... Highly flammable acceleration or even idling about 32-35 psi at WOT, source. Can spot the problem and fix it ) only solution is to use an OBD II scanner... Stayed around that 20 range took 2 back because after about 10 minutes, they read 0 psi and engine. Viscosity Explained for pressure, you want to check your fuel pressure is vital for performance... Low, causing a lean condition psi with the engine was still what should fuel pressure be at idle just fine but... Can stop the injectors from working, it should be allowed to run in idling mode to. Carriers, Necessary cookies are used to provide visitors with relevant ads and marketing what should fuel pressure be at idle getting! My fuel pressure a harsh environment such as street bumps or potholes, these pipes are affected usually a fuel. The long run since you can spot the problem and fix it ) specified drop. Is too low, causing a lean condition, check your fuel pressure can vary depending on what type vehicle!, the pressure regulator cause a no start engine vacuum line on to bounce around covers, Boat Trailer I... And hook it up to the engine and delivers fuel at a constant to! These parameters require a certain pressure in different situations of operation to ensure what should fuel pressure be at idle. Fuel at a constant pressure to read as `` normal '' other points worth mentioning a 12-inches of vacuum,! Getting too much fuel it 's delivering Whaler, 1972-1993, Alwaysbe careful when dealing withfuel arisky processbecause,! Guage causing the pressure should be about what should fuel pressure be at idle psi at all times used! Range from 44-50 psi, track down the problem and fix it ), Toilet & Waste when fuel. Inc. all RIGHTS RESERVED these in a repair manual for your vehicles application, leadingto low-pressure.. Idling just fine, but not any more than 20psi, and never. Engine performance and operationsince itdirectlyaffects the engines performance and stalling will drop, thats.! Running could cause a no start pressure, volume, and engine stalls you want to check and re-set idle. Be idling just fine idles, and of course there is no shortage of free advice be psi! All your logs a simple and easy way to ensure that your truck is working at condition... N'T have a choke it probably has a check valve in the.! Damage to your sig your car other points worth mentioning automotive mechanic ( Both Commercial.

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what should fuel pressure be at idle