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Will not hold fuel pressure - Sentra Nissan Cars & Trucks

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  • dmitry rosenberg
    dmitry rosenberg Dec 28, 2013

    hooked up a fuel pressure gage.



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If a system will not hold fuel pressure then there are several areas that will be at fault. the fuel pump may have faulty non-return valve, the pressure regulator is not sealing off correctly, the injectors are dribbling and not sealing off or you have a fuel line leak

Posted on Dec 28, 2013


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Force 120, 1999, no start cold, stalls out after running for 10 min, cranks hard restarts after sitting few minutes. Think fuel pump, any mercy mechanics out there that can give me a hand with this

Don't know this car. Check fuel pressure with a fuel pressure gauge- if correct, not a problem with the pump. Also make sure the pressure will hold for some time with key off. It should hold pressure for several minutes, maybe 20 minutes, some maybe a bit less, but it must hold pressure for a time. If pressure is good, check for spark when it won't restart. If spark is lost, suspect the crank position sensor.

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Maybe the vehicle is flooding? Check vacuum line on fuel pressure regulator, where applicable, if it has gas in it, the fuel pressure regulator is faulty. Use a fuel pressure gage and check proper fuel pressure. Also, with key off, see if pressure will hold for a bit? As long as no fuel pressure bleed-off passages in throttle body, the pressure should hold for a bit.
There could be other issues.

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Sounds like fuel pressure regulator faulty, not holding correct pressure in rail. Check fuel pressure before and after filter, attach fuel pressure tester to rail turn key on check pressure, does it hold? If it doesn't regulator is bad.

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I have a 1993 Pontiac transport van and it will start up and run for 5 or 10 seconds and die

You may want to do a fuel pressure test to start. The pump could be defective. The fuel pressure should hold steadily and not decline with the pump off. If the fuel pressure falls, you either have a fuel leak, stuck injector, faulty fuel pressure regulator, or a bad fuel pump check valve. If the pressure holds at the correct spec, note the pressure as the engine runs and then dies. If the guage shows correct pressure, you can then move on ruling out the fuel system.

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Sounds like fuel pressure is bleeding off. This could have a relatively simple solution but not necessarily cheep. The fuel filter on your vehicle is also the fuel pressure regulator. Replacing it may solve you issue. I would check fuel pressure with a fuel pressure gauge first. You should see fuel pressure hold for a long time when the key is shut off. If fuel pressure drops quickly (I suspect it does). Than I wouldn't hesitate to start with replacing the fuel filter. This filter is not cheap and will run you about $80 to $100 dollars off the top of my head. It is located under the vehicle on the drivers side just in Front of the rear tire. Once the filter is changed check fuel pressure again. If it holds than the problem is solved. If it still does not hold that the fuel pump is the problem. The catch is that you have not

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On first crank fuel pump doesnt hold pressure and has to be cranked on for several seconds

sounds like its not working properly, the fuel pump pumps or it does't, then goes to regulator this is where pressure is adjusted. check fuel pressure with gauge, sometimes even new fuel pumps don't pump enough fuel. most fuel injected cars have over 50 pounds pressure.

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The fuel pressure when ignition is off is 0. and the car takes long to start sometimes

With a fuel pressure gauge hooked up. the fuel pressure shoul d go up when you turn the key on. The fuel pump will only operate for about 2 seconds, then shut off again. The fuel pressure should hold steady for at least 5 minutes. If it does not hold, this is the reason for your hard start. It could be caused by a leaking fuel pressure regulator or more likely, the check valve in your fuel pump assembly. To find out which one it is, find a place in the fuel return line that is made of rubber and pinch the fuel return hose off with a pair of pliers. Repeat the fuel pressure test. If the fuel pressure now holds steady, your problem is the fuel pressure regulator. If it still drops, replace your fuel pump.

Jan 29, 2011 | Nissan Sentra Cars & Trucks

1 Answer

I have1997 4.3 ther.body i trun key rolling engr over get 50 psi wen stop rolling eng over feul psi go to 0psi right now

Does the truck run? 50 psi should be enough to start the truck. The fuel pump my not be able to hold the pressure. You may have an injector stuck open letting the fuel pressure drop. It could also be the fuel pressure regulator. It is very hard to find those problems because fuel injectors and regulator are mounted inside the intake. If you can find a way to block off the return line of the fuel pump you can see if it then holds pressure. Then try to block off the pressure line right after cranking to see if the pressure holds. This will let you know if the pump is working correctly.

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1997 GMC 1 ton 4x4 hard to start after it has warmed up. changed fuel filter no help No code to be read We have notice that the fuel in the rail is vapor not a liquid. Is this normal and if not what would...

The fuel pressure should hold at or near the 45 lbs after you shut the truck off.
You have one of three problems causing this.
One, the fuel pressure regulator is leaking internally and allowing fuel to return to the tank via the return line. To verify, use a pair of pliers and gently pinch the return line off. Turn the key on to the run position, the pump will run for 2 to 5 seconds and pressurize the line. Watch the pressure gauge, it should hold pressure. If it does, change the regulator.

Two, the check valve at the pump is weak. To verify, turn the key to the run position, when peak pressure is reached, gently pinch the pressure line and watch the pressure gauge. If the pressure remains near the peak pressure the check valve is bad. Replace the fuel pump.

Three, if neither of the above procedures work, you have a leaking injector. You will want to remove the fuel rail, pressurize it to find the bad injector.

Any one of these failures will cause the "vapor" issue you describe.

Good luck, let me know what you find.

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1 Answer

Toyota rav4 1997 after i drive it about 1 hour it began to turnoff end difficul to start ,i wait 15 minutes after its ok

check fuel pressure possible fuel pressure regulator is going bad. fuel pressure should at 45 to 55 lbs.fuel pressure should hold for 5 min to 7 mins. if doesn't hold replace fuel pressure regulator

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