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Fuel injection loses prime overnight. - S 10 Chevrolet Cars & Trucks

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You need take the injectors and test them see if leaking and make sure there volts are right sounds like your injecters are leaking atleast one is maybe more

Posted on Sep 11, 2010

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Car has been sitting up and will not start now. It seems to not be getting gas and I do not know how to prime a fuel injection system. Any help appreciated.


There is only a few cars fitted with an ancient petrol injection system that needed any priming.

Diesel engines mostly need the injection system priming but petrol injection systems do not.

Lots of cars use a system where the fuel pump runs for a couple of seconds when the ignition is switched on and that is all the time it takes to prime the fuel system. After a couple of seconds the fuel pump switches off and waits to restart when the engine is cranked.

As priming the system takes only a couple of seconds some manufacturers don't bother with the brief priming run of the pump and just have the pump start when cranking.

Could be faulty supply, fuse, pump relay or the pump itself.
If the car is fitted with an immobiliser, perhaps that is the problem.

May 07, 2016 | 1998 Mercury Mystique

1 Answer

Why will my 1998 chevrolet cheyenne not start unless primed after sitting overnight


by primed are you supplying a fuel source if so then the car is not getting fuel to burn. this indicates your fuel pump is bad and needs replacing and change the fuel filter also. the reason the pump won`t work sitting overnight is that the pump can`t build up enough pressure possibly because the fuel pressure is not being held, but after the first start up the system can maintain enough pressure to start through out the day. you can have the fuel pressure and volume checked with a gage when the problem occours to verify.

Aug 25, 2014 | Cars & Trucks

1 Answer

Losing gas for restart


The most common cause is a faulty check valve in the fuel pump if your vehicle has fuel injection. If it has a carb it may be leaking into the intake.

Jan 05, 2014 | 1984 Chevrolet Chevy

1 Answer

Losing fuel pressure


Fuel Pressure Regulator Clogged Fuel Filter.

Apr 25, 2013 | Cars & Trucks

2 Answers

Where is my fuel pump at? on a 1995 chevy camero 3.4 yes ran the car out of gas put so in wont start now what should i do first


Your fuel pump is in the tank. Turn on the ignition, and listen if you can hear the pump run in the tank. It will only run a few seconds if the engine is not running. You can repeat this several times to prime the fuel injection.

Feb 11, 2010 | 1995 Chevrolet Camaro

1 Answer

Silverado not starting unless prime


There is a check valve in the fuel pump that sounds like it may have gone bad. Check the fuel pressure at the shredder valve, there should be 60 to 65psi during the prime and will drop 5 psi when the engine is running. Once the fuel line is primed, check to see how fast you lose your prime. Since you replaced your injection system, we can eliminate the fuel pressure regulator leaking which was common on the injection system your truck run's on. If the fuel pressure drops fast then it's going to be a bad check valve at the fuel pump and it may be time to replace the fuel pump it self. Good luck and hope this helps. Note: do not try to start the engine with putting gas through the throttle body, it's been know for small fires to start and burn the spider injectors. 

Sep 04, 2009 | 1999 Chevrolet Silverado 1500

2 Answers

85 ford diesel 6.9


Most common cause is a air leak into the fuel system at the filter bleed valve.

Sep 20, 2008 | 1990 Ford F350

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