Question about 1997 Cadillac DeVille

1 Answer

No fuel to fuel rail have to prime to get to run new fuel pump and reg

Posted by Ricky Foster on

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1 Answer

Anonymous

There is no priming

Your pump isn't staying on for some reason

Need to diagnose that issue

A wiring diagram would speed things along,
and give you places to check and do some
testing

Posted on Feb 14, 2011

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I have a 2005 Buick lasabre fuel filter and pump have been changed car want start


It can take a little bit to get the pump to prime and make it to the fuel injector rail! There should be a fitting on the fuel rail that connects to all of the injectors, and is similar to a valve stem on a tire, depress the pin inside that fitting and cover with a rag to avoid getting sprayed with fuel while somebody turns the key to on without cranking the motor over! The fuel pump should run for a few seconds every time you turn the key to on position before starting the car, and it may take a couple of those cycles to get fuel back to the fuel rail and have the correct amount of pressure to the injectors. You will also hear the pump slow down and change tone when it gets primed and up to pressure!

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I changed my fuel pump because it has 260,000 miles on it and truck would cut off when It got warm. Now it wont start after I replaced pump. What do I need to do to get it to start again?


Did you put at least 5 gallons in the tank so the pump will prime properly? Do you hear the new pump running for 1 second when the key is turned to run? Do this remove the Schrader valve core from the fuel supply rail to the injectors on the engine fuel pressure test port (don't loose it) and repeatedly cycle the key from off to run, do not crank the engine, this will help to prime the electric fuel pump, but have at least 5 gallons in the tank before starting the process. Make sure someone watches the fuel pressure test port so when fuel starts to flow you stop the priming process before everything is covered in gas. Also a fuel pump doesn't cause the system you described, an ignition control module and stator cause that and are a known problem in this year of truck. Another problem is the ignition starter switch comes apart.

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1 Answer

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you may have an air leak in the petrol line, probably where the fuel pump was changed.
the car won't srpay out petrol some time's but overnight the vacum in the fuel line ****'s air in & the system is not primed.
The only way you can check this is by priming the rail first thing in the morning by turning the ignition key to the point just before starting & you should hear the fuel pump run for about 4 second's then turn off the ignotion, wait for a few sec's & turn the key to same position, it will prime again.
Do that a few times & check for petrol leak's as the fuel will run back to the tank via a pressure valve, If you see a leak then you've found where the air is getting back in if there is no leaking but the engine start's then you will have to go over all the hose clip's in the petrol system.
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