Question about 1996 Cadillac DeVille

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1996 cadillac deville want start

No gas getting to the throttle. i detached fuel line from filter turned key forward and fuel pump pumps gas but when i put line back on filter and turn key forward gas still does not reach throttle

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  • wally_sermon Aug 26, 2008

    i took the line off between the filter and the throttle at the filter

  • Castle Towery May 11, 2010

    Did you take the line off between the pump and filter?If so replace the filter.

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If you had a strong stream of gas shooting out then you may have an fuel injector problem. Possibly a clogged injector or bad injector.If the stream of gas was weak replace fuel filter first and test again.If problem persists check pump fuse then replace pump. sorry for miss reading your post.

Posted on Aug 27, 2008

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Yes, it should. If it is conventional (like other GM cars), the pump will turn on for a couple of seconds when key is turned to on. This will prime the system for starting. When key is turned to start (cranking), the pump is turned on again at the relay, and pump stays on as long as cranking the engine happens. Once engine is started, the oil pressure switch keeps the pump running.
The best way to check if pump is good is to use a fuel pressure gauge. If it does not have a test port called a Schrader valve on the fuel rail, the pressure gauge must be teed in somewhere convenient. But if you take off the line at the filter, some gas should come out with key on, and when cranking the engine gas should come out in a steady stream.

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1 Answer

I have a 1996 deville. I have replaced the in tank fuel pump and can hear run for a minute but I cant get fuel to the rail I disconected the lines and nothing still.


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Sometimes you have to jumper the pump relay to get it to run long enough to get the air out of the system and the new pump primed.

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First, obviously, put gas back in the tank.

Check the fuel pump fuse, (20 amp yellow fuse in the lower left corner of the group). If that is not blown, turn the key on and pound hard on the bottom of the fuel tank. The fuel lubricates the fuel pump, once it runs dry, the pump can lock up. Once the pump is immersed in fuel again, a sharp jolt will unstick it and let it pump up to pressure again. If it locks up for too long, the pump will burn out and need replaced.

We found this out by accident, got mad and pounded on the bottom of the tank and the pump jumped to life.

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