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1991 Cadillac DeVille will not start the fuel pump comes on when I turn the key on then sets of like it should then I started yet it still won't start if I squirt starting fluid is low body it will start

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Posted on Jan 02, 2017

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SOURCE: 1999 Cadillac Deville- Won't start!

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.

Posted on Aug 22, 2009

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1 Answer

My 1998 Cadillac deville won't start or do


It needs fuel, air and electricity to run. There are sensors and an engine computer that will keep it from starting. You have to investigate all the systems in order to eliminate them as a cause or to locate the problem.

Oct 31, 2017 | Cars & Trucks

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1982 Cadillac DeVille with Digital Fuel Injection, won't start. How do I know if the fuel pump is bad?


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.

May 26, 2017 | Cars & Trucks

1 Answer

1991 cadillac wont stay running it will start up and run for a second then cut off and then i will have to let set for a day then the same thing happens


possible fuel pump or fuel pump circuit... need a fuel pump guage to determine if its loosing pressure.. should be approx. 45lbs continously..

Apr 03, 2010 | 1991 Cadillac DeVille

2 Answers

1991 cadillac deville fuel problem


fuel pump relay is in engine compartment on drivers side under the flap the two relays that are together ,it is the bottom relay,,u cant by pass.if relay is good ,if it clicks when turning over and key on and off (it should click and go off if key is turned on) then use a test light and ground it find wires going to top of tank and probe wire have some one turn key on ,it should light up test light and go off ,if this happens ,replace fuel pump

Jul 03, 2009 | 1990 Cadillac Deville

1 Answer

1990 DEVILLE. Posted 6-14. New BCM, new fuel pump, new relay, still no fuel. Have tested wires, I get a brief 12 volts to grey wire on connector to fuel pump when key is turned on, then nothing. I can hear...


That is correct for initial prime,then fuel pump works off of crank sensor.Fuel pump is ussually controlled through ECM not Bcm.Have you checked for fuel preasure when you first turn on key,

Jun 15, 2009 | 1991 Cadillac DeVille

2 Answers

Seems as if no fuel is getting to the dfi system. how do i check to find if the fuel pump is not working or if the fuel filter is clogged?


Turning the key on will make the pump cycle at least once. turn key on and off listening to or getting help listening to the fuel tank area of the car. check filter by removal. If you go as far as to remove it, just replace it.
Also would be helpful to know year and engine if this doesnt solve your trouble.

Jan 15, 2009 | 1991 Cadillac DeVille

2 Answers

1999 Cadillac Deville- Won't start!


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.

Dec 13, 2008 | 1999 Cadillac DeVille

1 Answer

1991 cadillac sedan deville


get new key with newer chip or replace ignition cylinder.

Sep 22, 2008 | 1991 Cadillac DeVille

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