Question about 1991 Cadillac DeVille

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1990 deville, replaced ecm, fuel pump, filters,

1990 deville, I have replaced the ecm, fuel pump, filters, relay..still no fuel to rail. Fuel sentry is reading 8 gals, then goes to a flashing "E".

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  • honeymokey
    honeymokey May 11, 2010

    Check connectors at pump for power or broken wire.

  • Anonymous Mar 16, 2014

    how do you flash an ecm in a 1998 deville

  • Anonymous Mar 16, 2014

    how do you flash an ecm after puting a new one in a 1998 deville



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I had same problem in my 90 deville. Drove myself crazy, I replaced the sending unit in the tank with a new fuel pump. I also had to replace the fuel pressure regulator, which sits behind the rail system. It worked for me.

Posted on Jul 13, 2009

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Wow...BIG problem...I'd say you have a bad ECM - maybe you hooked it up "hot"? otherwise, check all grounds for secure connections.
Good Luck

Posted on Jun 14, 2009


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New fuel pump still no fuel

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A mechanic would check the injectors for voltage and for a ground signal from the computer.
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It's a 1991 deville,the fuel pump is not pumping fuel, all fuses are good, sat for awhile, runs if you dump fuel in intake, 30 seconds

Hello, did you check the fuel pump relay also? It is in position H in the fuse box under the panel on the passenger side. Can you hear the fuel pump run when you turn the key on? Fuel filter clean?
Checked fuel pressure at the fuel rail? If the fuel pump is not coming on, need to determine if it has voltage at the connector on the tank. If voltage is present, and ground is good, then the pump is bad. I hope this helps.

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1990 Deville, new fuel pump, new ICM, 40 psi on fuel rail, got spark, start the car and it runs fine for short time then dies. I have found out that something kills power to the injectors. Shut the hood,...

Replace the fuel Pump relay in the Power distribution box under the hood. Also, start checking the wiring harness back to the fuel pump for shorts. Most likely this is the relay cutting out every time it is pumped or jiggled but it is possible, however slight, that the problem is a short.

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