Question about 1990 Cadillac Deville

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On and off fuel pressure @ the fuel rail of a 1990 cadillac deville. Get it running for a bit and then it acts like it is vapor locking. have already replaced fuel relay, fuel pump, sock and filter....

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  • bloom_n64 Sep 13, 2009

    Pressure relief valve is working. Any other ideas would be appreciated....

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Check pressure relief valve

Posted on Sep 12, 2009

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I have a 93 nissan 240sx with the KA24DE engine. I have been getting vapor lock after running the car for a little while and parking it. When I get in the car it will turn over for about a second then...


It's possible that the fuel system is slowly leaking down somewhere. Nissan injectors are known for leaking at the intake where they connect to the rail. Also, if the check valve in the pump is bad, fuel could be running back to the tank. The engine needs 30 psi in the fuel rail before the engine will start so if the system leaks down somewhere while the car sits, it will take a little while for the pump to build pressure again. If you can connect a fuel pressure gauge to the fuel rail, you'll be able to watch the pressure after you shut the engine down. It should hold residual pressure for a long time, if it doesn't, you will need to find where it's leaking down to.

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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.
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