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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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Vapor lock is caused by fuel getting too hot in a fuel line or fuel rail and is rare since modern fuel system circulate fuel fro the tank to the fuel rails and then excess goes back to the tank. Are you sure you have vapor lock? Please describe all symptoms.
It could be a vapor lock but not likely. Since the introduction of fuel injection vapor lock has been eliminated. You need to figure out if you are loosing fuel pressure or spark when it will not start back up. Could be a fuel pump relay or ignition module among other things. Even a problem with the vent for the gas tank.
dont know motor size but it sounds like you have a vapor lock situation with your fuel lines ,try wrapping all fuel lines with black snake skin plastic wrap like what is on your spark plug wires .
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.
you need to check fuel pressure on fuel rail,you need at least 55psi of fuel pressure to fire up.check fuel pump fuse and relay or any anti theft problems
Any check engine light or codes? My first thought would be tps or possibly fuel filter. As car builds up pressure a clogged filter would cause your symptom.
Pressure relief valve is working. Any other ideas would be appreciated....
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