Would appreciate insight on my cold start issue

[RenaissanceMan]

Originally Posted by 80stech

No that's exactly backwards, it's 50 PSI with the fuel pump running (doesn't matter if the engine is running or not) and 46 ish when the fuel pump stops. If you would have left the relay in place when you did your testing you could me confidant about your diagnosis.

Thank you for the clarification. So after testing again, here is what I’m seeing:

With car off and fuel pump power jumpered at the relay plug: 50psi

With pressure tester still connected and with relay replaced, I then start the car. Pressure tester still reads 50psi.

I then shut the car off. Pressure very very slowly will drop after about 5 min it’s about 47-48psi.


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