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Fuel Pressure with car running varies between 20 and 28 psi. Standard is supposed to be 34-39 psi. Replaced fuel filter. No help. Disconnected fuel return line and ran fuel pump got 20 psi. How do I know if I have a fuel pump problem or a fuel regulator problem? Car is driveable, but low speed performance is bad and will often quit on idle down. Any ideas? Thanks.
'90 IROC ragtop
 

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I would suspect either a faulty fuel pressure regulator, or pump problem. To test for a regulator problem, pinch the return line closed while engine is running-gage attached to fuel rail.

If the pressure does not go above recomended pressure, look at the fuel pump or strainer sock in the tank.
 
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