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Update, pump replaced... now getting 70 PSI with flow obstructed.
Still getting 0 PSI on return side.
The FPR is located on end of the secondary fuel rail where the fuel return should begin.
I am now getting a trickle of fuel out of the pressure relief valve on my tester when testing the return side... I think my original theory is still the problem, I just happened to catch the pump on its way out too.
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1988 GXL
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