Update... The car is running!
I got the FPR from jfaplanet this evening and installed it... the Haynes manual I have says I should get 35.6-37.0 PSI on the return line without vacuum on the FPR and 28.4 PSI with vacuum... I am STILL getting 0... at this point I'm inclined to believe that the Haynes manual is incorrect.
I'm also inclined to believe that the car wasn't running due to gross stupidity on my part... having initially replaced some very ugly spark plugs, I swapped the leading and trailing wires when re-assembling... the symptoms were the same so I didn't catch my mistake until now. The original problem was the plugs, I'm too stupid to re-attach plug wires correctly.
On the plus side I think I've now replaced darn near every part in the fuel system aside from hard lines and rails...
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1988 GXL
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