Does it work to test fuel pressure while cranking an engine, with the fuel line terminating into the tester? or does the engine have to be running/ does the tester have to be tee'd into the fuel line.

If not I am getting 3-4 psi before the regulartor and suspect a broken fuel pump.

 

Gauge shoud be teed and not deadheaded as the stock system is a bypass system. Deadheading the fuel at the gauge will give the max output reading of the pump, if that's what your goal is.

 

what trochoid said.

- alex

 

Does the vehicle have to start for this to be accurate or is cranking enough

 

83 and earlier, turning the key on should start the pump. 84-5, crank.

 

My old fuel pump started at 10psi and built up to 40 after 20 min... I replaced it and get 50 PSI all the time now!!

 

That's fine for an FI SE, but that pressure will blow the gaskets in his carb and collapse the floats.

 

OOPS.. I should have told him that.. Sorry!

 

Thank you so much!