[rfmaster]

Originally Posted by irongun324

Well now that I finally could test fuel pressure.... Im getting less than 8 psi at the throttle body. So bad pump? Or could it be grounds?
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IRC you have replaced FPR diaphragm. The only other reason why FP might be low is a weak or broken FPR spring. If you had BOT putting TB together then spring is probably OK. 8 PSI is barely enough to idle engine - I run my fixed FPR TB's between 15 and 18 PSI (with adjustments in EPROM). Increased FP improves fuel atomization.

1) Bad or tired pump (after 20+ years in service it is done).
2) Burst in the fuel hose between pump outlet port and tank sending unit.
3) Low voltage at the fuel pump terminals. (Should be around 12.5+ Vdc with engine running at the tank terminals)

Most of the time it is 1 & 2 with #2 causing #1. When you get a replacement pump make sure to replace the hose with SAE30R10 - fuel submersible rated fuel line. Do not use commonly available 30R7 or 30R9. Most pumps kits come with fuel hose supplied - it should be the correct type. If you pump kit is missing this hose you can get it from Napa - 3/8" ID part number H213 (Gates 42196184). Kragen and Autozone do not carry, unless special order.

//RF