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fuel pressure drop at full boost

1370 Views 2 Replies 1 Participant Last post by  Zerosoul
I have monitored fuel pressure drop at high boost higher gear pull. I did the leak down test and all vacuums are leak-free now.

after reading RX-7 Faq on fuel, (yeh they are more sensitive on fuel issue than supras) I discover a drop in pressure at full boost and heavy engine load usually means the fuel pump is maxed out.

what do you guys think?
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easiest thing to test is your FP regulator. Do the 5 in shutoff test and check what your fp is. Then check idle fp, with key turned to on, and with the FP hose disconnected. how many miles do u have on your car? Pumps are pretty dang reliable. Sounds like FP dampener bypass ;)

FR damper bypasses.
I have HKs FPR. holds 30psi for an hour after engine turns off.
this is a 40,000miles 98 turbo pump.
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