[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?

 

[sidwin]

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

Sid

 

[Zerosoul]

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