I just went to adjust my fuel pressure for the first time. I bought my TPI setup used so I do not know who's Adj fuel pressure reg I have. Anyway, when I turn the adjusting screw just a tiny amount, the pressure jumps like 5 psi. seems like going from 40 psi to 60 only takes less than an eight of a turn?? Is it supposed to be this sensitive?? Thanks

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Dave Zelinka

 

It really depends on the screw. My JET isn't that sensitive, but I have heard that others are.

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'87 Trans Am
S/D TPI retrofit including functional PassKey,
22# injectors,
JET AFPR,
Ported Plenum,
TB Coolant Bypass,
SSM SFC,
Boxed LCAs,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
KYB Shocks

'97 Bonneville SSE

 

What brand do you have? My Holley isn't sensitive at all.



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87 IROC-Z, 5.7, auto, 3.27, leather, !cat, Holley fpr, K&N'S, SLP 1-3/4" Jet-Hot coated headers, SLP .218/.224 .495/.502 cam, Comp 1.5 roller tip rockers, $uperPITAram, Edelbrock lower intake, Holley 52mm tb, Dynomax\Flowmaster catback. Coming Soon(?)- Fasttrack/Accell DFI

1989 Pontiac 20th Anniversary Turbo Trans Am - 160,000 miles, K&N filter

 

I have a TPIS AFPR and it isn't that sensitive either. Also I haven't heard anyone that had one that sensitive. But that is just me.

 

Thanks guys!! my regulator is made by Crane I think based on the picture in the Summit catalog. I recently bought a used fuel rail that came with a different regulator and I swapped it in last night. It has a black cover and an allen head adjusting screw. It works alot better. It seems the adjustment works real good from 30 psi to about 44 psi, after that it gets very touchy. Looking at the design, I think this is due to the small spring at the bottom running out of travel. At this point the pressure shoots up. Also, I noted that with high pressure setting the vacuum corection does not work very well at all. With 17" of idle vacuum, the pressure reading should drop about 7 psi when vacuum is connected. When my pressure was set high, it would only drop a few psi and it caused a lean condition when the throttle was depressed from a steady cruise. I have it set now to 44 psi and will see how this does.

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Dave Zelinka