My fuel pressure has been moving on me. I set it at 8, was at 3 today so I set it back up. I have the stock tpi fuel pump with mallory 3 port regulator. I figure my 87 fuel pump might be the problem, what do you think ??

Is the jam nut loosening on you? Just wondering I'm installing the mallory reg today. But I have the tbi fuel system, so maybe since it's not such high pressure, max of 15 psi I think it won't be a big problem for me.

The nut is not moving, I'm sure of that.

It's a pretty simple design. About the only thing that can go wrong internally is the diaphram could tear/leak or the the spring setup would get dislodged or something. A leaky diaphram would make the pressure higher I think (if I'm thinking about it right), something to do w/ the spring/jam nut setup is all I can think of that might lower pressure.

I suppose the plugs in the extra ports could be leaking a bit after some time has passed etc. Mine did that, had to torque em down real good w/ some locktite.

But to directly answer your question no, I haven't any such problem w/ my Mallory regulator. Pump problems would be my guess.

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Ray87Z
-Vortec headed 350.
86 IROC w/ a cammed 305 TPI.
Formerly Ray86IROC.
www.inter-scape.com/Ray

well so far I've ranged from 3-12 on start ups where it has been set on 7. I can only imagine what it is doing while I'm driving. The fuel pump is old, so I guess that will be the plan of action. I remember hearing people running an in-line electric pump through the existing disengaged stock pump, anyone point me in the right direction?? thanks

I recently installed the mallory fuel regulator in the switch from TBI to Carb. Once the initial leaks were fixed no more leakage. Pressure is set to 6.5 psi. IF I start to have problems I'll let you know.

My regulator wont keep the same pressure. It goes from 4-10 psi and the adjusting nut is not moving. Im looking at a inline pump

I've heard of similar problems before with that reg. The BG was better, but still gave me some problems. Pressure would drop as the car gor warm...so I had to set it almost TOO high at idle and startup. The stock pump may have been the problem..I don't know. I got rid of them both and did an elecric inline from summit.

I too have heard of pulling through the stock pump..however..it WOULD NOT work for me. I had to drop the tank, take out the pump and put in a pickup.

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"American made baby. 100% American iron. The muscle among the masses. My hero. Yep, you can take your ergonomically designed, space age, computer controlled, 4 door, cup holding map lighted split double wishbone split fold down retractable cargo covered moon roof piece of transportation and keep it. For I have felt the thunder. And I know the difference!"
JSP Motorsports
ICON Motorsports

[This message has been edited by Jester (edited April 22, 2001).]

I have the mallory and at first it wouldn't hold a steady pressure and then I cranked the nut and it was fine.

Jester what year is your car? My 1983 CFI-car wouldn't let any fuel by the pump either.

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I WOULD RATHER PUSH A CAMARO THAN DRIVE AN IMPORT

1983Z28 350w/ edelbrock performer RPM power package with 64cc aluminum heads, dynomax shorty headers, 700R-4 with shift kit, 750cfm carb, edelbrock 3" exhaust system, ASCD SS hood, 16" IROC rims.

future mods:
completely done over suspension, black paint with flames, Hurst shifter, dakota digital gauge package, procharger supercharger.

super83z

What do you mean you cranked the Nut?

Damn, this is an old post that someone dug up, lol.

I still have not had any problems w/ my Mallory regulator.

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Ray87Z
-Vortec headed 350.
86 IROC w/ a cammed 305 TPI.
Formerly Ray86IROC.
www.inter-scape.com/Ray

It's a 90, was a 305TBI.