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Adjustable Fuel Pressure Regulator Question

garyc4

Member
Joined
Dec 12, 2012
Messages
11
Location
Leonardtown, MD
Corvette
1984 two-tone bronze
Making good progress bringing my 84 back to life. After rebuilding both TB's, installing a new 85 pump and new sending unit, replacing all rubber sections of fuel and return lines, flushing all lines with carb cleaner, converting to an adjustable pressure regulator, and installing a fuel pressure guage, we fired the car today and it ran nicely.

Now the question: When it first fired, pressure was at 8-9 lbs and tab was just about halfway up the slot in the regulator housing. I began adjusting pressure while engine was running, and it rose slowly until it reached 12 psi and went no further. I checked the tab again, and it was all the way at the top of the slot, with no further adjustment available. This was not what I expected.

Anyone have experience with this, and can offer observations or advice?

Also, the front injector had a nice spray pattern, but the rear had a poor pattern and after a few minutes developed a drip and was obviously restricted. I'l remove the rear injector and clean again. Any adice on home injector cleaning remedies appreciated. Thanks.
 

KANE

Moderator
Joined
Mar 2, 2002
Messages
3,244
Location
KY
Corvette
Dark Blue 1982 Trans Am(s): Polo Green 1995 MN6
Fuel pressure is in part a function of the overall output of the pump itself. :thumb

The OEM TBI pumps will crank out between 12 -15 PSI max. If you find you need more because of mods, you will need to go to a higher flowing fuel pump, like the 85 & up TPI cars had. I have about 20psi on my rail with an 85 Vette fuel pump.

Hope that helps other folks too...
 

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