Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Verifying Fuel Pressure on '71 Pontiac 455HO Quadrajet

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Cliff Ruggles:
Good information on the pump still being available and that it corrected the pressure fluctuation issues.

We get a LOT of complaints to the shop these days from folks who have just purchased new mechanical fuel pumps that are not working correctly and causing flooding.  Not uncommon for folks to report seeing 12 psi or more from some of these "new" pumps.

I suspect that most or all of these pumps are imported.....Cliff

olemansmith:
I suspect this one is offshore too Cliff. Carter used to be proud enough to have their name embossed on the side of the pump. The one I got (and I'm glad it works) has nothing any where except some tiny little production numbers stamped on the bolt up flange to identify what it is. Other than that, it is a "slickity no name". I read a dozen or more reviews on the Summit site with guys sending them back because they have too much pressure. I had to bite the bullet and get one knowing I may have to add a regulator. What are you going to do? Can't buy an old stock pump that was made long before ethanol gas was here. Things change, I keep the tank as close to full as I can before I park it. I started using Joe Gibbs Driven Carb Defender fuel treatment a good while back.. I haven't saw any degradation to any fuel components. Anybody else doing this?

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