OK brain dead on carb install

[Clem Z.]

Re: OK brain dead on carb install

Has anyone with the C-3 series Vettes having fuel return lines had an excessive bypass problem??

I had not had experience with these emission type controls, i.e. charcoal canisters and bypass fuel return lines, etc. as I was out of the country during that era. My first experience came with a new 83 Camaro Z-28 H.O.. Upon hard acceleration, the thing would fall flat as it seemed to be running out of fuel. I checked with the dealer and they knew nothing. In trouble shooting the problem, I used a fuel hose from the pump to the carb with a clear filter and discovered the line would run dry during WOT bursts. I traced the system lines and figured out that too much fuel was by-passing in the pump back to the tank. To overcome or limit this, I inserted a restrictor using a Holley main jet and threaded it into the return fuel hose far enough to allow connection back on the pump fitting. It worked like a champ.

I recalled this just this past week as I was looking for a good section of hose to replace a piece on my lawn mower. The piece I found in my parts bin was about 1-1/2" too long. When I cut it down - there was that jet inside some 27 years later.

Several months after I had made my modification, I read about the same fix in a magazine. Darn!, I could have written the article.

Stu Fox

another advantage to the return line fuel pump is if you find yourself with a failing fuel pump do to low pressure just clamp off the return line to raise the fuel pressure

[Dennis S.]

Re: OK brain dead on carb install

You'll also need a bracket which fastens the filter to the AIR pump bracket.

Joe
I don't believe the '68 or '69 big block uses a filter bracket. The AIM for '69 shows it on the small block, but not on the L36. I know the TIM & JG says it should be there, but I and many others have tried to install it and there is no way to make it fit. My Paragon repro is sitting in my spare parts box, as are many others I have read about on other threads.