Fuel pump question
Thread Starter
Burning Brakes
Joined: Aug 2001
Posts: 1,002
Likes: 0
From: Bay City MI.
Fuel pump question
I am going to put a new fuel pump in my car, the old one quit. Question, the new Holley has only an "in" and "out" on the pump. The other pump had in and out plus the out for the return line back to the tank. I know I have asked this one before, but do I need to have that return line , and what is the purpose of it :confused:
Drifting
Joined: Dec 1999
Posts: 1,462
Likes: 1
From: Reno nevada
Re: Fuel pump question (467-Ratman)
Have you ever heard of vapor lock? well the return prevents heat soak starting problems. also the return makes for steady fuel pressure instead of the pump pulses bouncing a pressure gauge like in a none return system
Drifting
Joined: Dec 1999
Posts: 1,462
Likes: 1
From: Reno nevada
Re: Fuel pump question (467-Ratman)
I'm not up on everything. So I can't say if it's good or bad. But it seems like mine isn't either because when I open it up to put in gas on a hot summer day like today the tank vents off pressure. I have never had a problem in the 12+ years that I've owned this Vette. I'm using the stock return type pump. With a light weight pump rod because I rev it up every once in awhile.
Heel & Toe
Joined: Apr 2002
Posts: 22
Likes: 0
From: Madison WI
Re: Fuel pump question (467-Ratman)
Anybody else have ideas on if the Holley pump is ok with plugging off the vent tube to the tank?
the return line, but have had no problems whatsoever. Have fuel pressure gauge that shows a rock steady 9 psi. It
seems to feed my 383 quite well with a 780 cfm Holley.
Melting Slicks
Joined: Oct 2001
Posts: 2,065
Likes: 1,395
From: Halifax, Nova Scotia, Canada
Re: Fuel pump question (467-Ratman)
Seems like if you have a Holley carb, then blocking the return line will have no negative effects. Mainly due to the large fuel bowls on a Holley.
With a Qjet, and the return line blocked, you will almost always get a vapor lock problem. Qjets have a very small gas bowl compared to a Holley, and it is also central in the carb., less chance to cool.
With a Qjet, and the return line blocked, you will almost always get a vapor lock problem. Qjets have a very small gas bowl compared to a Holley, and it is also central in the carb., less chance to cool.
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Verdad Gallardo
Senior Member since 1492
Joined: Aug 2000
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From: Just because I'm paranoid doesn't mean people aren't out to get me...
St. Jude Donor '09
Re: Fuel pump question (467-Ratman)
When I bought my '70, Bubba had already removed the return line(either that or my '70 is an LT-1 in disguise). I replaced the pump with an LT-1 pump ($19) because I had no return line. I didn't like the look of the AC Delco pump so switched to a Chrome Holley and run a steady 8psi.
I have experienced no vapor lock problems with this setup.
I have experienced no vapor lock problems with this setup.