General Category > Quadrajet Carb Talk and Tips

Do Q-jets require a fuel return?

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markedmondson:
This question came up on the NCRS Forum.

A member wants to use a Q-jet and spread bore manifold on a crate small block in a '63 Corvette.

Most cars I've seen originally equipped with a Q-jet have a fuel return line, either from the pump or from an in-line fuel filter. 

Does this mean a fuel return is needed by the Q-jet?  Maybe to provide proper volume or pressure? Or is this not a concern? 

It's a question for this swap because '63 Corvettes are not plumbed with a fuel return.

Thanks.

carmantx:
We haven't used a return line on our personal cars we have built for Quadrajet use.

Ethan1:

--- Quote from: carmantx on March 19, 2017, 08:54:01 PM ---We haven't used a return line on our personal cars we have built for Quadrajet use.

--- End quote ---

 Neither have I.

Cliff Ruggles:
Factory fuel return lines were used for A/C cars with Q-jets, but there are exceptions to that.

It's never a bad idea to use a return line, even though many set-ups work fine "dead head".

I use a return line with my set-up, sumped tank, high flow Marine spin on filter assembly, Mallory 140gph electric pump, 8an lines fittings everyplace to a return regulator just in front of the Q-jet.

I tried that deal "dead head" and it worked fine, but the pump burned up the brushes in about 2 months of use.  Installed the return system and nearly 20 years later the pump is fine after the new brush install.......Cliff

markedmondson:
Thanks guys; I appreciate the help.

I posted a link to this thread on the NCRS Forum as an answer the member's question.

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