General Category > Quadrajet Carb Talk and Tips

Do Q-jets require a fuel return?

<< < (3/3)

markedmondson:
For OEM designs I've seen on GM cars, the fuel return line is smaller than the supply line.

Schurkey:

--- Quote from: markedmondson on November 05, 2017, 10:04:26 AM ---For OEM designs I've seen on GM cars, the fuel return line is smaller than the supply line.

--- End quote ---
5/16 or 3/8 fuel supply tubing, 1/4" vapor return.  The vapor system is typically restricted to about .060 in the fuel pump.  Actual vapor passes easily, but it acts like a carb jet for liquid fuel.

It's been a LONG time since I've seen the fuel filters built to connect the vapor return tube to.  I think they're also restricted on the vapor outlet.

blazer74:
I run the filter with the vapor port up close to the carb. otherwise I have vapor lock issues.
Wix 33041 3/8 in/out with 1/4 vapor port. Has a .060 orifice.
There's a 5/16 in/out version also.
I have not tried the pump with the vapor port.

markedmondson:
Does someone make an in-line filter with a bypass that screws directly into the carb's inlet?  With the steel line attached to the other end, this would avoid any rubber hose on the pressure side.

I saw a car for sale on eBay awhile ago with a filter like this, but without the bypass.  It stuck out about 3" from the Q-Jet's inlet with the steel supply line directly attached to the filter's inlet. It was a Chevy with the inlet pointed to the right.  Haven't seen that before.

Navigation

[0] Message Index

[*] Previous page