Join Date: Aug 2016
Location: Minneapolis, MN USA
Re: Sniper Return line
By 78 the vent would have been part of the sending unit. You don't want to use it for a return because it runs into a small baffle at the very top of the sending unit. The return runs closer to the bottom so you are not spraying fuel.
I should go out and hook a pressure gauge on the return of mine which is 5/16 back to the tank then into the original 1/4 sender line. The number I remember is below 5 psi is good.
Sorry no Chevelle, 73 Cadillac Eldorado - Fairly stock low comp 500cid.
FiTech Go4 600 - Timing control via gutted 7 pin large cap HEI - Fuel RobbMc Powersurge with returns.
Previous system was Megasquirt w/Holley TBI so I am not new to DIY EFI