I need to buy a new fuel pump for my 67 Firebird , the old pump had either a vent or return line in it. During restoration I put a new tank unit in it and it only has the feed line. My question is does anybody know if I can buy the 67 pump and plug the small line or what application used only one line so I can purchase that one?
The return line coming from the pump isn't a vent for the tank. It connects to the sending unit assembly on the top of the gas tank. If you used the same sending unit you had before the tank change you should still have the tube to connect the return line to. You can buy a pump for a 350 car(w/o ac). It doesn't have the return line but it may not be big enough to feed your 400. Depends on how you drive.
It wouldn't on mine. Every car is different but that was my experience. I went electric. Problem solved. Ive heard some people plug the return port coming out of the mech pump but some say it's dangerous if the diaphram were to break and fill the crankcase with gas. Might be an urban legend. Never heard of it happening. Not sure it's worth the risk when there are better options.
If you still have the dual fuel lines in place under the car, you could consider dropping the tank and putting in the dual line fuel sending unit. Rick's Camaros sells them.
I have also found a site that sells aftermarket high volume mechanical fuel pumps for Pontiacs that come with or without the vent line nipple.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI
