I have a '67 camaro and I was looking at putting Retrotek BOSS EFI on my LS364. However the EFI system recommends a fuel return line for motors over 500hp. My fuel tank and sending unit are stock '67 parts and are brand new. I do not have an option with my sending unit for a return line. Does a '69 sending unit have a return line? Can I self tap a return line directly into the tank? Since the tank is brand new I don't want to change it for an after market. I would like to work with it.
If anybody has come across this or has any suggestions please let me know.
Have you put fuel in the tank yet? If not you could weld a AN bung to the tank for a return line. Also I have heard of guys tapping the return line back in at the tank end of the fuel line...but it's best to dunp the fuel back into the tank.
I modified my stock fuel sender/pickup by drilling a 3/8" hole in the mounting flange right next to the pickup. I then worked a 3/8" line through the hole, bent it to match the bend of the pickup giving it enough length to return the fuel into the tank about the same height as the pickup tube. On the top side, I bent it to match the 3/8" pickup line around right next to the pickup hose fitting. It has worked well for me so far. I used small stainless fuel line clamps to hold it in place and JB Weld to seal up the hole. Since it was a 3/8" hole, it was a really tight fit, so it didn't take much JB Weld to seal it up.
Hope this helps...
GeoffP
68 Camaro LT1/T56 4.10 (soon to have 4 wheel Wilwood brakes!)
87 Camaro IROC-Z LT1/4L60E 3.23
I'm doing what Geoff did, The brazing job I had done didn't seal totally, recomend you fill the recess in the sender cap with liquid epoxy to ensure a leak free install.
I had right stuff detailing make me a 3/8" return line from the same pattern as the stock 1/4" vapor return line, that way they fit nice side by side.
Make sure the supply and return are the same size.
In a previous install, I used the 1/4" vapor line as a return, reg couldn't dump enough fuel, idle was stinky rich.
To fix that, I tee'd the return into the pump inlet. That worked "ok" unless I ran it out of gas. Pump won't prime from out of gas though, was a big problem for me twice.
A cheap alternative is to get a stainless steel tank form classic ind. Them get pump, housing and sending unit from tanks inc. Cut the area where the sending unit was and weld close out panel for new pump and sending unit. my headaches are gone since, This is supporting enough fuel for my sbc tt camaro at 680 rwh 760 rwtq.
Sorry do not know how to make this links work, will have to type them or copy and paste.
i have ran a brazed line and it broke loose twice in 5 years i welded it it lasted 3 i said f it and jbwelded it .that lasted 1year .. i now run a&n fittings through the tank if youre sender is one layer of metal thats the way to go but if not put it in the tank within reach to sending hole so it can be tightned ..any how performance clinic hooked me up with a 90 fitting and a metal /rubber seal then inside i used a nut over a flaired line to drop it down to the bottom of the tank with a 90 at the lower end its importaint that you redirect the return away from the pickup to prevent aereation this is on a daily driver and verry easy to do i wish i had figured this out in the begining lol its the way to go for long term
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Fuel return line ideas for '67 camaro
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