Hey guys. Using my bro's name, here. I have an 86 SC with the anemic LG4. I wanted to upgrade the stock fuel pump, using a Holley 12834. After researching I found that most people just plugged the fuel return line. Well since then I have had major problems with the carb starving, and stalling cause of no fuel flow. when i put a pressure guage on it read 6 psi. However, it will eradically lose pressure and I will see gas bubble into the filter. My question,has n e one else had this happen and what did you do to relieve the problem, I was also told that the return acts as an equalization tube, since is an almost sealed system. I kept it simple by plumbing the 3/8 tank line using 3/8 from pump to carb. Thanx in advance guys.

 

also, my mods go as...Free flowing exhaust, open element KnN, and I tweaked the 2ndaries on the carb. Thats all for the motor for now.

 

Quick simple fix:

Go get the gas filter for a 69 Chevelle SS396. It will have a 3/8" inverted flare at each end, and a 1/4" return fitting. Make fuel lines to connect from the fuel pump to the filter and filter to the carb, and hook the return line back up, to the filter.

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"So many Mustangs, so little time..."
ICON Motorsports

 

the return helps keep the fuel cool so it doesn't vapor lock. there is no advantage to not using the return.

 

If your pump doesn't have a return you don't have a lot of choice.

 

If you've got air bubbles getting into the fuel filter for more that a minute or so of running there's one simple answer: You're sucking in air BEFORE the fuel pump. There are several pieces of rubber fuel hose between the tank and the fuel pump. They could be getting old. Or somethign even weirder could be happening but you are sucking in air from somewhere.

 

Bubbles could also be formed by boiling gasoline (the bubbles on the bottom of a boiling pan of water are H2O, not air), but I agree with Damon.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. 2-1/2" cat-back, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 CC system w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker 2055 headers, 3" Catco cat & 3" catback, restalled TC, Spohn SFCs).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).