Possible to fit 3/8" return line?
Thread Starter
Joined: Jul 2005
Posts: 459
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From: Bloomingdale, NJ
Car: 1985 Z28
Engine: 350
Transmission: T-5 5 Spd
Axle/Gears: Built 10bolt w/3.73s
Possible to fit 3/8" return line?
I'm going to be replacing my fuel lines and installing an electric fuel pump and bypass regulator in near future. I know these things like having a big return line. Is it possible to order 2 prebent feed lines and use one for a return using OE brackets?
Joined: Mar 2000
Posts: 43,187
Likes: 45
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
The OE clamps are sized for stacked 3/8" & 5/16" tubes.
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Joined: Oct 2007
Posts: 1,881
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From: Fl.
Car: 83 Trans Am / 96 Jeep XJ
Engine: 355 / 4.0 I6
Transmission: TH350 / Auto
Axle/Gears: 3.23 10-bolt / 4wd
Re: Possible to fit 3/8" return line?
Yes, that would be possible, but the line on the sender itself is 5/16" as well. You would have to modify the sender.
Supreme Member
Joined: Sep 2002
Posts: 9,192
Likes: 20
From: Cary, North Carolina
Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi
Re: Possible to fit 3/8" return line?
If you were reading my posts about having problems with the mallory 4309 and the stock return lines, don't worry - I found my issue and it had nothing to do with the 5/16 return line size - I'm running fine now and have no problems getting the 4309 to adjust down as low as 3psi from my TBI pump.
Thread Starter
Joined: Jul 2005
Posts: 459
Likes: 0
From: Bloomingdale, NJ
Car: 1985 Z28
Engine: 350
Transmission: T-5 5 Spd
Axle/Gears: Built 10bolt w/3.73s
Re: Possible to fit 3/8" return line?
Hey Camaronewbie what pump are you running? If I'm going to drop the tank I wanna do it right and drop in a Walbro 255 so I won't run out of fuel with future upgrades, but I wanna make sure it won't over power the 5/16" return.
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