do i need the return line for a carb'ed motor
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Member
Joined: Sep 2002
Posts: 128
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From: Wyoming, Mi
Car: 89 Camaro RS Convertible
Engine: 355 chevy power
Transmission: 5 speed manual
Axle/Gears: standard
do i need the return line for a carb'ed motor
Just as the sub says i have a 350 in my 89 camaro. nothing special b ored .30 over and whatnot .488 lift comp cam. but im trying to figure out if i need the return line for the fuel pump. can i cap it off? will it make my engine run like crap? im not planning on using it any time soon..and it made my regulator run at 3psi instead of 6 when i had the return line hooked up and i couldnt change the psi
Supreme Member
Joined: Sep 2002
Posts: 9,192
Likes: 19
From: Cary, North Carolina
Car: 1992 RS
Engine: Carbed 350
Transmission: 700R4
Axle/Gears: 3.42 posi
Re: do i need the return line for a carb'ed motor
If using the in tank fuel pump, you HAVE to use the return line, and use a return-style fuel pressure regulator like the Mallory 4309.
Senior Member
Joined: Mar 2002
Posts: 522
Likes: 9
From: Sunset, Utah
Engine: None
Transmission: None
Re: do i need the return line for a carb'ed motor
If you're running the original pump for fuel injection then you do need a return otherwise your pump will burn out. Depending on what injection style you had it would be around the 30 psi mark but a carb only needs about 5-9 psi depending on your setup.
Joined: Mar 2000
Posts: 43,187
Likes: 42
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
What regulator were you using? How did you have the return set up?
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theshackle
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Mar 5, 2017 06:37 PM
