3-line or 2-line fuel pump... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

COACHMEASON · 07-21-2009, 12:15 PM

This may be a dumb question here it goes...I just had a custom gas tank made and I DO NOT have a fuel pump on my small block...How do I know of I need a 3line or 2line? Thanks

6772owner · 07-21-2009, 12:52 PM

I assume you are referring to the mechanical pump, I believe that the third line was a return line to the tank on some models. I am not 100% sure of that, I would order the pump for the 72' and see what you get... I am betting it is just an inlet and outlet. Others will chime in hopefully.

COACHMEASON · 07-21-2009, 01:01 PM

It calls for either...

6772owner · 07-21-2009, 01:54 PM

Well that figures lol Ok well I guess Im no help to you.

My 72' had all the emissions system (charcoal canister) already unhooked and had been changed from I6 to SBC, so I never had to deal with this. Does on line possibly go to the charcoal canister to pull fumes?? Hopefully a guru will have the answer for you. Sorry I was of no help.

jondancer · 03-11-2013, 10:11 PM

Is it necessary to have a return line?
Posted via Mobile Device

07-21-2009, 12:15 PM	#1
COACHMEASON Keep On Keepin' On Join Date: Apr 2006 Location: Oklahoma Posts: 417	3-line or 2-line fuel pump... This may be a dumb question here it goes...I just had a custom gas tank made and I DO NOT have a fuel pump on my small block...How do I know of I need a 3line or 2line? Thanks __________________ 07 Avalanche Z71 92 Mustang 5.0 GT (Triple White w/ 53,000 miles) 72 SWB Chevy w/ PS, AC, 350/350 Current Project ....In paint shop getting body/paint work done (Corvette Velocity Yellow)... http://67-72chevytrucks.com/vboard/s...d.php?t=157669

07-21-2009, 12:52 PM	#2
6772owner Gearhead Join Date: Jan 2008 Location: Colorado Posts: 1,193	Re: 3-line or 2-line fuel pump... I assume you are referring to the mechanical pump, I believe that the third line was a return line to the tank on some models. I am not 100% sure of that, I would order the pump for the 72' and see what you get... I am betting it is just an inlet and outlet. Others will chime in hopefully. __________________ 2002 Saturn SL2, My D/D 2019 Ford Fusion SE, Ecoboost - Wife's D/D 1993 Camaro Z28, A4, CAI, Cat-Back Exhaust Project C10 (my 72' C10 w/96' LT1, 700R4, bagged F&R, 18's (for now), Short/Fleet) -- SOLD! Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=313644

07-21-2009, 01:01 PM	#3
COACHMEASON Keep On Keepin' On Join Date: Apr 2006 Location: Oklahoma Posts: 417	Re: 3-line or 2-line fuel pump... It calls for either... __________________ 07 Avalanche Z71 92 Mustang 5.0 GT (Triple White w/ 53,000 miles) 72 SWB Chevy w/ PS, AC, 350/350 Current Project ....In paint shop getting body/paint work done (Corvette Velocity Yellow)... http://67-72chevytrucks.com/vboard/s...d.php?t=157669

07-21-2009, 01:54 PM	#4
6772owner Gearhead Join Date: Jan 2008 Location: Colorado Posts: 1,193	Re: 3-line or 2-line fuel pump... Well that figures lol Ok well I guess Im no help to you. My 72' had all the emissions system (charcoal canister) already unhooked and had been changed from I6 to SBC, so I never had to deal with this. Does on line possibly go to the charcoal canister to pull fumes?? Hopefully a guru will have the answer for you. Sorry I was of no help. __________________ 2002 Saturn SL2, My D/D 2019 Ford Fusion SE, Ecoboost - Wife's D/D 1993 Camaro Z28, A4, CAI, Cat-Back Exhaust Project C10 (my 72' C10 w/96' LT1, 700R4, bagged F&R, 18's (for now), Short/Fleet) -- SOLD! Build Thread: http://67-72chevytrucks.com/vboard/s...d.php?t=313644 Last edited by 6772owner; 07-21-2009 at 01:55 PM. Reason: text

03-11-2013, 10:11 PM	#5
jondancer Registered User Join Date: Jul 2010 Location: central michigan Posts: 1,194	Re: 3-line or 2-line fuel pump... Is it necessary to have a return line? Posted via Mobile Device



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