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#1 |
Registered User
Join Date: May 2002
Location: Woodstock, GA USA
Posts: 300
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Fuel Line Help
I am putting in new lines for brakes and fuel to a rear mounted gas tank. The pre-bent line kit I ordered from Inline Tube only has one fuel line. Does this mean that I don't need a return line? The motor will be a ZZ502 with an electronic fuel pump.
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Bill Durham http://home.attbi.com/~bulldurham 72 Cheyenne Restoration in progress Currently: frame sand blasted and powdercoated, Inline Tube brake and fuel lines, Blazer tank in rear, Holley Red electronic fuel pump, Eaton posi with 3.42 gears, 2 1/2" drop front spindles, 4" drop rear springs with adjustable panhard bar, KYB shocks, ZZ 502/502 GM Performance crate engine, Zoops brackets and pulleys, Vintage Air, dual electric fans, Ram Air II hood and late model sport side bed. |
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#2 |
Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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If I understand correctly, the fuel pump will be in the tank and supply a fuel injected motor. If that is the case you will need a return line for all of the systems that I am aware of.
If it is a carbureted engine, with no AC and you are using an electric fuel pump, then you probably don't need a return line. Jim Last edited by JimKshortstep4x4; 10-30-2002 at 02:46 PM. |
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#3 |
Registered User
Join Date: Jul 2002
Location: California central coast
Posts: 126
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There exist returnless EFI fuel systems, but they are rare and all the examples I've seen are relatively new. Like the Chrysler 3.2L V6.
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#4 |
Registered User
Join Date: May 2002
Location: Woodstock, GA USA
Posts: 300
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The motor is carbureted and the fuel pump will be in line and not in the tank. What does AC have to do wiith the fuel line. It will have an afternmarket Vintage Air system.
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Bill Durham http://home.attbi.com/~bulldurham 72 Cheyenne Restoration in progress Currently: frame sand blasted and powdercoated, Inline Tube brake and fuel lines, Blazer tank in rear, Holley Red electronic fuel pump, Eaton posi with 3.42 gears, 2 1/2" drop front spindles, 4" drop rear springs with adjustable panhard bar, KYB shocks, ZZ 502/502 GM Performance crate engine, Zoops brackets and pulleys, Vintage Air, dual electric fans, Ram Air II hood and late model sport side bed. |
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#5 |
Registered User
Join Date: May 2000
Location: Alexandria, LA 71301
Posts: 1,451
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yea, please enlighten us. i don't understand the a/c issue either. i'd also like to know any info about return-less efi.
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-02 avalanche (daily driver) -66 gto ragtop 389/400 (garage queen, hand-me-down from dad) -72 Tribute Trans Am (6.0LS/T56 6-speed) in progress -2003 YUKON (Wife's) -71 gmc swb fleet (current project, gonna shave everything, bags, stuff w/ 20's, gen III powertrain) -48 3100 SWB - 12/31/23 LONG TERM Project |
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#6 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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there are a few cars that dont have a return line. one that is fresh in my head right now is actually the newer escort. i dunno how they do but it works just fine. i guess the pumps themselves are regulated to a specific pressure controlled by the computer or somethin. this is just a guess i honestly have no idea how it works
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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#7 |
Registered User
Join Date: May 2000
Location: Alexandria, LA 71301
Posts: 1,451
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an aftermarket or adaptable return-less efi system sure would make rod building easier and do away with a few headaches.
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-02 avalanche (daily driver) -66 gto ragtop 389/400 (garage queen, hand-me-down from dad) -72 Tribute Trans Am (6.0LS/T56 6-speed) in progress -2003 YUKON (Wife's) -71 gmc swb fleet (current project, gonna shave everything, bags, stuff w/ 20's, gen III powertrain) -48 3100 SWB - 12/31/23 LONG TERM Project |
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#8 |
Account Suspended
Join Date: May 2002
Location: Olathe, Kansas
Posts: 929
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Chrysler is huge on this idea.. have been since early '95 on anything from the 2.0L DOHC to the 3.8L.
Your exactly right Cableguy, the pcm modulates the pressure by varying the frequency signal to the pump. Ford also uses a single line but they have a fuel pressure sensor on the rail. As long as your staying within reason on your inline pump, you do not need to run a regulator return line. Even if you run something like a Holley "Blue" pump, it doesn't require a return line but you definatly will have to use a regulator. The main problem I see with running this type of system on a peformance vehicle is fuel temp. The return line serves 2 purposes. 1: Allow the pump to run at the pressure it was designed for, no more no less. "Dead head" pressure is what usually takes a pump out. Plugged fuel filter would be a good example. 2: supply a constant "Cool" fuel charge to the injectors at all times. Fuel is not allowed to simply sit in the fuel rail and vaporize. Last edited by Zkast; 10-30-2002 at 11:38 PM. |
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