Installing EFI with fuel return lines - gas tank?

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    Author Topic: Installing EFI with fuel return lines - gas tank?  (Read 1690 times)

    Offline andben

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    Installing EFI with fuel return lines - gas tank?
    « on: November 25, 2014 - 02:25:38 PM »
    Guys, I got a stock gas tank in my 71 Cuda with a 440. I'm about to install Holley Terminator EFI (550-405 and 526-4 kits) and looking how to install the fuel return line to the tank. Is there a sending unit with a "return" inlet? Or do I need to build something for myself? Read that someone modified the filler tube to "return" the gas to the tank when using EFI.

    cheers!


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    Offline anlauto

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    Re: Installing EFI with fuel return lines - gas tank?
    « Reply #1 on: November 25, 2014 - 02:40:08 PM »
    I just went through this. I bought a sending unit for a 440+6/Hemi which has a 3/8 feed and a 1/4 return. Then I replaced the 1/4 return with a 5/16 tube that ran further into the tank. I bought two, one of each size, pre-bent MAIN FUEL lines and ran them side by side. :2cents:
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    Offline andben

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    Re: Installing EFI with fuel return lines - gas tank?
    « Reply #2 on: November 25, 2014 - 04:25:54 PM »
    Quote from: anlauto on November 25, 2014 - 02:40:08 PM
    I just went through this. I bought a sending unit for a 440+6/Hemi which has a 3/8 feed and a 1/4 return. Then I replaced the 1/4 return with a 5/16 tube that ran further into the tank. I bought two, one of each size, pre-bent MAIN FUEL lines and ran them side by side. :2cents:

    Yea! Nice! Thats the way to go! I will run rubber hoses including in the kit for return as well as primary. They are 3/8 I think so I need to do some small modifications anyway.

    Where did you find that sending unit for hemi?
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    Offline ShelbyDogg

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    Re: Installing EFI with fuel return lines - gas tank?
    « Reply #3 on: November 25, 2014 - 09:38:05 PM »
    Vans has the pickup with the 3/8 pickup and 1/4 return. There is also a 1/2" pickup available.

    For mine, I drilled out the 1/4" tube and soldered in a 5/16 tube. Another common way is to put a nipple into the fill tube and let it dump back in that way.

    Without a sump, I always remember to fill up at 1/4 tank.  This isn't always a problem since my MPG has gone way up.
    « Last Edit: November 25, 2014 - 09:41:45 PM by ShelbyDogg »
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    Rob

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    Offline 67vertman

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    Re: Installing EFI with fuel return lines - gas tank?
    « Reply #4 on: November 25, 2014 - 10:58:12 PM »
    Quote from: anlauto on November 25, 2014 - 02:40:08 PM
    I just went through this. I bought a sending unit for a 440+6/Hemi which has a 3/8 feed and a 1/4 return. Then I replaced the 1/4 return with a 5/16 tube that ran further into the tank. I bought two, one of each size, pre-bent MAIN FUEL lines and ran them side by side. :2cents:

     :iagree:

    Except I bent my own lines.  Two years (I have a 440+6) in and no issues what so ever.  I run 48 lbs of fuel pressure.  No starvation and no return issues.
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    Ron - Born and raised in Southern California

    I got the 1970 Cuda, but still need the hot blonde to ride shotgun!

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    Offline 360FISH

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    Re: Installing EFI with fuel return lines - gas tank?
    « Reply #5 on: November 26, 2014 - 01:18:32 AM »
    Something to consider...
    I originally did the return line when I setup my FAST EZ EFI system... mounted the pump near the fuel tank (behind the rear seat)...  the pump was a "quiet" walbro...
    A year later I switched to the eddelbrock fuel sump to get rid of the noisy fuel pump...
    I don't need a return line (or extra fuel pump or pressure regulator) and have had no issues.

     :2cents:
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    1973 ‘Cuda   Semi-Pro Touring
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