Fuel lines for EFI?

Discussion in 'High Performance Modifications' started by grzewnicki, Aug 4, 2019.

  1. grzewnicki

    grzewnicki Veteran Member Lifetime Gold Member

    Messages:
    3,227
    Likes Received:
    86
    Joined:
    Dec 9, 2009
    Location:
    Gordon from Jacksonville Fl
    What is everyone using to run new supply and return lines for a EFI system. I bought the MSD Atomic EFI and A Tanks inc tank and wondering what is the best option? Trying to get everything together to knock this out during my 10 day vacation in Sept. Unbelievable that the tanks inc paper work came with no list of included parts, took me reading through the direction to realize I was missing the pickup sock for the pump. The MSD instructions say it includes fittings for the included fuel line but there was no fuel line included. I was looking at push lock type hoses. The Tank has a 1/4 NPT on the pump for supply and return and the MSD has -6AN fitting. Figuring 3/8 supply line but haven't read what size return is required. These are some pretty crappy directions for a bolt on system. Also do you have to run a regulator on a return system...something else I have to buy?
     
  2. Lars_2Gen

    Lars_2Gen Veteran Member

    Messages:
    563
    Likes Received:
    137
    Joined:
    Dec 29, 2017
    Location:
    Fullerton, CA
    Interested in the answer to this also. Planning on using the Holley in- tank returnless setup, and was thinking about using the factory hard line... but not sure how to go from the pump to the hard line and hard line to efi.
     
  3. Lowend

    Lowend Administrator. .a car, a man, a maraca. Staff Member Lifetime Gold Member

    Messages:
    14,917
    Likes Received:
    426
    Joined:
    Mar 25, 1999
    Location:
    San Jose, CA, USA
  4. BigBlock73

    BigBlock73 Veteran Member Lifetime Gold Member

    Messages:
    2,012
    Likes Received:
    56
    Joined:
    Jul 10, 2002
    Location:
    Accord,New York
  5. grzewnicki

    grzewnicki Veteran Member Lifetime Gold Member

    Messages:
    3,227
    Likes Received:
    86
    Joined:
    Dec 9, 2009
    Location:
    Gordon from Jacksonville Fl
    MSD says do not use hard line......hmmm. I got 1/4 NPT coming out of tank, gonna adapt to 6an then run to filter and find a 6an type filter, then to fuel injection unit. And same for return but have to plumb in regulator. Following MSD advice I'm looking at push lock type hose to do the whole run, but want quality stuff, see lots of Chinese crap out there. probably going to be another $300-$400 to plumb-filter and regulate. I'll have a spare $100 left when I am done, anyone want to come do the install for cool $100, plenty of beer in fridge!
     
  6. 73LT

    73LT Veteran Member

    Messages:
    277
    Likes Received:
    2
    Joined:
    Jun 9, 2002
    Location:
    PA, USA
    I used Earls Teflon core braided stainless steel line. It's the same type as used for flexible brake lines to the wheels. It comes in sizes up to at least 8AN. It is also suitable for power steering and transmission cooling lines. It is a little on the expensive side and the fittings are also expensive. It will last a long time.
     
  7. Lowend

    Lowend Administrator. .a car, a man, a maraca. Staff Member Lifetime Gold Member

    Messages:
    14,917
    Likes Received:
    426
    Joined:
    Mar 25, 1999
    Location:
    San Jose, CA, USA
    A lot of sanctioning bodies get nervous if you use more than a foot of "soft" fuel line.
    MSD probably wants you to use a braided line for the fuel tank connection to isolate vibration, a couple of inches of braided should do.
    Def use nylon or Teflon lined braided line. The conventional rubber stuff outgasses and makes the garage stink
     
  8. SRGN

    SRGN Veteran Member

    Messages:
    666
    Likes Received:
    221
    Joined:
    Feb 20, 2009
    Location:
    Central NJ
    PTFE AN lines. Size according to power level and fuel type, E85 needs a lot of volume. I've been using the Aeroquip stuff, but it's expensive. I have been meaning to find an alternative for my next build.
     
  9. 76z28

    76z28 Veteran Member

    Messages:
    1,969
    Likes Received:
    40
    Joined:
    Jun 29, 2009
    Location:
    bakersfield
    I used all hard line with a few areas of rubber for vibration.
     
  10. cadillac_al

    cadillac_al Veteran Member

    Messages:
    809
    Likes Received:
    75
    Joined:
    Apr 22, 2015
    Location:
    Maine
    What about the plastic fuel lines that GM has used for many years? Then you could make push lock hoses.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.