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Thread: what size are the fuel lines????

  1. #1

    what size are the fuel lines????

    what size are the lines on the fuel rails on a 2001 6.0 (fittings)

    and what size are the under chassis feed and return fittings at the filter (98 suburban)


    i am doing a 6.0 swap to a 98 obs and need to adapt the fuel lines

  2. #2
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    5/16 and 3/8
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  3. #3
    5/16 on the rails and 3/8 ar the filter? do you know if the threads are NPT or not?

  4. #4
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    The fittings are 3/8" on the pressure side and 5/16" on the return side. The fittings on the filter should be straight thread but I'm unsure of what size they are since I always toss the truck filter in favor of a Corvette internally regulated filter for a single line fuel rail.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  5. #5
    ok thanks

  6. #6
    Join Date
    May 2007
    Location
    Las Vegas, NV
    Posts
    83
    The filter fittings are metric o-ring 14mm x 1.5

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