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diesel fuel leak

Discussion in '1982-Present GM Diesel' started by 6.2L Jimmy, Feb 2, 2002.

  1. 6.2L Jimmy

    6.2L Jimmy 1/2 ton status

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    Hi Everybody.

    Wierd one, on a model 80 fuel filter system looking from the front of the truck the fuel filter base plate which mates to the fuel filter is leaking from a wierd place. Just above the upper most fuel line inlet on the side of the base plate there is a hole cast in the base plate and I am leaking from there. Does anybody have any Ideas or has this happened to anybody else?
    Thanks
    Mike

    1989 GMC Jimmy 6.2L 4x4,1969 Camaro Z/28 502 C.I. B.B.C.
    BLOOD,SWEAT AND GEARS!
     
  2. DieselDan

    DieselDan 1/2 ton status

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    OK I'll bite. Model 80? Are you referring to the "box" style filter? I never heard it called that, before. If it is the box they are noted for having a leak (usually just air) at the pressure sender that tells the driver when the filter is clogged. The GM bulletin fix for this is remove the sender, tap it NPT, and screw in a pipe plug. Presto no sender/no leaks.

    Real trucks don't have spark plugs!
     
  3. 6.2L Jimmy

    6.2L Jimmy 1/2 ton status

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    Hey all,

    Well I changer the fuel filter block and all is well now.
    Thanks for the help.

    Mike

    1989 GMC Jimmy 6.2L 4x4,1969 Camaro Z/28 502 C.I. B.B.C.
    BLOOD,SWEAT AND GEARS!
     
  4. knudel

    knudel Registered Member

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    Maybe dumb question... what is NPT? I'm having the same issue- it seems to be the round thing with foam over it. the foam fell off, it's for 2 rectangular holes in the round things and 2 wires coming out. so... jb weld the holes, or how does it come out to tap and plug it?
     
  5. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    National Pipe Thread...

    Rene
     
  6. knudel

    knudel Registered Member

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    Aha!! And what is that? Grin
     
  7. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Pipe is measured by it's inside diameter. So 1" pipe would near to 1.375" outside diameter and 1" NPT would be near to 1.300". So pipe threads are commonly much larger than you'd think.

    There is also a tapered pipe thread...which is tapered if you can believe it/forums/images/graemlins/grin.gif

    Rene
     

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