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Thread: Fuel Filter Head In/Out Thread Sizes

  1. #1
    Join Date
    Aug 2019
    Location
    Joliet, Illinois
    Posts
    29

    Default Fuel Filter Head In/Out Thread Sizes

    I'm doing a little plumbing under the hood and I'm trying to find out what size/thread the fuel in/out fittings are on the spin on filter head.

    Also the fittings on the filter on the back of the head.

    Last time I did this kind of thing was on a 7.3 IDI filter head. After a month of trial and error I finally asked on a forum and was informed by EVERYBODY that it was a proprietary fitting that I has to get from International.

    It was one of those things that everybody just knew. Except me.

    So this time I thought I'd forego the month of trial and error and just ask right away. fuel filter.jpgfuel filter.jpg
    1983 Chevrolet C20

    1923ish Ford Model T Touring

    2000 Lincoln Town Car

  2. #2
    Join Date
    Dec 2003
    Location
    Yukon Canada
    Posts
    1,612

    Default

    I am pretty sure they are NPT fittings.
    I have never come across any propriety fittings on a GM yet
    90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews

  3. #3
    Join Date
    Oct 2001
    Location
    Granby, Missouri, USA
    Posts
    3,081

    Default

    It's been quite a few years since I've messed with one of those filter assemblies, but if I recall correctly, they are flared fittings (like brake lines), and one size is larger than the other. Sorry, I'm not much more help than that.

    Casey
    1995 K1500 Tahoe 2 door, 6.5LTD, 4L80E, NP241, 3.42's, 285/75R16 BFG K02's; 1997 506 block; Kennedy OPS harness, gauges, Quick Heat plugs, and TD-Max chip; Dtech FSD on FSD Cooler; vacuum pump deleted, HX35 turbo, Turbo Master, 3.5" Kennedy exhaust, F code intake; dual t/stats, HO water pump, Champion radiator; Racor fuel filter

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