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Thread: 85 6.2 3spd 1/2 ton

  1. #1

    Default 85 6.2 3spd 1/2 ton

    Found what I thought to be a leaking injector on this truck. Of course driver's side right at the back near the firewall, steering linkage, brake booster, etc, you know the real easy one to get at (not) unless you are a contortionist!! Anyway, took injector out and down to the shop to test, said it was fine, no dribbles, no leaks, even at 2100 psi!! So leaking return line me thinks, replaced that on the side that runs to the next injector, seems fine, but looks like injector is still leaking. Changed the other side with short piece of hose and plugged it off like what was on there, but still leaking!! Very hard to see exactly where this is coming from. I took the short piece of line off and discovered a tear, cut it down and tried again, seemed to tear it again? Question: Is there a difference in which nipple goes to which line, like maybe I am blocking off the wrong side? or did I just get a bad chunk of line? or what have I missed? I tried teflon taping the threads on the fuel line feeding the injector thinking it was a supply issue, nope. Next????? dynamite?? and run for the hills?!?!?!? Please help!!

  2. #2
    Join Date
    Sep 2001
    Location
    Lubbock TX, USA
    Posts
    4,194

    Default

    If your return line is bursting, or cracking leading to it leaking again, it is probably a good idea to replace that section with a new piece of the fibre wrapped stuff.

    No in or out port on the return nipples, just two out, so it won't matter which side.

    It's possible you have a blocked fuel return somewhere causing excessive pressure in the return side.

    But could be bad hose too.

    I've also seen the line not seal to the injector causing a headache.

    Save the dynomite just yet...
    1982 C10 SCSWB 6.5TD, mods too extensive to list. (13.69 1/4 mile @94.6 MPH) RACE TRUCK
    1982 C10 SCSWB 6.2NA, 2.73 700
    1986 C10 SCLWB 6.2TD 3.73 700
    1989 V20 SUB 6.2NA, 3.73 400
    1994 G20 VAN 6.5NA, 3.42 60E
    1994 K20LD ECSWB 6.5TD, 3.42 80E
    1995 K20 SUB 6.5TD, Wrecked, ran into by stupid teen.
    1995 C3500HD DRW 6.5TD, 12' Flatbed 5.13 80E
    1995 C3500HD DRW 6.5TD, 18' Rollback Wrecker 4.63 80E
    1994 C20HD ECLWB 6.5TD 3.73 80E Wifes Truck.
    1995 C20LD ECSWB 6.5TD 3.73 80E
    1995 K20LD SCLWB 6.5TD 3.73 80E
    1996 K30 DRW 6.5TD 4.10 80E
    1997 C10 Tahoe 2Door 2WD 5.7L to 6.5 Conversion Underway

  3. #3

    Default

    Thanks for the advice, removed all return line from the truck and replaced it all with the fibre wrapped stuff. Worked like a charm, thought it was best to just replace it all before another leak was noticed 200 miles from nowhere. Happy motoring again!!! Still wish I could drop my RPM down a bit on the hwy but that will take a couple sacks of money so will just tough it out till then..LOL!!

  4. #4
    Join Date
    Nov 2007
    Posts
    273

    Default

    Hi, BBMan,

    Where did you get your fiber-wrapped hose?

    Thanks.

    Joe


    Quote Originally Posted by bigbossman26 View Post
    Thanks for the advice, removed all return line from the truck and replaced it all with the fibre wrapped stuff. Worked like a charm, thought it was best to just replace it all before another leak was noticed 200 miles from nowhere. Happy motoring again!!! Still wish I could drop my RPM down a bit on the hwy but that will take a couple sacks of money so will just tough it out till then..LOL!!
    ****WANTED BURNED OUT PMD/FSD MODULES FOR EXPERIMENT. ****

    1998 Silverado, 6.5TD, 210k, long bed. 1984 Chevy Customized Van, 6.2.
    1985 Mercedes-Benz SD, diesel, 220k
    1990 Ford, F-250, 7.3 liter, bad engine.
    Onan, 4 cyl. Diesel, Marine Generator.
    Onan, 4 cyl. Diesel, Stationary Generator.
    Onan, 4 cyl. Diesel, Air-cooled Engine.
    2 Briggs/Faryman Diesels to rebuild.

  5. #5

    Default

    I am in Prince Albert Saskatchewan Canada. The name of the place is called Lorway Diesel. 1-306-763-1800 Ask for Wayne, gave me a great deal. I can't imagine that he would have a problem shipping if needed.
    1985 GMC 1/2 ton 6.2 NA 3 spd. A/T overload suspension, bone stock otherwise. 1981 Pontiac Parisiene 4-door 5.7 diesel X 2. Many others not diesel powered.

  6. #6
    Join Date
    Nov 2007
    Posts
    273

    Default

    Thanks, BBman,

    I am in Texas so, I can probably get them cheaper sans shipping.

    Joe


    Quote Originally Posted by bigbossman26 View Post
    I am in Prince Albert Saskatchewan Canada. The name of the place is called Lorway Diesel. 1-306-763-1800 Ask for Wayne, gave me a great deal. I can't imagine that he would have a problem shipping if needed.
    ****WANTED BURNED OUT PMD/FSD MODULES FOR EXPERIMENT. ****

    1998 Silverado, 6.5TD, 210k, long bed. 1984 Chevy Customized Van, 6.2.
    1985 Mercedes-Benz SD, diesel, 220k
    1990 Ford, F-250, 7.3 liter, bad engine.
    Onan, 4 cyl. Diesel, Marine Generator.
    Onan, 4 cyl. Diesel, Stationary Generator.
    Onan, 4 cyl. Diesel, Air-cooled Engine.
    2 Briggs/Faryman Diesels to rebuild.

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