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Thread: 5 ton fuel tank selector valve cleaning/rebuild

  1. #21
    Sergeant Major Excuse Me's Avatar
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    Ok, today on my M931 8.3L, I took the two bolts out that held the selector valve and pulled the valve down without removing the lines. I took a 13/16" box end and removed the top of the selector valve. Pulled the cartridge out and polished the shaft that hooks to the handle.

    Cleaned things up really good as there was some crustified fuel or installation lube at the threads. Installed new orings and put the valve back together. When I went to put the mounting bolts back in, I could not as the valve would not go up quite far enough. Turned out there is a bolt that holds the seat plate down that was too long and hitting the valve. I removed the bolt and shortened it. Then the valve went right back into the mount how it was supposed to. That bolt may have been part of the issue.

    After double checking all the lines, I got fuel to the lift pump using my hand held vacuum pump. Then reattached the line to the lift pump and bled the air out of the reast of the system and it fired off and so far, runs fine.

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  3. #22
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    Make SURE the FLAT WASHER on top of the canister is in the recess and IS flat, if not the canister WILL suck air though the top O-ring.
    Ron, AKA , FTF (FIVE TON FIXER), AKA KGR (kinder/gentler Ron)
    Gainesville, Ga.
    vietnam-1/66-8/68
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  4. #23
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    I went with the spin on. No regrets. Get the one with drain.

  5. #24
    General bigboy44's Avatar
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    Quote Originally Posted by crasheej View Post
    I went with the spin on. No regrets. Get the one with drain.
    Part # and Pics would help a lot.
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    "When citizens fear their goverment, you have tyranny; when the goverment fears it's citizens, you have freedom." (Thomas Jefferson)


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  6. #25
    4 Star General Csm Davis's Avatar
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    Quote Originally Posted by patracy View Post
    Wouldn't think that'd be wise. That pump is all the way up at the engine and having to suck through a real long straw already. Adding a schrader valve would impede flow drastically.
    Okay Drew you are not getting the picture the Schrader valve is to let air in or out of the system like a petcock, not inside the line for fuel flow. Also the only place I have seen them was on the bolt that holds the canister on. I wouldn't change out any of the petcocks for Schrader valves, a Schrader valve doesn't work well in a vacuum system they will let in air, that's what they are designed to do. If the system had positive pressure they would work well but it doesn't. This is true for all of the stock 250 powered trucks not sure about the 8.3 or multifuel trucks as I have heard they have in tank pumps.
    Jeff Davis
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  7. #26
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    I removed the fuel filter canister for the third time today and found the "square" metal washer was very warped. Then I found an old rotted O-Ring on the bolt behind the new O-Ring so I flattened the metal washer, removed the rotted O-Ring and installed the new O-Ring. I filled the canister with some filtered diesel fuel, installed it and +ZEUS+ started right up. I drove it 1200 feet over to my shop and on the way over, lost power and it stalled again! Dang!

    Waited about 5 minutes, said a novena as I was blocking my driveway with this huge 5 ton beast and it started right up again, purring like a new motor. Drove it over to my shop and I let it idle while I getting my wood stove going and then I heard it stall out again. I noticed that the petcock on the filter head was leaking a bit. So, over to the auto part store and I purchased a new petcock, installed it and the truck started right up, purring like a new motor, only to stall and die again once a put a load on it. So now I began to inspect all the fuel lines, did not see any apparent cracks or other defects. So I looked at the end of the vent tube which is attached to the intake and found it completely clogged with a spider nest, dust, dirt and who knows what. I ran I wire up the tube and a bunch of debris came tumbling out of the vent tube. So, now I am thinking I am home free. Started the truck, 1/2 turn it cranked right up only to stall again after about 3-5 minutes. I can only hazard a guess that my fuel filter is filling with fuel and once the engine starts, it runs the filter housing dry and stalls out. So now I guess I have to attack the fuel selector switch. Dang, this is so frustrating. I am almost tempted to bypass the selector switch and run a new line from the filter straight to the passenger side tank!!!
    Last edited by joesco; 02-04-2014 at 18:17.
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  8. #27
    4 Star General Csm Davis's Avatar
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    Joesco what truck are you working on? 931a0, 931a1, 931a2? Double check that the gasket on the canister is in place and that there's only one on there.
    Jeff Davis
    SGM G-4 NCOIC Mississippi State Guard
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  9. #28
    General joesco's Avatar
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    931 with a swap to SS tires and a cut down deuce bed. Thanks, gasket is good, only one and in place.
    Southern NH
    My former stable
    1953 M37 (Barn Fresh CT. Truck)
    1963 M37 (Tx Fire Dept Truck)
    1987 M998 Humvee (TN Truck)
    1969 Unimog 421 (Unkown)
    1967 Unimog 404 (French Fire Truck)
    1968 M715 (Diesel Repower)
    1970 M35A2 aka Brutus
    1986 M1008
    1992 Libby MEP-002A GenSet
    1985 M931 - Bobbed - ZEUS (Fort Devens Truck)

  10. #29
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    Check for air sucking at the tank fittings as well as the valve and EVERVTHING in between
    Ron, AKA , FTF (FIVE TON FIXER), AKA KGR (kinder/gentler Ron)
    Gainesville, Ga.
    vietnam-1/66-8/68
    "Technical Manuals are the path to Illumination...
    Download, Study Learn"---rlwm211
    POOR PLANNING or NOT READING TM on your part does NOT constitute a EMERGENCY on our part.
    RECOVERIES (to a point) WHERE EVER, 703-389-6705, 73m819@gmail.com
    73m819, tractor/wrecker AKA NO LONGER Wrecked Wrecker
    What ever else that can be drug home
    Neutered 6X6s (bobbers) = 10t wheel chocks
    Use CUCVs, a small step below BOBBERS as 5t wheel chocks
    GOD help the MV or LEGO world if I win the LOTTERY
    Long live BIG GREEN IRON

  11. #30
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    Make sure that your manual fuel shut off is opened all the way too.

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