DD60 Refusing to start, fuel entry issues.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by DetroitS60, Jan 23, 2021.

  1. DetroitS60

    DetroitS60 Bobtail Member

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    May 12, 2020
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    Hello,

    So I have a truck that's been giving me non-stop fuel problems. The main issue is that the engine stalls out if the truck has been sitting for an extended period of time because fuel is running out in the primary fuel filter, despite the truck having a ton of fuel. I keep getting told there is air in the system but I'm not sure how to suck the air out or prime the engine without using ether, as I already used a lot the previous year. Any ideas?
     
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  3. blairandgretchen

    blairandgretchen Road Train Member

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    Check valve - behind the ECM?
     
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  4. Old Man

    Old Man Road Train Member

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    There is a check valve in the fuel return, on line from back of head.
    Something is letting fuel siphon back into tanks.
    Try turning off the valve by the fuel filter as soon as you shut it off, see if it helped,
    The check valve is less than $100, I would change it, very simple if you can reach it.
     
  5. Hulld

    Hulld Road Train Member

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    There is also a check valve at the inlet of the Davco filter housing that can be problematic if it has that set up?
     
  6. Rideandrepair

    Rideandrepair Road Train Member

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    Never heard of that.
     
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  7. blairandgretchen

    blairandgretchen Road Train Member

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    Sorry - am I thinking of N14.

    S60 is at the back of the head?

    I best just see myself out. I’m trying to remember all the issues my buddy had between a S60 and N14 fuel issues with neglected tore up trucks!
     
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  8. Rideandrepair

    Rideandrepair Road Train Member

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    Old man posted a diagram. As far as I know, the fuel pump has on built in. Might be one on the fuel tank shutoff valve, but I think it’s more of an equalizer valve.
     
  9. Rideandrepair

    Rideandrepair Road Train Member

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    The only way I know of, to check for sucking air, is to pressurize tanks, and check lines for leaking. I need to do mine, since I have tell tale bubbles in tanks. They also use temporary clear hoses to see air in lines, under operation. I’ve never done either. But suspect My shutoff valve is sucking air.
     
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