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  1. #11
    Heavy Load Member SmokinCAT's Avatar
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    Quote Originally Posted by dairyman View Post
    Thanks SmokinCAT,that is kinda what the old girl sounds like when i am in a hard pull.Do you remember loosing prime when you shut 'er down,mine runs ok after i hand prime it,but as soon as i shut 'er back down,it will loose prime again?
    No, I never did have any trouble with it loosing prime, and now I run an electric pump to keep up with the pressure and flow I needed. Since it is still doing it you might look over your fuel lines, check all your fittings. I think les is probably right though, I'd say a check valve has went bad some where in the system.



    If your worried about the pressure go buy a cheap mechanical pressure gauge, oil will be the most common type, there should be a plug on top of your factory fuel filter base, that's where you will want to check your pressure, you should have no less than 40psi under power.

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  3. #12
    Bobtail Member
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    My b model is acting up in a similar fashion. Doing everything yours is but isn't loosing prime. I've changed filters replaced the main fuel lines with no avail. I've got 40 psi idiling I was leaning towards the lift pump but w that pressure I'm stumped. I'm going to check my check valves this afternoon. My fuel/water seperator is dry also, you can take it off the truck and it continues to run fine. Good luck with your trouble shooting, Im looking forward to seeing the end result.

  4. #13
    Medium Load Member
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    i didn't think a 3406b had a check valve just a # 4 fitting on the return i guess there is a check valve in the lift pump sounds like a loose fitting to me

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