cat 3406b -fuel transfer pump problems?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by dairyman, Dec 21, 2010.

  1. SmokinCAT

    SmokinCAT Road Train Member

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    Oct 20, 2010
    Hillsboro, OH./ Adrian, MI
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    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.
     
    dairyman and Eighterfromdecatur Thank this.
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  3. Eighterfromdecatur

    Eighterfromdecatur Bobtail Member

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    Apr 10, 2012
    Decatur TX
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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. little cat 500

    little cat 500 Road Train Member

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    Jan 17, 2010
    Abbottstown PA
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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
     
  5. Rob379

    Rob379 Bobtail Member

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    Oct 27, 2018
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    Hey fellas im having the same problem. I just got a brand new fuel transfer pump put in and was running my first trip with it. (Had the problem before but it got solved.)Heres the problem tho ive got a huge chunk of lumber in my fuel tankthat fell in while i was trying to check my fuel level. So do you guys think that lumber weakend my tranfer pump once again? I should have probably got my tank cleaned which i am now regretted as Im 200 miles from home
     
  6. Smokie joe 64

    Smokie joe 64 Bobtail Member

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    Feb 9, 2020
    0
    I have a 3406 b it started revving up on it on what's tha problem
     
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