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no fuel pressure 3406

Discussion in 'Trucks' started by Beetle_Spin, Sep 26, 2022.

  1. Beetle_Spin

    Beetle_Spin Active Member

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    im haveing trouble getting fuel pressure on my 99 3406 2ws i got a gage and i can get it up to 5 psi with the hand pump after a while of pumping but once i turn it over to try to get it to build pressure i lose it all instantly new fuel lines new transfer pump new filters and new fuel regulator valve any ideas im about to check the injector o rings soon also the primary fuel filter will get sucked almost dry every time i turn it over
     
  2. Truck Shop

    Truck Shop Senior Member

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    There are check valves in the filter base and there is a check valve in the primer pump, those need
    to be checked first. If the one in the primer goes bad/rolls it won't start.
     
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  3. Beetle_Spin

    Beetle_Spin Active Member

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    i changed the check valve thats on the bottom of the filter base but there is another one in the hand primer itself ?
     
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  4. Truck Shop

    Truck Shop Senior Member

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    Yes.
     
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  5. Coaldust

    Coaldust Senior Member

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    Yeah. Sounds like a primer pump issue.
     
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  6. Cmark

    Cmark Senior Member

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    Maybe 20 years ago there was a batch of hand primers where the rubber piston would break up and block the outlet. I would have thought that they would all be worked out of the system by now, but you never know.
     
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  7. Coaldust

    Coaldust Senior Member

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    My how time slips by. I remember that. Seems like the latest ones are cheaply made and leak prone out of the box.
     
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  8. Truck Shop

    Truck Shop Senior Member

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    Only other time I've seen the filter sucked dry {6TS 3406} T-800, the sending unit fell to pieces and
    blocked pickup tube in tank. As soon as engine shut down the piece would float away, start back up
    then die at sporadic intervals. It was a fun one to troubleshoot. Had plenty of fuel psi.
     
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  9. Beetle_Spin

    Beetle_Spin Active Member

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    heres a update these hand primers are junk had 2 break right out of the box back to back. But got new fuel lines and i pressurised the tanks and used the hand pump and got about 20 psi on a gage i hooked up.Had someone come over and said the fuel transfer pump was on upside down ? so i fliped it when we spun it it was sucking air out of the line that pushes fuel into the system. He also said i was missing a battery cable to the starter only have 1 main wire from the batterys said i need 2. Hooked jumper cables to battery amd starter and it turns over great just still no pressure. it seems like the hand pump is working but then agin the past 3 new ones iv gotten have literaly came apart as soon as i use them.
     
  10. Beetle_Spin

    Beetle_Spin Active Member

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    Also took apart the entire fuel system and blew all the lines out and pulled injectors to discover one had a broken spring.
     
  11. Beetle_Spin

    Beetle_Spin Active Member

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    Im gona make a new cable for the battery and instal the old primer pump that i origonaly took off the truck to see if it still works. its sucking when i hold it aginst my hand so only way i know to see is to try it out. Cant see it causeing any more harm seeing im struggleing to get any psi i normaly get about 2 or 3 psi right now with the hand pump on it then lose it all when i turn the truck over
     
  12. Oxbow

    Oxbow Senior Member

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    To expand on what Truck Stop said, there are two check valves in the primer pump base, each about the size of a dime. If they look identical one has flipped over.

    Likely not your problem as you have tried other primer pumps, but it only takes a few minutes to check them.
     
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  13. Beetle_Spin

    Beetle_Spin Active Member

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    makes sence ill pull it off ans look
     
  14. Beetle_Spin

    Beetle_Spin Active Member

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    i changed the primer it definetly seems like that was part of it but i broke the gasket so have to make a new one tomarow also added the extra power cable and she turns over like it should just have to prime it now becouse it burped a few times with what fuel was in the injectors can anyone explaine the proper way to bleed the system
     
  15. Beetle_Spin

    Beetle_Spin Active Member

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    has anyone ever seen a transfer pump flow backwards mine is pushing air from the sucktion side and sucking from the push side seems like i got a faulty pump
     
  16. Cmark

    Cmark Senior Member

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    What's the part number of the pump?
     
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  17. Beetle_Spin

    Beetle_Spin Active Member

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    id have to take a look tomarow
     
  18. Beetle_Spin

    Beetle_Spin Active Member

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    033022 0010 384-8612
     
  19. Cmark

    Cmark Senior Member

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    That is a rear timing case mounted pump. Is this what you have?
    What's your serial number?
    upload_2022-11-4_6-7-2.png
     
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  20. Oxbow

    Oxbow Senior Member

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    If I'm not mistaken there are two rod lengths for those transfer pumps.