Its also strange, I have the housing bolts loose and a clear line coming out. I can see some air and if I shake the housing it gets much worse. I have tried everything to try to get good seals on the housing. I have replaced the bottom seals and many o-rings. There is one oiring on the bottom that I acnnot find a good match for. Davco does not sell or even list it as an item.
Maxforce 13 fuel issues
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Transportauto, Nov 10, 2023.
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Can the restriction be after the housing and before the pump? Perhaps the clear line going from the housing to the primer bowl is to small. Or could it be after the primer bowl ?
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"I can see some air and if I shake the housing it gets much worse." This is indicative of a loose fuel line fitting or one that needs to be sealed.
What did you try? Did you remove anything threaded into the Davco, remove it and clean the male and female threads, then use tape and reinstall? Check for cracks, even use a magnifying glass. Use a small pick and brake clean to clean the threads if necessary. Also makes a difference how the tape is wrapped. Tape gets wrapped clockwise if looking at from the threaded end.
What Davco do you have? Navistar should be a Davco 483 or 488. The link for the parts list is below.
"I have replaced the bottom seals and many o-rings" Not sure what you are talking about as the whole unit only has 2 o-rings and some seals for the drain valve.
Service Parts Information - Product Support (davco.com)Last edited: Mar 2, 2024
Yippykyae Thanks this. -
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Look at this diagram, There is an o-ring on the bottom of the big hex bolt on the very bottom the the unit.
https://www.davco.com/media/davco/forms/F3086.pdf -
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