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1986 6.9 fuel issues

Discussion in '6.9L IH & 7.3L IDI Diesels' started by Laine D, Nov 3, 2019.

  1. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    That's one that hadn't occurred to me, but it makes sense after 30+ years.
     
  2. Laine D

    Laine D Full Access Member

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    The only thing that kinda got me was how cheap it is compared to everything else.
     
  3. Laine D

    Laine D Full Access Member

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    So at this point I’m thinking about doing a manual valve like my f100 has. I found a 6 port manual valve that I would mount right next to the drivers seat.
     
  4. Laine D

    Laine D Full Access Member

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    A344F1ED-5EAF-4DD3-916A-DE8BA1468DF2.jpeg So I ended up bypassing my tank selector valve. I am running off of the rear tank right now. I have a clear bowl on my fuel pump and I can see the fuel level in the bowl go up and down significantly. It will be all the way full and then will all go down to about an inch off of the bottom of the bowl. It looks like it is still getting a ton of air. I will swap over the lines and run directly from the front tank and see if that changes anything
     
  5. Garbage_Mechan

    Garbage_Mechan Garbage Mechanic

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    Folks have reported air intrusion at the fuel bowl gasket on the Facet pumps. Might pull it off and check it out. If I recall correctly the poster fixed his issue by cleaning and greasing the seal. The reinstall. Not too tight! Plastic....
     
  6. Thewespaul

    Thewespaul Supporting Vendor Supporting Member

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    Laine blow both lines out back to the tank and make sure they are clear. Like GB said, the bowl will pull air under a good amount of suction.
     
  7. Laine D

    Laine D Full Access Member

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    I’ll check that out, maybe it has vibrated loose or something?
     
  8. Laine D

    Laine D Full Access Member

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    I will. When I cut the lines to bypass them they had a pretty good flow out of it. But maybe there’s a clog. I’ve kinda eliminated the shower heads from my issue because they were supposedly replaced before me and I can run the truck all the way to empty with no issues. It was weird seeing the pressure surging.
     
  9. Laine D

    Laine D Full Access Member

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    So what I plan on doing is pulling my bed off next week and go through my tanks and fuel lines. I’m sure that my issue is just revolving around the age of the truck lol.
     

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