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Return to tank?

Discussion in '6.9L IH & 7.3L IDI Diesels' started by kbenz, Mar 3, 2021.

  1. kbenz

    kbenz Full Access Member

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    Does the fuel return line have to go to top of tank? Or could it be towards the bottom?
     
  2. Farmer Rock

    Farmer Rock just a fella' without a 10mm socket

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    I am just guessing here, but I would imagine if you returned fuel mid tank or lower, it would back feed the return line due to the gravity, but I could be completely wrong.




    Rock
     
  3. gnathv

    gnathv Full Access Member

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    With a full tank it would restrict return flow.
     
  4. hacked89

    hacked89 Full Access Member

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    Sump kit returns bottom

    Sent from my SM-G955U using Tapatalk
     
  5. IDIBRONCO

    IDIBRONCO IDIBRONCO

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    I feel that you're right. There is very little (if any) pressure in the return line that comes back to the tank. I'm not sure if it would back feed or not, but I do think that a full tank may put enough pressure into the return system to back up the returning fuel and either cause the engine to run poorly or even make the engine quit running.
     
  6. gnathv

    gnathv Full Access Member

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    Sump kit returns bottom

    Does the sump have a return tube that goes to the top of the tank?
     
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  7. kbenz

    kbenz Full Access Member

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    Hadn't looked at one. I am putting a sump in an aux tank. Thanks
     
  8. kbenz

    kbenz Full Access Member

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    they don't appear to. I never knew they made a sump kit
     
  9. gnathv

    gnathv Full Access Member

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    DC32E85B-1CD5-4D83-BC40-9CE0EC62A88F.jpeg
    this is Rudy’s sump kit
     
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  10. hacked89

    hacked89 Full Access Member

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    Some do some don't. The one that Wes sells does not.
    I've thought about this situation and whether it will be an issue or not, the return system will probably be about 5psi but we will see soon. During my thinking about this last year, and looking at the sump pieces, it almost looks like the supply may create a suction flow that helps pull the return back in, like a circular loop versus static push upwards.

    I will be returning quite a bit of fuel cause my IP is hot and the electric pump.

    Alot of things like this we can speculate for awhile but I end up just testing and see what happens.


    Sent from my SM-G955U using Tapatalk
    [​IMG]
     
    Last edited: Mar 4, 2021
  11. gnathv

    gnathv Full Access Member

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    I know sumps generally provide better fuel flow but I’m just more concerned about a simple leaking hose or fitting dumping the whole tank on the ground.
     
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