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Tank selector unit

Discussion in '6.9L IH & 7.3L IDI Diesels' started by 1992 idi 73, Nov 11, 2019.

  1. 1992 idi 73

    1992 idi 73 Registered User

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    Yesterday I filled up and flipped over to my front tank and took a road trip pulling a 14 foot enclosed trailer . When I got to my destination(hour drive) I noticed that the gauge had not moved! I flipped the tank gauge and my back tank showed a 2/3 tank. I'm guessing that its a stuck solenoid on the fuel selector so is there a good way to unstuck it. If it is broken is it interchangeable with gas units. Educate me please, Thanks.
     
  2. 79jasper

    79jasper Chickenhawk

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    The gauge switching gets done in the switch. Valve is only fuel selection.
    You probably have a bad sender. Some have gotten them to work by running a heavy shot of fuel cleaner, or biodiesel.

    Sent from my SM-N960U using Tapatalk
     
  3. chillman88

    chillman88 Supporting Member Supporting Member

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    Might on some years, I know on my 91 the gauge switches internally to the selector valve. There are moving contacts inside the switch.
     
  4. franklin2

    franklin2 Full Access Member

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    All years switched the sending unit fuel levels at the valve on the frame. It has a little motor in the valve, and it has the fluid section that switches the lines, and it has the switch section that switches the sending units.

    You will find the local parts stores sell these valves, if you want to do a search use the term "pollack valve" The valves in the stores are cheaper, but they are generic. Same exact valve made by the same company, but the lines won't plug right in, and the wiring won't plug right in, Ford contracted them to make a custom valve just for them. I think you can still get the valve from Ford, but it's not cheap.

    Here recently I had seen links to a valve (made in China?) that was on Amazon or Ebay, and it may be plug and play I am not sure. Do some checking on that.
     
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  5. 1992 idi 73

    1992 idi 73 Registered User

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    Alright thanks for all the responses. I will check my switch after school and if that's not it then I'll see if I can free up and test the selector valve.
     
  6. HawkDavis

    HawkDavis Registered User

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    rock auto has them, about $250.00
     
  7. 79jasper

    79jasper Chickenhawk

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    Actually, I may be thinking of gm.
    I do seem to recall some threads about bypassing the selector valve, having to connect the wires at the valve itself to get the gauge to work.

    Sent from my SM-N960U using Tapatalk
     
  8. 1992 idi 73

    1992 idi 73 Registered User

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    My issue is that the gauge works fine, the selector valve is stuck on the back tank even though the switch is on the front tank.
     
  9. franklin2

    franklin2 Full Access Member

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    Some people fight it and replace the valve every so often. They do have a habit of going bad. Some people get rid of it and just run one large tank in the back.
     
  10. chillman88

    chillman88 Supporting Member Supporting Member

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    Ah ok. It can be disassembled and cleaned if that is the issue. You're better off replacing it though.

    The four rivets will need to be drilled out and replaced with screws on assembly.

    There's a write-up on here somewhere but I can't find it.
     
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  11. Selahdoor

    Selahdoor How can I help you, or make you laugh, today? Supporting Member

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    Use this, on Google, to search:

    site:www.oilburners.net

    Put a space after it, and then whatever you want to search.

    It's better than most forum search engines.
     
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  12. aggiediesel01

    aggiediesel01 Registered User

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  13. Clb

    Clb Another old truck Supporting Member

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    Chevron techron fuel additive to clean the rheostat and old bulls fsv 101 in the tech section!
     
    Last edited: Nov 21, 2019
  14. 1992 idi 73

    1992 idi 73 Registered User

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    Update: I bought that same selector in the link( just off of amazon ) and it works great! At the same time I pulled my front tank(makes it easier to get to the valve) to replace my shower head that was floating around in the bottom of the tank. I think that some of the garbage of the front tank jammed the selector while it was on my back tank and when I tried to flip tanks it jammed. I might get around to taking the old unit apart after school tomorrow, if so I'll post about what I found.
     
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