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switching valve for duel tanks, how to test it Update one more ???

Discussion in 'The Garage' started by 84CUCV, Feb 28, 2007.

  1. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    switching valve might be bad. so how do i check it out? thanks :waytogo:
     
    Last edited: Mar 6, 2007
  2. az-k5

    az-k5 1/2 ton status

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    What year truck? FI trucks use a slightly different set up than carb'd.

    Check the switch in the dash first. It is a double pole double throw. Pull it out and make sure all of the 4 prongs do something. I had one dead pole on mine.
     
  3. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    its a 87 350, if its not the switch, how else do i check it? thanks
     
  4. burban1500

    burban1500 Registered Member

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    84cucv-will u part out that beater blazer?i want the rear
     
  5. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    i might part it out. i will be keeping that. sorry...

    If your looking i was told blewetts has a bunch of axles, even 1 tons. it sucks tho they pull it, not you. www.johnblewett.com

    later
     
  6. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    found it the # there is 732.938.5331
     
  7. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    anyone else??
     
  8. RootBreaker

    RootBreaker 3/4 ton status Premium Member

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    dunno if this will help....
    I did this in mspaint so enjoy my madd skillz.... :haha:

    this is how my 78 with dual tanks is wired....

    also side note... I think all the switch does is give power to the post on the unit...

    so if you take the part out... and ground it to the battery then hit positive it should click...

    someone please confirm first.. we dont need anyone blowing themselves up... :wink1:

    [​IMG]
     
  9. big dan

    big dan 1/2 ton status Premium Member

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    mine is wired the same as RootBreaker's

    is it not switching at all? try switching the tanks with the key on and the motor off and see if it makes any noise. mine is pretty noisy and you can hear it switching when the engine is not running.
     
  10. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    OK thanks guys got a good place to start now.
     
  11. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    do both tanks need to be hooked up for the system to work or can i just run it off one side? hope i can. that would be great need to be able to move it around. thanks
     
  12. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    OK i now know i can run it with one tank. i checked the wires for power. i was only getting 8v. it should be closer to 12v right? or am i wrong? thanks for the help
     
  13. RootBreaker

    RootBreaker 3/4 ton status Premium Member

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    well shove the 12v to it to see if that does it...
     
  14. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    OK will see how it goes
     

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