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dual fuel tank wiring diagram/ help

  1. #15
    Senior Member bordsmnj's Avatar
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    i don't know what they call damned thing to be honest. i know what it looks like and what it does. i'd ask rexone. he sells them so he might know.
    Quote Originally Posted by Rep. Joe Wilson (R) View Post
    YOU LIE!!!!!


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  3. #16
    Senior Member matt1840's Avatar
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    Quote Originally Posted by HawaiianJet View Post
    I'm not an electrician, and am basically clueless about wiring and electrical stuff. So my question is, what is a single pole double throw switch? Is it a two position (on-off) type switch, or a two position (on-on) switch, or is it nether of these and something completely different like a three position switch? Can I see some pictures, and where can I get them?

    I am getting ready to do my fuel system and have do idea how to it. I am going to start a new thread on the entire fuel system rigging; plumbing, wiring, filters, pumps, all the stuff that goes into rigging a proper fuel system for dual tanks.

    Sorry about the thread jack Matt.

    Thank you.
    to make it simple... just get your basic 3 prong "on/on" toggle switch. you can get them at any local auto parts store..

  4. #17
    Senior Member Nordic78's Avatar
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    Why do you need 2 sending units, do your tanks draw pretty evenly? Mine seem too but I have the exact same length hose from both sides. Hey HJ it goes like this, power comes in on the pole, i.e. battery etc, and leaves on the throw, i.e. light, sender etc, so a single pole, double throw has one source of power coming in and it leaves to 2 different locations, on, off, on.

  5. #18
    Senior Member matt1840's Avatar
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    this was for my buddys boat i was working on. Both tanks have a sending unit and draw at different rates.. The problem being that the fuel line being ran from the tanks are 2 different lenghts before the "T" to the line that feeds the carb. One line is about 2' shorter than the other. I told him to fix it and that should fix the problem of the tanks feeding at different rates. But he still wanted to be able to read the levels of both tanks.

  6. #19
    Senior Member slotracer's Avatar
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    Quote Originally Posted by matt1840 View Post
    after researching how a sender and fuel gauge work together it clicked in my head. I knew exactly what was wrong. And yes the hand drawn diagream was correct. No power or ground are needed to the switch unless it is a lighted switch.

    here is what i switched up and works just fine now, did have to pull the senders to get them unstuck as they were stuck in the empty position. Everything works just fine and can read levels of both tanks.

    Thanks for the help.

    ok i have mine like this and still does not read on either tank. any siggestions on what i should look for?
    slot
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  7. #20
    Nuclear Powered
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    Default This is the correct way to wire your boat for easy identification (universial)

    Last edited by Classic Daycruiser; 07-12-2008 at 10:29 AM.
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  8. #21
    Senior Member 4trax's Avatar
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    I tried wiring mine exactly like this but my needle on the guage didn't even move. Now the only reason I am messing with my wiring is because the fuel level of the tank that is shown on my guage is not actually the tank I'm running from. So in order to check the fuel level in the tank I'm running on, I have to switch tanks. I want to see the fuel level of the tank I'm running off of and be able to watch my fuel level drop.

    This is how the switch was wired before I started monkeying with it. Does anybody have any idea why my guage is telling me the fuel level of the tank I'm not even running off of?
    I went in and got recircumsized again........I lost 10lbs. & was able to save the lives of 3 children in the burn center.........but it's not my fault they turned out to be dickheads.

    4trax@charter.net

  9. #22
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    4trax, there should be no wire going from the ignition switch to the selector switch unless it is a lighted switch. You should follow what Matt1840 did. Sending units are passing ground through them to minimize possible sparks in the tank.

    By connecting the selector switch to +12v you are creating a direct short. I'm surprised you havent melted your switch or popped fuses yet.

  10. #23
    Senior Member 4trax's Avatar
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    The switch does not light up but all my guages have lights & I am also running electric fuel pump. There is a solenoid of some type clicking when I switch tanks.
    I went in and got recircumsized again........I lost 10lbs. & was able to save the lives of 3 children in the burn center.........but it's not my fault they turned out to be dickheads.

    4trax@charter.net

  11. #24
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    Default I hope this picture thing works

    This is how I would wire your switch. This method will keep +12volts separated from signal and ground. Sorry about the black background. If it's too hard to read PM me with your email address and I'll send it to you corrected.


  12. #25
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    Default Dual Tank Dual Guage Question

    Okay guys, how about help with my problem? I have dual tanks with dual gauges and both gauges stopped working at about the same time.

    I am pretty sure both sending units didn't go bad at the same time. Can anyone show me the wiring diagram for this situation? Any suggestions on how to trouble shoot this would be appreciated.

  13. #26
    In pace requiescat povertyjet's Avatar
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    Default electric tank selector

    You would have 12v going to the switch if your boat was equipped with an electric tank selector valve. That may be the noise 4trax is hearing.

    p-jet

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  14. #27
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    It sounds like you have one of three problems:

    1. No positive from the ignition switch

    2. No ground to gauge


    And the long shot

    3. The single wire supplying both sending units with ground has a break in it and therefore both sending units are not sending signal to the gauge.

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