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Single Gas Gauge For 2 Tanks

Discussion in 'Early CJ5 and CJ6 Tech' started by chip biddle, Mar 28, 2018.

  1. chip biddle

    chip biddle Member

    does anyone run a single gas gauge for both the rear and seat tank? I install the gauge and new sending units last year and never finished the job, I have a 6 post switch that I think will work if I can get it wired correctly. does anyone know the wiring for this setup or what would work?

    Any help on this would be appreciated,

    Chip.
     
    chip biddle, Mar 28, 2018
    #1
  2. Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    A simple single pole double throw (three terminal) toggle switch will work- center terminal towards the gauge, outside terminals one towards each sender.
     
    Howard Eisenhauer, Mar 28, 2018
    #2
    Daryl, Glenn and Thean like this.
  3. mortten

    mortten I can’t put my finger on it 2024 Sponsor 2023 Sponsor 2022 Sponsor

    You have a double pole double throw switch. Hook it up like Howard says except use only one side of the switch.
     
    mortten, Mar 28, 2018
    #3
  4. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Yes...set mine up with a double pole single throw so it switches both the guage and the fuel supply line at the same time. Uses a Pollack style switching mechanism for the fuel line.
     
    Last edited: Mar 28, 2018
    FinoCJ, Mar 28, 2018
    #4
  5. chip biddle

    chip biddle Member

    James- this is the same type of setup I'm looking to do, do you have any more information on the setup or wiring?

    Chip.
     
    chip biddle, Mar 28, 2018
    #5
  6. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    See if this helps...it at least has some discussion, part numbers and links to wiring diagram.

    Fino's 1970 Mini Build Thread

    photobucket trashed my thread but I can get you some photos when I get back home to my PC where they are stored in a week or so.
     
    FinoCJ, Mar 28, 2018
    #6
  7. Walt Couch

    Walt Couch sidehill Cordele, Ga. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    [​IMG]Is this something like the type of pollak tank switch you are talking about? This gives you an idea of the switch double pole single throw.
     
    Walt Couch, Mar 29, 2018
    #7
  8. timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Yes, this is the Pollak valve instructions. This valve is sold as many brands. The DPDT switch here is used to move the plunger in the valve from one tank to the other by changing the polarity of the power connection. The advantage of this valve is its connections for both the tank source and return from both tanks. It also switches the gauge connections. This valve isn't cheap -

    If you have no return line, this is the same switch without 3 of the connections. Amazon.com: Pollak 42-308P 3 Port Fuel Selector Valve Kit: Automotive

    This Delco is the same part with 6 connections - https://www.amazon.com/dp/B0013FY5K...RE&pd_rd_r=1GA3Q89QGTC44602ZW5F&pd_rd_w=k01nU - you will need to buy the connector - same part from Standard - https://www.amazon.com/Standard-Mot...rd_wg=l1TiK&psc=1&refRID=7RSE66VNX6GRHS614KK2

    I'd buy from Amazon due to their easy return policy, but many other sources - RockAuto, eBay, etc.

    If you just want to switch the gauge connection, a SPDT (single pole double throw) switch is all you need. Connect the gauge to the center lug, and the two sending units to the outer lugs.
     
    timgr, Mar 29, 2018
    #8
  9. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Yes...thanks Tim and Walt - that is exactly what I did with the 6 port valve. I wanted the return lines to switch as well. The hardest part is the valve is set up for lines that are a size bigger than the jeep lines...so there is some extra rubber line to step up and down the fuel line between the hard lines and the valve ports. I mounted it on the firewall behind the air cleaner...oh and yes I think it is a dpdt switch. one of my favorite and most useful upgrades.
     
    Last edited: Mar 29, 2018
    FinoCJ, Mar 29, 2018
    #9
  10. Ole Al

    Ole Al New Member

    What do you use for the rear tank??
     
    Ole Al, Mar 31, 2018
    #10
  11. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    You can use any of the aftermarket cj 15 gal replacement tanks for 72 and later. They are not all the exact same...some differences in mounting and skid plate and filler necks....but all will work. I used a 72-75 replacement as I had all the other parts from that vintage from local salvage yard.
     
    FinoCJ, Mar 31, 2018
    #11
  12. chip biddle

    chip biddle Member

    Thanks for all the information, I have most of this already in-place so I just need to wire for the aftermarket fuel gauge. I'm running an electric tank selector, inline fuel pump, fuel pressure regulator with no return fuel lines, I've been running this setup for several years and it works great, less fuel gauge that is...

    I'm going to work on this in a couple of weeks when I finish my tie rod flip work that I'm doing now. I will post some pictures when complete.

    Chip.
     
    chip biddle, Apr 1, 2018
    #12