Adding dual tanks
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Senior User
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Adding dual tanks
Is it possible to add dual tanks to a truck w/ just 1 tank. What I'm mainly refering to is the electrical connections under & in the cab. I have a truck w/ dual tanks so I have all the parts I need(tanks, straps, fuel lines, dash switch, bedside, etc.) Is the electrical stuff ran from factory & just not used? Or am I going to have to add everything? Thanks.
Posting Guru
Joined: Jul 2009
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From: Toledo, Ohio
Anything is possible. If you already have the parts you know you need to mount up a selector valve and run the new lines and wires for the pumps. As for the trucks coming with the connections factory im thinking no, but I have been told they made one harness to make things easier. Maybe someone else knows for sure. But, it is possible.
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
The wiring inside the cab should be there, just unplug the selector jumper and plug your selector switch in place of it.
You will have to run the wires from the under hood dash to the tanks however.
It looks like you are working on 1990 or newer trucks so you will not use a selector valve.
You will have to run the wires from the under hood dash to the tanks however.
It looks like you are working on 1990 or newer trucks so you will not use a selector valve.
Thread Starter
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Senior User
Joined: Nov 2006
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The wiring inside the cab should be there, just unplug the selector jumper and plug your selector switch in place of it.
You will have to run the wires from the under hood dash to the tanks however.
It looks like you are working on 1990 or newer trucks so you will not use a selector valve.
You will have to run the wires from the under hood dash to the tanks however.
It looks like you are working on 1990 or newer trucks so you will not use a selector valve.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
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From: Easton,Ks
These two wire may already be there and the plug for the front tank may be taped to the harness near the where the tanks mounts. So I am not 100% sure if the wire are there or not under on the frame but would think not.
By the way what year trucks are we working with?
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
The frame wiring harness I am talking about is the C205 wiring harness.
C205 is the firewall plug.
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C205 is the firewall plug.
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Posting Guru
Joined: Dec 2008
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From: Rusty, Maine
Is the '93 a short bed? If so you may want to measure the front tank legnth. I'm pretty sure they didn't install the front tank on 4x4 short bed reg cab because of transfer case/gas tank clearance issues. Just saying. Good luck.
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Senior User
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Yep, it's a shortbed. The thought never crossed my mind! Thanks, Big, I'll check it out at lunch.
Fleet Mechanic
Joined: Apr 2008
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From: Vancouver BC Canada
x2. I've read previous threads about this.
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