Forum Discussion

roadnerd's avatar
roadnerd
Explorer
May 23, 2016

Diesel Aux Tank wiring

I just scored a clean(ish) 50 gallon Weather Guard Aux tank + GPI 150s (15 GPM) pump setup on Craigslist. It will be going in my f250 (standard bed) to add a bit of range. It will not live in the truck full time, as I need the space for other stuff for "daily driving".

It seems like the easiest way to hook up the pump is just to get 12V off of the 7 pin connector that is already wired in the bed (PO setup it up to tow a 5er, I pull a TT). The only problem I see with this is the potential to have the fuel stolen, as all someone would have to do plug the pump in a start stealing. The only other real option (other than just throwing a 12V car battery in the bed when traveling), which seems like overkill, is to hook something up to an upfitter switch. This is not a DOT tank, so gravity feed is not an option.

Any words of wisdom on this?

22 Replies

  • I ran a power line to one of the batteries under the hood. I use a couple of large alligator clamps to attach the line to the battery when I want to pump. I've thought about putting in an inline switch, but just have never gotten around to it. :) I hadn't considered plugging into the 7 way plug, but that's a good idea. Except of course I have my toyhauler plugged into it. :)

    It's got a good filter on it? I worry a little about getting condensation and gook in the tank, but so far so good.
  • I have a very similar setup for my truck. I just wired in a 7 way plug for plugging into the in the bed recepticle with quick connects close to the male plug end. In a matter of a few seconds, I can pull the plug to stow away in the rear truck door storage pocket.

About Technical Issues

Having RV issues? Connect with others who have been in your shoes.24,283 PostsLatest Activity: Jul 17, 2025