Last Fall I got a 2000 Ford diesel truck because the F150’s gas engine turned out to be overwhelmed by the 24’ enclosed trailer upgrade. Over all the diesel truck has worked out very well, but one thing that’s been annoying me is the size of it’s fuel tank.
It’s supposed to hold 28-30gal depending on who you ask, but because of a poorly designed vent tube you can only get about 25-26 in it unless you are willing to spend 15min getting the last several gallons.
With the old trailer this wouldn’t be a big deal because it was small enough to pull in anywhere and get some gas. But with the big trailer I not only need diesel, but I need a place big enough that I can get the rig in and out. Plus, the price of diesel varies significantly so it behooves me to ID the cheapest diesel on the route. Ideally, I’d only stop once for diesel and it’d be the place with the best price.
For my first couple events with the new trailer I brought along 15gal worth of gas cans to bring my diesel capacity up to 40gal, but that’s a pretty inelegant solution. So I’ve been scheming on how to do an aux gas tank on the cheap.
On CL I found someone selling a Ford Expedition gas tank w/ fuel pump and got that for $100. Then I put eye-bolts into the bed of the cab and strapped the fuel tank down. Then I plumbed the fuel pump outlet into the primary tank’s filler port, and then created a filler pipe/hose and filler vent for the aux tank. To create the actual filler port I used the gas port from an e30, one of two that were in the attic already modified for a big throated gas “dump jug” for fast fueling during endurance racing. So an e30 gas cap will fit right on. The big throat is significant because a diesel nozzle is large. The truck has a canopy on it. Once the back window of the canopy is opened, the filler port is in your face.
Nothing should leak in the event of a rollover because the tank’s vents have checkvalves.
All I have to do now is wire a switch to the fuel pump and another switch that will choose with fuel level sensor is connected to the gauge. Once the primary tank gets low I just switch on the aux pump and the aux tank fills the primary tank. Should the aux tank go down to empty I have to be sure to turn the aux pump off because a pump running dry will overheat it. That’s why I have to wire in the aux tank’s fuel level sensor.
I’d have taken some pics but it’s not much to look at right now. Right now the focus is just getting it to work. Later I’ll make it pretty. Or prettier, anyhow.