Forum Discussion

Memphisdoug's avatar
Memphisdoug
Explorer
Nov 14, 2015

Auxiliary Fuel Tank Shut Off

I just purchased a used pickup that has an auxiliary tank installed. The aux. tank feeds into the vent line of the truck's main tank. There is a switch on the dash to turn on/off the aux. tank. I climbed under the truck to find out what the switch controls and found this. The fuel comes in from the aux. tank at the top of the picture and enters the two devices shown. The bottom thing appears to be an on/off solenoid but what is the top thing? Both have power from the switch to them.

Tow Vehicles
  • DirtyOil's avatar
    DirtyOil
    Explorer
    Nov 14, 2015
    I have similar set up, although I have a inline filter as well. You have a pump and solenoid valve (that is if that "top" part is between tank and solenoid valve). Also have manual ball valve right at the tank. The pump is on the small side, with a heavy load and strong headwinds, pump barely if at keeps up. Thinking I might find a higher rate pump.
  • transamz9's avatar
    transamz9
    Explorer
    Nov 14, 2015
    DirtyOil wrote:
    I have similar set up, although I have a inline filter as well. You have a pump and solenoid valve (that is if that "top" part is between tank and solenoid valve). Also have manual ball valve right at the tank. The pump is on the small side, with a heavy load and strong headwinds, pump barely if at keeps up. Thinking I might find a higher rate pump.


    I have mine running gravity flow and it will run in the tank faster than I burn it.
  • Memphisdoug's avatar
    Memphisdoug
    Explorer
    Nov 14, 2015
    So the top horseshoe shaped black thing is a pump? The guy I bought the truck from said when he switched on the aux. tank it pretty much just kept up with the truck running at 55 mph. I'm thinking a bigger pump would be a good idea so you could transfer faster than you're using it.
  • boogie_4wheel's avatar
    boogie_4wheel
    Explorer
    Nov 14, 2015
    Did 2 aux tanks like that. The small line and an in line filter keeps the flow rate slow. Added an in line pump to boost the flow rate so that it would transfer in a reasonable amount of time.

    +1 on the 1/4 turn ball at the aux tank outlet. Nice if you have a leak or need to pull the tank for any reason.

About Travel Trailer Group

44,029 PostsLatest Activity: Jan 13, 2025