External tank
 

I just picked up a 92 gallon :yikes2: in bed tank with a 12 volt pump for a really really good price. How do you have yours plumbed in?

Wow, so with the 92 gallon tank and both stock tanks that's 128 gallons.

Say you average 18mpg...

that's 2,300 MILES on ONE FILL-UP!!!

Holy cow! Of course that's about $350 to fill it all up, but WOW!

I'm going to swap in the 38 Gallon rear tank from a late 80's F350 soon. I'm looking forward to that'll give me 56 gallons and almost 1,000 mile range on one fill-up.

axilary fuel tank
 

I have 90 gallon auxiliary fuel tanks on most of my trucks what I do for simplicity on my ’94s I have 38 gallon rear tank (Bronco style) and I take the filler neck and weld in a 3/8” steel pipe nipple a fuel inches from the top or the fuel cap so I can see if fuel is flowing. The using 3/8” steel hardware and a high quality ball valve installed in the auxiliary fuel tank drain, then I ran 3/8’ low pressure hydraulic line ( I use it for all fuel lines, good stuff).

It sucks when you walk to your truck the next morning and find a big puddle of $5 diesel fuel on the ground, because you forgot to shut the fuel valve off:cursin:. To avoid over filling I installed an electric shut off solenoid (normally closed) then I wired the solenoid to a toggle switch that is hooked into a “key on” fuse so fuel transfer can only happen when the key is on.

On my ’00 F550 and ’99 F450 I plumed the fuel fill line into the ¼” auxiliary fuel port on the factory 40 gallon after axel tank. I think this is and option on the cab and chassie trucks to run a diesel generator, compressor, welder, ect..