I have about a 30 or 35 gallon Aux tank i want to put on my truck and hook it up to the factory fuel tank. How did you guys that have them do this?

 

Get a Pollack 6way valve.
It does have 2 feed lines and 2 return lines switchable by a remote dash switch. So you need only the stock filter.
Now the cool thing: It does also have a fuel guage switch between both tank senders. So you need only the factory guage to read both, and all is controlled by that single dash main/aux tank switch.
Maybe you need a second lift pump.

 

What does it cost?

 

around 55 bucks when it is on sale...

 

around 55 bucks when it is on sale...

 

THanks for the info. I was thinking of a gravity flow system myself.

 

gravity flow is great if you put a switch on it... otherwise seeing the tank is above the fuel fill opening it will continue to fill the tank and let the excess drain out the filler until the level in the aux tank reaches the filler level....

if that all made sense....

 

It makes sense

 

No. I've had a gravity feed 30 gal under the toolbox in the '07 for over a year no prob. The rollover valve prevents any possible leakage as you suspect. The only issue in that regard is tapping a good leakproof connection into the main tank. I did it in conjunction with the vent mod and a three way valve. Very simple and reliable install, works great. Not sure how the Ford tanks work, but they can't be that much different.

 

Well we are gonna find out since im gonna install it tomorro im gonna T into my filler neck and run 1/2 hose from tank to the filler neck and have a manula valvle proboly a filter aswell