The Diesel Stop banner

getting fuel additive in both tanks?

973 Views 6 Replies 4 Participants Last post by  ZOP
I've had my truck for 6 years and have wondered about how you get an equal amount of fuel conditioner in BOTH tanks and mixed evenly. When I fuel up I put in a shot then fill till I think the rear tank is full then when I think its headed to the front tank I put in the last shot (I have one filler neck for both tanks, it is an E). I've often wondered if when the fuel comes back from the ip if it goes to the tank from which it was taken - I assume so.

Any fillup tricks out there that might help us all?
1 - 2 of 7 Posts
Here's a thought. Since you have a shared filler tube that will allow fuel to transfer between tanks, and the fuel system is a continuous running loop driven by the engine lift pump, why not reverse the return lines to the opposite tank? As you drive, the return fuel will drain to the other tank and vice-versa with overflow exchanging via the filler tube and thereby mixing the contents as one. I guess it would depend on how high the filler Y is mounted to ensure it cross flowed instead of escaping out the tank vent (if any).
I don't expect that would be a problem; no more than full tanks in a stock system. The return line is always downhill, starting at the fuel filter which is higher than the filler Y.
I don't know how fast the stock return system will circulate fuel back to the secondary tank. But my basic idea is to continuously push fuel from the original tank where the additive is, into the new tank which would then spill back to the original tank via the Y. If you can't get enough flow from the return system, use a cheap electric fuel pump. Draw engine fuel from the stock tank first in order to use additive while the cross-mixing occurs.
1 - 2 of 7 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.