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getting fuel additive in both tanks?

972 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?
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It's an odd duck for sure. It was a former motor home now a flatbed. A couple of kids stole it when it was a motor home and totaled it. I bought the cab and chassis and made it a flatbed. In '99 when I got it it had 7,000 miles, yes 7,000. It now has around 50. Pulled a 5er to florida twice, camper to Mexico once and off this month to Alaska with another camper.

It has a rear tank and another along the dirverside frame rail near the cab. One filler neck at the back puts fuel into the rear tank then when full it backs up, goes down another long pipe to the front tank. The y in the pipe is too far down from the filler to get a hose to snake down and squirt a shot of additive into the front tank. So, I have just put a shot into the rear tank, fill it, then put another shot in and hope it gets carried to the front tank. Not a very accurate method. I just thought others might have had this problem. I know the E form should be the place but the E folks go here too for the 6.9.
Very interesting idea! I wonder if when both tanks were full and the return line had to push against a full tank to push fuel back out, up the filler neck and into the other tank it would result in too much back pressure to the flow of fuel?
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