Forum Discussion

karldavidson's avatar
karldavidson
Explorer
Aug 05, 2018

Diesel pouring out of filler tube when cap removed...

Over 2 months ago, I installed a 40 gallon auxiliary diesel tank in my Ford F250. Yesterday, I noticed diesel was leaking out under my truck. I checked all connections and none of them were leaking. I...
Tow Vehicles
fj12ryder's avatar
fj12ryder
Explorer III
Aug 05, 2018
How do you have the auxiliary tank plumbed into the main tank?

If I've read this correctly diesel is coming out of the auxiliary tank when you take off the filler cap. If that's true then you've simply overfilled the tank and the increased ambient air temperature has caused the fuel to expand and the only place for it to go is out the fill cap.

About Travel Trailer Group

44,066 PostsLatest Activity: Apr 15, 2026