Thor Forums

[Judge]

I have an SV34 and I have not had any issues filling the DEF tank. Although even after 10,000 miles I have only added to it twice.

Have you tried using the Ford recommended DEF filler tube for 1 and 2.5 gallon containers?

https://www.amazon.com/Motorcraft-NO.../dp/B008B5WVF8

I also use the 2.5 Gallon bottles to fill it and don't use filling stations.

I have found that for diesel, the truck filling pumps have too high of a flow rate and the fuel will bubble up and keep shutting off the pump. The F-550 has pluming from the filler neck to the tank and a 90 degree bend so the high flow backs up.

I try to use Auto Diesel pumps.... it's a little tougher with a toad but I usually can find them.

Tractors have wide open fuel tanks with no plumbing so they can take fuel delivery as fast as the pump can give it.