dual tank ?

[slmann]

searched and found a few threads on this but really didn't get the answer. My brother has a 92 F-150 with dual tanks on it. The front tank doesn't work so he only uses the rear. When he got home today there was fuel coming out of from fuel cap/fill area. He said it was the first time it has done it. What's going on here and how do you fix it?

 

[Austin]

Did he fill it up recently?

 

[slmann]

he filled the rear a couple days ago.

I should have mentioned that it was the front tank that was leaking. Somehow fuel has got from the rear tank into the front and came out the fill spot.

 

[Fellro]

The return line is going to the front tank rather than to the rear as it should. The check valve in the hose or pump went bad allowing that. Not terribly uncommon unfortunately. Happened a lot with the mechanical switches as well. They did away with the mechanical switching device in 91.

 

[flareside_thunder]

What he said ^^^^^. That was even an issue with the electric switchable fuel tanks selector valves. I know this from experience lol. if it were me, I'd yank the bed and troubleshoot the front tank issue...that's basically a free tank of fuel just sitting there.

 

[Evan's f250]

Yes, that particular body style of trucks were terribly bad about doing this.

 

[slmann]

thanks guys, I'll have him check it out.

 

[Krafty]

That is weird I have an f-250 with the same problem but it is the opposite tank. If you fill both and start running off of the front tank first then front tank then fuel will spill out the back, so we have always just run off of the back tank.