The rear tank doesn’t like to take fuel

[franklin2]

Found a good writeup on how to do a better tank vent mod

1994-1997 Power Stroke FAQ - Fuel Tank Vent Mod

www.thedieselstop.com

Not sure why that guy in the article had vacuum problems with his tank. I thought all modern fuel caps let air in, but not out.

I ran into the same problem he did, not at the beginning, but later on when one of my hoses fell down. I filled the tank and some fuel got in the belly of the vent hose where it fell and sagged. I finally figured it out and lifted the hose and got the fuel out of it, then everything was back to normal. You definitely need a constant downward slope on the vent hose so it will stay drained of fuel.

 

[Wrenchmonkey316]

Not sure why that guy in the article had vacuum problems with his tank. I thought all modern fuel caps let air in, but not out.

I ran into the same problem he did, not at the beginning, but later on when one of my hoses fell down. I filled the tank and some fuel got in the belly of the vent hose where it fell and sagged. I finally figured it out and lifted the hose and got the fuel out of it, then everything was back to normal. You definitely need a constant downward slope on the vent hose so it will stay drained of fuel.

Thank you. I’ll check it.

 

[Clb]

In a fwiw tech 101
I got this one from my kid who was a master tech @ ford ...
He would pull the driver side bed bolts and loosen the pass side all the way and jack up the bed.
Its a pita but you rust belt guys know why.
Just enough room to get the job done.
The deiselstop link is a good one.
Realize that the (?rear?) rollover valve is REALLY REALLY close to the bed, so measure closely when modding it.