1992 F150 gas tank over pressurized

[Tannerm]

Friend's son's truck they just bought has a rear tank issue. After driving it and shutting it down, u can he the tank hissing. You take the gas cap off, its sprays gas outward. (front tank doesnt work, so rear is all that they can use atm). I assumed that a tank vent is clogged or something. Your thoughts?

[BradM]

Matches.

[shumpertdavid]

Sounds like the tank vent is restricted or possibly the wrong fuel cap is on it. They can switch the fro t and rear cap and see if that solves it.

[Sean88gt]

so rear is all that they can use atm

Well, clearly. At least that's how it works in porn.

[YALE]

Sounds like the tank vent is restricted or possibly the wrong fuel cap is on it. They can switch the fro t and rear cap and see if that solves it.

Clogged evap line?

[shumpertdavid]

Clogged evap line?

It would be more likely the vent for the evap canister, at least if it were late model. I'm not working today or I would pull up the vent system on alldata and see how it's laid out. Best I remember the vent goes through the roll over valve in the top of the tank and either vents to the atmosphere or through the charcoal canister. I dont think they had a vent solenoid and suckike late model emmissions. I had this problem with my Regal when I removed the charcoal canister and plugged the vent line. I pulled the fuel cap apart and modified the pressure relief springs so it would let the tank breath better. It had 2 spring load diaphrams for pressure and vacuum.

[Tannerm]

Thanks. I passed this on to him.