Fuel tank venting...

[rusty ol ranger]

87 Ranger XLT 2.9.

Are the fuel caps on these vented? So as the tank level goes down, air is let in as to not create a huge vaccuum inside the tank?

Or is this handled thru the EVAP system?

 

[adsm08]

Fuel cap has a bi-directional vent to prevent vacuum or excessive pressure due to running the vehicle or changes in temp.

 

[rusty ol ranger]

Interesting.

Thank you.

 

[Bird76Mojo]

The 4.0 trucks had a vent on the tank as well.

#5 here: http://www.lmctruck.com/icatalog/fr/full.aspx?Page=37

 

[elscotto80]

The other day I opened my fuel cap and it let out a lot of pressure. Sounds like the cap is bad then? I didn't screw it on real tight after that and it seems to not vent as much when i open it. Besides the cap, is there anything else I should take a look at with the fuel system that would cause such an issue?