fuel tank vent?

DWRAT · #1 (**permalink**) 07-17-2016, 05:59 PM

How does my SPF fuel tank vent itself?
The vent tubing goes into the fill hole which is under the fuel cap.
There is not a vent on top of tank.
It must vent somewhere as i can run a full tank without a problem.

vatdevil · #2 (**permalink**) 07-17-2016, 06:28 PM

vented cap

DWRAT · #3 (**permalink**) 07-18-2016, 06:44 AM

Quote:

Originally Posted by vatdevil

vented cap

Got it, Thank you.

scootter · #4 (**permalink**) 07-18-2016, 08:02 PM

The gas cap has a tiny 1/8" hole in it. If you pull the gasket off the inside of the cap, it is like a tiny maze under it that the grooves are very very shallow. Mine plugged up causing pressure in the tank. I think that was one of my problems after running the car and shutting it down with pressure in the tank?!?!
Just got it all back to gather so I can confirm if its all good now. I drilled 3 more holes in the side of the cap, and put a .003 stainless shim under the gasket so it wouldn't plug up the grooves.
Scott

DWRAT · #5 (**permalink**) 07-21-2016, 04:35 PM

Quote:

Originally Posted by scootter

The gas cap has a tiny 1/8" hole in it. If you pull the gasket off the inside of the cap, it is like a tiny maze under it that the grooves are very very shallow. Mine plugged up causing pressure in the tank. I think that was one of my problems after running the car and shutting it down with pressure in the tank?!?!
Just got it all back to gather so I can confirm if its all good now. I drilled 3 more holes in the side of the cap, and put a .003 stainless shim under the gasket so it wouldn't plug up the grooves.
Scott

Thanks, I found that tiny mouse maze under the gasket, kinda crazy if you ask me, but it works for me.