The problem could be the carbon canister or the control valve. Pull the
bottom hose on the canister. If it is full of carbon, then that is the
problem. Check the valve operation. It needs to open when the throttle
opens. You can usually hear it click. A shot from an air hose will usually
pop the tank back. If you have one of those Taiwan replacements, be real
careful as it can easily be over popped open.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Rob
Sent: Monday, September 25, 2006 10:11 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Pressurize a gas tank?

I think my charcoal canister put a vacuum on my tank and the bottom
is sucked in a bit, when I need 13 gal the van starts running like
it's almost out of gas. Anyone ever pressurized a tank to push the
dent out before?
I have never put more than 13 gallons in it. I either need to get the
tank bottom back to the straps or get a new tank, extra gas is good.

Rob
becida@comcast.net

With a '91 Subaru 2.2 in an '87 Vanagon in western Washington.