wrote in message
oups.com...
Dan, your explanation is theoretically correct, but Newps wrote from
experience. With an incorrectly located vent, and both tanks full, fuel
is
forced from left to right. The right tank stays full, and usually dumps
fuel out through the cap, which has a vent that opens both positive and
negative (Monarch caps, at any rate).

I have been maintaining Cessnas for ten years now, and the
proper Cessna cap will not allow air out of the tank. By law, an owner
MUST use parts as per Cessna parts manuals, and any other cap that
isn't PMA'd for that airplane is illegal. There is no way that the
airplane is legal if it's doing that, since it doen't comply with the
manuals.

Dan

Unfortunately, the proper Cessna cap allowed water into the tank.

Are you trying to indicate that the highly regarded Monarch caps are
illegal?

As to the uneven fuel feeding, refer to Cessna Pilot's Association Tech Note
003. The location of the vent pipe behind the strut is critical, as I said
in my first post.

Dick Meade
(Flying Cessnas for 10 years now)