GKranig1

my gas tank is vented to the trunk and looks weird.,do i need this or would a vented gas cap be ok.

Vintage Chief

Year & model maybe?

GKranig1

1966 cutlass.

307-5a

Gas tank vented into the trunk , does not sound safe or legal . Does trunk smell like fuel ?

OLDSter Ralph

How is the tank vented to the trunk ? With a rubber hose ?

nicks1966

The stock fuel tank vent is a steel tube that goes thru the trunk and back out, does yours look like this?

Olds64

My 71 98 has a gas tank vent under the trunk. There should be multiple rubber hoses coming off the top of the fuel tank that go to the vent and charcoal canister.

joe_padavano

A 1971 has an evaporative emissions recovery system that is completely different from the simple vent on the OP's 1966 car.

Olds64

Jeez...

GKranig1

yes mine looks like that and know it makes sense,thank you

307-5a

nicks1966 good picture of the fuel tank vent in the trunk .
could something in the trunk move and break the vent tube? then its venting into the trunk . or does this vent tube have a shield around it ?

Falkon

Is that maybe an early form of separator so vapor escapes w/o fuel getting out? Later cars like my '71 Cutlass have an actual vapor separator unit behind the back seat. Lines from the tank lead to it, then a line to the charcoal cannister in the engine compartment. The cannister stores the fumes, & is purged when the car runs.

joe_padavano

Gasoline vapor recovery systems were not federally required until part way through the 1970 model year. Before that the tank was just vented to atmosphere. The "J" shaped vent tube was intended to prevent liquid gasoline from coming out on steep slopes or under heavy braking.