Could be your gas tank roll-over check valve. Some attached to the
frame cross member just forward of the tank.
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Miguel wrote:
>
> My son's recently acquired '90 YJ (4 cylinder, 5-speed) has been
> smelling of gasoline, and a little checking revealed a broken valve
> tucked up inside the body behind the right rear wheel well. I have a
> factory service manual and have studied it carefully but can't figure
> out the purpose of this valve. It looks to be a check valve, on one
> side there's a line going to the fuel tank and on the other side
> there's a vacuum hose that runs up to the engine compartment. I
> thought mabe it was a rollover valve but according to the manual those
> are supposed to be attached the fuel tank.
>
> What do I ask for when I go to the dealer to get a replacement?