I have a 37 chevy with a 216. Runs great but if it sits a few days the gas drains out of the glass bowl filter attached to the carb. What would cause the suction to happen and how can I stop it.

Thanks
Steve


1937 Chevy 1/2-Ton Pickup x3
1940 Chevy 1/2-Ton Pickup
1940 Chevy 1 1/2-Ton COE
1941 Chevy 1/2-Ton Pickup
1941 Chevy 1 1/2-Ton COE
1941 Chevy 1/2-Ton Suburban
1946 Chevy 1 1/2-Ton COE
1971 Chevy 1/2-Ton Pickup
In the Stovebolt Gallery