I had a bad issue this Summer and it turned out my floats were bad. I run alcohol but then again most pump gas has alcohol in it now. Mine lasted 3 years. Changed out the floats and all is well.

1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time