As stated above the condition is key. In my 49 the old gas had coroded and rusted it to the point when I pulled the drain plug nothing came out. I had to shove a screwdriver in it to break through the muck. I cleaned it myself breaking the rust out by filling it with small rocks and shaking it. Once I got down with that I sealed with some sealant. Don't remeber the brand but it was alcohol restitant a key thing with ethanol being added to gasoline and it has never failed me. Two years and haven't had a problem and it is ran weekly.

Bottom line if its like my tank and you put it back on without sealing it expect to rebuild the carb and fuelpump weekly and blow out the gaslines and if it is in good shape then why drop the 50 odd bucks but it is insurance that you won't have to remove that tank for a long time.

1941 Chevy Series AL 3/4-Ton Pickup Truck and 1949 Chevy 2-door Fleetline Delux Sedan