before you tear them off take out the drain screws on the bottom of the float bowls. maybe there is water in them.if no gas comes running out,your floats are stuck. if thats the case try tapping the floats with screwdriver or something lite. if you still don,t have anything try running a semi small wire up through hole .some times you can free up the floats that way. if you do have fuel then look for something else. go for the simple stuff first.