Ck'd your vac line? when was the last time you've replaced them? If it hasn't been done, it should.
How many miles do you have on your engine? Do you see any smoke coming out?
Lastly, if you're thinking of slapping on the cut-off switch to prevent it from flodding...you're going about the wrong way. If there's fuel seepage, your injector needs some TLC and correct that problem.
Hope things turns out OK!
Any more questions, feel free