[Randy Rosenberg]

The engine stops because the battery switch should be wired to shut off all electricity to the car; ie: ignition. No igintion, no spark; no spark, no run.

HOWEVER, Blas never stated "where" exactly the fuel was leaking from the tank. If the tank is punctured, then fuel will leak regardless of whether there's battery power, or electric/mechanical pump, etc... And this can be problem.