It doesn't really work like that. If you added an air compressor to the fuel tank providing positive pressure, then it might work, but just taking the cap off won't do jack. If the car is new enough, taking the cap off will induce faults into the evap emissions system. What kind of car is it and how do you know that the pump took a shit? I might be able to help you find a fix if I get just a little more info. Water won't hurt a gas fuel system as much as it would diesel, but the car will still run like absolute crap if you get to much water in it.
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