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I run the gas cooler and the tape on the fuel tank and have found that with the two in place i get 45 seconds a tank more run time in a truggy and the fuel is 9 degrees cooler at the carby, so read into it what you will i have swapped the tank and return line three times for the same results, 41 seconds, 43 seconds, 45 seconds and 8, 9 , 9 degrees cooler fuel which adding these all up in the end you get a fraction more run time, or need less fuel at each stop and the engine runs that little bit cooler due to colder fuel which means you could even lean the engine a little more and maybe grab 1 minute extra run time ifyour looking for the fine line......
Leaks are about the only issue you can run into but then again the standard set up can fail all the same....sometimes stuff just happens