So far so good for me ... but one of my buddies who ran these pumps for his gasoline engines for years warned me to be careful which way up I mounted the pump. Supposedly these pumps are / were known for leaking after a while... and if you install the pump with the motor at the bottom this was VERY bad, because then the gas would leak down through the motor where it could start a fire. By mounting the pump the other way up, the above problem could be eliminated or at least mitigated.

I have not witnessed this problem first hand, but the guy who told me about it is very reliable, and not known for making things up ;-)

Gordon