I am trying to get my head around. How hot is it back there anyways. If it is hot enough to boil fuel would the fuel lines outside the shroud not also boil fuel. I would think the fuel injection lines sitting on top of the engine would boil fuel better until they are hit with pressurized fuel. The shroud/hose assembly is only going to work while in flight or maybe a little air with the prop spinning in ground ops. How hot is it back there?
Leaks. There is a tell tale drain on the pump. The pump housing would have to split or the diaphragm blow out the side. Seems like a really, really remote chance.