Recently we had to replace one of the mechanical fuel pumps on our Aztec due
to a leaking diaphragm.
When talking to several A&P's about the expected life of these pumps and the
cause of failure, most sited heat transfer from the accessory case to the
pump and lack of cooling being the primary culprits. Some A&P's recommended
turning the vac pump outlet to direct air onto the top of the pump, others
said that the fuel flowing through the pump should cool it until you shut
the engine down, then the pump absorbs the engine heat and cooks the rubber
diaphragm.

Not that it would help after engine shut down but I ran across this on ebay
today... http://makeashorterlink.com/?T297322BD Does anybody in the group
have such a shroud on their fuel pump? Aircraft Make/model?
Thanks
Jim