Definity re-mount it away from teh pump to a better, more cooler spot. The mounting on the pump is a heat trap. I had my pump changed on warrenty (3rd one) just prior to the warrenty expiring (193,000 km I believe it is). I remounted the PMD and now have 350,000 km on this last pump with only one change of the PMD. The old one was still good but I am a cautious fella and wanted a good used spare anyways!
I know I will get some arguement back on this, but I did mount mine on top of the intake with an FSD Cooler. I realize this is not the best spot, but as the colder weather up here helps keep the engine temp down and the Duramax fan I use seems to pull a lot of air over the engine, it works for me! As well, I do very limited towing so I do not pull the heavy loads that other members do.
My 2 cents or so......
Iain
1994 GMC light duty 3/4 ton 4x4 w/ 6.5L TD 3.73 gears, FSD Cooler, DSG Oil Cooler, 97 Cooling upgrades, 21" Duramax Fan, Kenneday Fuel Pump Kit, 3" Mandrel Bent Turbo Down Pipe, Marine glow plug timer, Boost and pyro gauges.