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Message: [QUOTE="Strictly Diesel, post: 95738, member: 1411"] No change in my position. If you look at the fuel routing and consider that in order to get to the injectors, the fuel has to pass through a cast iron cylinder head (where the fuel rail is machined) which is at least the same as the engine coolant temp (likely significantly hotter), you are left with little conclusion other than the fact that just like the coolant, the fuel will remove heat from the head as it passes over it...making the fuel hotter as it moves through the system. In a return type setup, as the fuel leaves the head and goes back to the tank, the opposite happens. We found a pretty significant temperature drop between the head and the fuel tank just from the fuel passing through a metal fuel line that was cooler than the fuel. I understand the concept, but we have installed a bunch of fuel systems and driven them here in 115 degree+ weather with no ill effects and no apparent difference in how the truck ran (mpg, power, etc). My own trucks have been driven well in excess of 100k miles with these fuel systems and I've got a TON of customers with the same setup, if there was an issue, it would be apparent by now. FWIW, it does make sense to use a cooler on a Duramax (or other Common Rail diesel) due to the extremely high pressures the fuel is brought to...that will introduce some heat. I would say that in our application, 99% of the temperature increase through the system is from taking heat away from the heads, not from the fuel pump making pressure. If your pump has lasted almost 200k miles, and it costs you $400 to replace it, why look for something less expensive. Most of these trucks are 10 years old now...so not only did your pump got a lot of miles, it lasted a long time as well. I would challenge any aftermarket pump to do that as repeatably as the stock Bosch pump...and I would bet that there isn't one out there that will. [/QUOTE]