check the wiring harness going to the ipr, if diesel leaks out of the "change fuel filter" sensor, the thing sticking out the side of the fuel filter towards the driver fender, with a black plastic cap, and always leaks, diesel will drip on these wires, melt the insulation off the wires, they will rub each other and no start(: mine did that and all i did was pull the wires apart that were all melted together and stuffed a paper towel between them to keep them from rubbing each other and viola fired right up another thing to do is unhook the fuel heater, cuz it can short out, blow a fuse, and cause a no start issue if the heater shorts out and blows a fuse so make sure to check all those maxis under the hood.