The PMD died in my truck back in Sept so I parked it, it has about half a tank of fuel in it, 5 days ago I installed a new PMD and the truck fired up instantly with no hesitation, I let it run for 30-45mins, I went to start it 3 days ago and no start. It cranked but won't start, checked the fuel filter and it was clogged up with gelled diesel, so we replaced the filter, added diesel 911 to the tank and the filter housing, then added fresh diesel to the fuel tank and the filter housing as well, tried starting it up and still just cranks with no start, when I turn the key to let the glow plugs warm up we can hear the fuel relay but it doesn't fill the filter housing, we've played with the air release valves on the filter and the front of the motor, when we spray quick start down the air filter it fires up and then stalls out.. I'm at a loss and so is everyone I've asked to try help..