Hi guys, I'm new here and new to the diesel world. I did a few nights worth of searching various forums in hopes of finding a solution to my problem. So here's my story. I just recently picked up a 98 jetta tdi from a buddy of mine who owns a car lot. 3 months agoish he replaced the injection pump with what appears to be a used one. Not sure if it was replaced or re-sealed. Was told it was running fine and he drove it to his new shop location before he let it sit and now it won't start after sitting. Not sure time frames are exact but it sat long enough to let the battery die. I'm having an issue getting fuel to get to the injection pump and staying there. I drained and refilled the fuel filter with fresh diesel, pulled a vacuum on the return hose going to the fuel filter, and that brought the fuel level up to the injection pump in the clear inlet hose. I then tried to start the engine and it would not start. Fuel level again dropped further away from the pump after cranking. Pulled a vacuum again to get the fuel back to the pump. Once that was done, I cracked the fittings at the injectors and was able to get some fuel to seep out, not sure at what pressure it should be coming out, tightened them back up and tried to start and the fuel level went back down in the inlet hose. The engine will fire over on starter fluid, I just cant maintain a prime on the pump and I'm not sure where to look next.