D17D LOSING PRIME?

I am wondering if you have some foreign material in your tank or lines that is settling over the hole and not letting fuel pass, I cant see how you could lose your prime on an injection system where the fuel tank is higher than the pump, gravity would insure you always having fuel in the pump. Although on second thought I had a freind with a 560 diesel that was having that problem and I found on that one the injector was not seating allowing air into the system back to the pump so everytime he went to start it he had to work the air from the pump out the injector, but the pump itself never lost prime.I would get some new filters, blow air back threw the lines, on my 17 there is a small  hyd hose from the filters to the pump its possible that the hose has collapsed internally and not allowing fuel to pass anymore.

Thanks KC, unfortunately on Saturday night at 10pm, the only hose we had available was regular automotive gas line.  I will replace that on Monday with the proper hose as I don't want anything else getting ito the pump I just had rebuilt.  We did check the injector seating as best we could at the time.  The fuel tank is as clean as a pin (so to speak), although the fuel cap seal is in pretty bad shape and if I can find a new cap I'll replace that or at least the seal if I have to make one.  The previous owner had rebuilt the engine and the injectors, but not the pump.  I got the fun of having that done shorty after I purchased it.

possibly rolled or cut the fuel side cup seal upon installation, therefore fuel in the pump drains into crankcase. check to see if you're "making oil".

Thanks for the hints guys, I will start checking the oil regularly (or more than usual), so far after we went through the lines and replaced the fill hose, it has started normally.  I sure wish this thing had a little pump to enhance the prime, it's a little bit of a sequence to re-prime, and I hate loosening all those fittings over and over till it fires.

Now that's an idea and it also got me to thinking as we have an air compressor that continously lost prime.  It has a JD diesel of some vintage and it has a little lever pump that is supposed to help prime.  But the pump was worn out when we got it, so we added an electric fuel pump at the tank and we have had no priming issues since.  Has anyone ever put a "boost" pump between the tank and the pump on an Allis diesel?

Did you inspect the sleeve the seal runs in inside the pump? I'm told the seals will wear grooves over time and take the replacement out in short order.