This diesel has done this since day one. I noticed the PO used the throttle to start it. After I got the boat home I changed one of the racor filters witch was a 30 micron and went back with a 2 micron, and it had a very small amount of trash in it, not near a 1/2 a cup. Then I changed the filter on the engine. I also polished the fuel tank the best I could for over an hour, and found very little trash in it. Now I am thinking of the small filter in line before the filter on the engine. Do you have this small filter on yours? It looks to be just a small in line filter. I don't know if this factory or some one added in. I am thinking that the engine has to many filters. Two Racor 500s, that little inline filter, and the filter on the engine.