Here is my discovery.
I pulled the filters off along with pump. I replaced the filters and the pump. Ran good for awhile then repeated the problem.
I pulled the filters off, assuming they had clogged. But they looked fine. I ran the fuel pump from my battery charger with the suction hose in a jar of diesel fuel treatment. It pumped perfectly and did not eject anything unusal.
Even I removed the clamp I had put on the line leading to the fuel tank but it only dribbled. I knew there was some fuel in the tank.
I poured more fuel in the tank but still only the same dribble???
I started up the air compressor, used a clean rag to block the inlet and blasted air into the tank. The dribble increased but still a dribble???
I crawled under the tractor and put the air nozzle into the line going back to the tank and gave it a shot of air. I heard a POP and i had diesel coming out all over me!!
With that, I used the vacuum pump and extracted all the fuel I could out of the tank. I even had a thick wire wrapped around the hose so I could direct the suction to the lowest point.
I put a half bottle of fuel treatment into the tank and let it drain through into a catch basin. I figured it would melt any "gum" in the tank. But I never saw what was actually clogging the line?
I was good most of the summer but it has recently started back. I am not a heavy user. Though 5 years old, it still has less than 100 hours. So it does sit idle for months at a time.
Not wanting to crawl under the tractor in 90 degree heat, I dumped a full bottle of diesel treatment into the tank (good for 35 gal) and am hoping it will melt the sludge that accumulated.
I only have one place to buy my diesel. It's automotive diesel.