First off, the tank is 18 gallons and most of it is low on the gauge. How is the power output? Does it smoke much or excessively? It has a Lucas Delphi emissionized injection pump which I just took off of mine for an older style CAV as my timing advance had destroyed itself and wouldn't adjust advance or retard correctly. It smoked badly, had poor power, was getting hot, and I couldn't keep fuel in it. This is about the same engine as older Ford tractors which are run into the ground with few problems. I use mine for tree shear and cleanup grapple work and from experience, it will run much longer than 6 hours on a tank of fuel, even loaded. It is rated at 3 gallons per hour at full load. I will admit I let my air filter get a little bit too dirty but it hasn't affected its performance as the pump has.
