It ran fine 3 weeks ago when I put it in the barn. I had hay delivered Monday and tried to start it and no luck. I put 5 gallons of fresh diesel in it BEFORE I tried to start it even though it was not empty. Engine is turning over fast enough. I cracked lines to injector and nothing is pumping, no fuel, bubbles, nothing. This tractor has NEVER failed me in the 20 years Ive owned it. I will check for possibility of clogged air filter but highly doubt this is the problem. Sgould I pull the teo fuel filters and see if somehow they may not have fuel or should I checkline too injector pump first to see if fuel is being delivered to the pump. Thete is no promer pump on this tractor as it is gravity feed to the filters.