I have a Case 1294 a diesel engine and a CAV pump. I have replaced the mechanical fuel pump and the filters. I have siphoned the tank and only get clean fuel. I thought I had found the problem with it when I found where the fuel line connects to the tank loose. Today, with a full fuel tank, it quit like it ran out of fuel. It has quit twice in the same place after pulling a long hill. I loosened the bleeder on the filters and hand pumped the mechanical pump. I got fuel with no bubbles. I loosened the fitting on the line from the filters at the CAV pump and got fuel. I checked the bleed line where fuel flows back to the tank and there is a steady stream of fuel flowing while cranking. I loosened the bleed screws on the CAV pump and got a good flow from both when cranking. An hour later after it cooled off it started fine after I blead the lines at the injectors, even though bleeding them earlier made no difference. It then ran fine the rest of the day. I didn't put a heavy load on it the rest of the day though. It has Fram filters on it. I'm at my witts end with it and don't know what to do with it next. I'm tempted to pull the CAV pump and the injectors to have them tested.