Ok, first off I have little mechanical skills and have been learning the past year so keep it simple. I was given a 4230 that has been sitting in a field for 18 years (supposedly running when parked). I got it home and changed the fuel filter and checked and added appropriate fluids. It immediately turned over but wouldn’t crank. The tractor will crank and run when you spray starting fluid and continuously spray it. So my thought is the engine isn’t getting fuel since it will run on starting fluid. I cracked the fuel line from the tank to pump and got fuel there. I then cracked the line from the fuel filter to the injection pump and had fuel. How can I check to see if the pump is bad? Or can anybody help me with this?