DO NOT PUT YOUR THUMB OR ANY PART OF YOUR BODY OVER HIGH PRESSURE DIESEL LINES!!!!!!! It can blow diesel fuel through your skin and that is NOT a good thing! /forums/images/graemlins/frown.gif
I think it might be a good idea to run a compression test on your engine. If you are losing compression all the fuel system work in the world isn't going to help it run. You are going to need to buy or borrow ( good luck on that one) a dedicated diesel engine compression gauge and than find an adaptor that fits your engine. You can get a gasoline engine to run fairly well on marginal compression, it uses spark to start the fire. A diesel engine, on the other hand, uses the heat from compressing the air in the cylinder to light it off. If you have weak compression the air doesn't get hot enough to do the job. You want to make sure you have enough engine to make spending the money on having the pump and injectors tested and maybe rebuilt. I grew up learning to yank the pump and injectors to send them in as a diagnostic routine, it's kind of an expensive way to find out your motor is worn out. Of course, if you just can't find a compression test adaptor for that tractor, there is the ol' WD-40 trick. This isn't a guarantee of motor condition but you can take the air intake off, run the tractor until it quits and then crank it while spraying WD-40 into the intake. If it runs on most all the cylinders you can be somewhat certain that it'll run after you dump a bunch of money into the injection system. /forums/images/graemlins/tongue.gif DISABLE THE GLOW PLUGS OR INTAKE HEATER BEFORE SPRAYING ANYTHING INTO THE ENGINE!!! If your glow plugs, if used, light up while spraying flammable liqiuds into the engine you stand a chance of an explosion or a flashback out the intake.