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It is possible that the machine does not start off the cycle because there are errors due to feedback from the inputs. For the program to start up the main program controller must initiate the INLET/MOTOR/DRAINpump/ valve to open up and allow each function to be driven starting from the flow of water into the drum as also the drain valve to open to exit the water at the point of the program cycle. If this does not happen then the voltage at the valve/motor/pump must be checked or the fault relates to no voltage from the controller. This means the controller is a suspect.
You should never try a pump without it being in fuel. It uses fuel for lubrication when it is running. If the vehicle doesn't start at all when you first crank it over it is not the oil pressure sender. If you just put the pump in you might want to turn the key off and on several times to cycle the pump then try to start it. If it doesn't start then check fuel filter or check fuel pressure at fuel rail in engine compartment. Is fuel pump cycling at all when the key is turned on? There is a problem with ignition switches on some of these blazers.
Did you check to see if there is power to the glow plugs if not then that may be the problem and if there is power when you cycle the key not to start but for the plugs to warm up you may have a bad glow plugs.
If it did not pump at all I would say you had a bad pump. Try removing hoses and check for plug up. If there is no plug up, I would manually try to adjust the timer to see where in the cycle it does not pump. It could be a bad cycle timer.
Remove drain hose from where it connects to the plumbing under the sink/tub. Inspect the spigot. If clogged, clean. If clean, then tilt machine back and remove drum to pump hose from pump. Check hose and also drain pump. Clear any obstructions.