Disconnect the line at the pump and see if there is adiquate flow and pressure. If so reconnect and check for a kink in the line. If not try and back wash the system, meaning disconnect at the pump and force the water in the opposite direction from the lines in an attempt to dislodge any thing that may have gotten stuck in the line.
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A washer pump in a car's windshield wiping system moves washer fluid from a reservoir through hoses. The motorized pump pressurizes the fluid to allow it to be squirted from the hoses through nozzles onto the front and/or rear windshield of a car. The washer fluid helps windshield wipers get rid of rain, dirt, or other objects that can interfere with a driver's visibility. If your washer fluid is not being sent out when activated, the solution could simply be filling the washer system's reservoir with more fluid or cleaning the nozzles and hoses. In more severe cases, the washer pump may need to be replaced. Here are steps to troubleshoot a windshield-washer pump.
For front windshield, the hoses are usually easy to locate and replace. This is cheap hose so replace it. Other issues are that the spray nozzles can freeze if you don't have correct fluid in them. Most of these can also be replaced, but this may be harder depending on the location. I don't know on your car, but many modern cars have these attached to the wiper arms, so it may be very easy.
I would start by checking fuses. If you've checked already, then the windshield washer pump has probably gone bad. The wiper motor and washer pump should be separate units. Typically the washer pump is located in the base of the washer fluid reservoir.
If you hear the pump running when you try to use the washer pull off the lines on the pump and make sure they're clear. If the lines are clear you need to replace the nozzles. If you don't hear the pump running at all, replace your windshield washer pump.
glow plug relay should be on the front are rear of intake.you have a mechanical low pressure pump on the passenger side low near the front. or a electric low pressure pump on the starter side. your truck should have the low pressure electric pump. to check fuel pressure you disconnect the out let line to do a out put test.on the electric low pressure pump.put out let line in a container.crank engine for 20 to 30 sec.you should have a good flow of fuel no dribbles.if dribble replace low pressure electric pump.the mechanical low pressure pump out put test you disconnect fuel line from the fuel filter inlet line.disconnect wire at fuel injection pump electric shut off solenoid .place the fuel line in a container. crank engine for 20 sec. fuel flow looks good.pump is good .if dribbles.replace mechanical low pressure pump.to check glow plug relay you need a .diesel repair ford manual to show you where to put a test light to check the relay.WEAR SAFETY GLASSES WHEN WORKING ON DIESEL ENGINES.DONT DISCONNECT THE INJECTION PUMP LINES WHILE ENGINES IS RUNNING.THE FUEL PRESSURE IS SO HIGH SPRAY IN YOUR EYE CAN CAUSE BLINDNESS.GET IN SKIN OR SORE CAUSE BLOOD POISON. CAN ALSO CAUSE A FIRE BE VERY CAREFUL.
The windshield washer pump is part of the windshield wash reservior.
There is an electrical connector located on the bottom of the reservior.
That is the pump .
If the pump is not in the reservior. I would just trace the washer fluid lines from the sprayer on the vehicle back to the pump. The lines just might lead back to the reservior for the windshield wash solution. Then you will have confirmed the pump is in the reservior.
You may have to get a new reservior. The pump might not be seperate item, I am not 100% sure on that.
I also would double check the fuses and any relays related to the washer pump.
Finally, I would check the washer switch if you replace the pump and still is not working .