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What type of pump is it? Is it a shallow well pump or submersible
pump? Is the pump connected to a pressure tank? How have you confirmed that the pump is working properly? Is there a drain valve, and is there water pressure from the drain valve when it is opened? If the pressure tank is of the pre-charged type, is it working properly? Is there water coming out of the air valve? Are there any shut-off valves in the system which may have been turned off, preventing water flow?
first find the water pump for every vehicle ive ever worked on the water pump is always right above the main pulley once you locate the pump unscrew the hose from the pump to the radiator and then take all the bolts off the pump slowly wiggle the pump off so you don't damage the gasket on the water pump then take your new water pump and line it up to the holes for the bolt and put all the bolts back in and then reattach the water pump hose to the pump and to the radiator and then fill the radiator up and your good to go
A belt drives your water pump, most are the same belts that turn your altenator and air compressor. Some water pumps are turned by the timing belt. But if you can see that your belt is working the water pump, altenator and compressor, its working. If you had a water pump powered by a timing belt, you would not be able to start your car if that belt stoped.
Water pumps never stop working, they are direct shaft driven.
The only thing is they do start to leak after they get older, then need replacing.
1-If everything has been replaced can you turn water off and check air pressure in the water storage tank. the bladder may be leaking and causing it to work some. A 40 gal tank should have about 28 psi of air in it. Also you can press on valve at top of tank to see if any water comes out will let you know if it's bad. Air should come out at top and no sign of water from valve on tank..
2-When you changed pumps did you replace the check valve in top of pump. Some pumps I have had to pull back up and add a check valve to pump.
Most pumps have a check valve on top with a retaining clip holding it in. And they work sometimes and some have to be removed and add a brass check to pump and connect to water pipe.
Check the thermostat first. Follow top water hose from the radiator to the water pump. To check for problem with water pump see if you see anti-freeze somewhere leaking or do you hear a strange noise. Also check your top and bottom hoses.
If your pump is turning then something is stopping the water from being removed. If you can see the pump check to see if the water is becoming turbulent when the pump kicks on? If the water doesn't appear to move or is moving only a little then either the pump impeller is damaged or the screen that keeps debris from entering the pump is clogged. If it's never been cleaned it is most likely just a clogged filter screen. Clean it and it should work fine. If however the screen is clear then it is either a blocked line or a bad pump. And yes a pump can still run and not pump, if the impeller is bad.
if the pump is working correctly, it can either be, need more water to prime it, or something in the well, such as low water, plugged filter, etc....sometimes when you have a system that is intermittently used, it can take 20 or 30 minutes of continuous priming to get it to pull, enough water to maintain the prime.