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Most pumps on this type of machine are vacume pumps, they will have a third pipe that connects to the engine ( usually the rocker box ) where it takes a positive and a negative pulse from the engine, if the pipe is not connected or cracked it will not work, the pump itself is normally seale and non servicable, the engine may also have a fuel shut off solinoid in the bottom of the carb float bowl, if this is faulty or is not gettinf a 12 volt feed it will stop fuel to the main jet.

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This could be due to a number of reasons, such as a fuel filter that is clogged, a faulty fuel pump, or a blocked fuel line. Other issues include a faulty carburetor, a misaligned float, or a worn gasket.
The most common cause of fuel pump failure is frequently running the tank low on fuel, which causes the motor to overheat. The second most common cause is fuel contamination, usually dirt and rust particles that clog the fuel strainer and prevent the pump from drawing enough fuel under high engine load.
A working pump will squirt fuel into the carburetor. However, if no fuel appears, then verify the tank has gas and check both the fuel line and fuel filter for blockages. Inspect the fuel pump visually. If fuel is dripping, the diaphragm is faulty and you need a new pump.
The diaphragm is an internal rubber part that pushes the fuel through the pump that is generally found only in mechanical fuel pumps. You can usually see a part of the diaphragm through a small hole on the back of the pump. Some signs of damage are leaking, stalling, or fuel bubbling in the water.
The carburetor is controlled by pressure differences. In the main body of a four-barrel carburetor there are four venturi. The shape, size and length of each help determine airflow and fuel flow into the engine. The term venturi came from its inventor Giovanni Battista Venturi.
Throttle Valve:

The function of a throttle valve in a carburetor is to controls the air/fuel mixture (charge) that enters the engine cylinder. This throttle valve is opened when the accelerating pedal is pressed.

The basic operating system for an electric fuel pump is relatively simple. When the key is turned on, the powertrain control module (PCM) closes the fuel pump relay, which activates the fuel pump for about three seconds to pressurize the fuel injectors.
To confirm that your pump has failed, check the pressure in your fuel lines with a fuel pressure gauge; if it reads zero, then your pump is likely dead. You can also check your car`s fuse box; a blown fuel pump fuse is another reliable symptom of a failed pump.
When the driver presses the throttle pedal, the accelerator pump (a small piston pump or a diaphragm pump) directly pumps extra fuel into the carburetor throat. The accelerator pump can also be used to “prime” an engine with extra fuel prior to assist with a cold start.
To check fuel delivery, remove the fuel line where it enters the carburetor and use a length of rubber hose to direct the flow into bottle or similar container. Fuel should pulse out in strong spurts if your engine is equipped with a mechanical fuel pump (electric fuel pumps are more of a steady stream).
Blocked or worn air valve or muffler: Damage, corrosion or dirt on the air valve will affect the function of your Diaphragm Pump. Additionally, if the muffler is blocked, the pump cannot expel air effectively meaning the pump won`t operate efficiently.
Connect a vacuum gauge to the pump inlet – turn the air on to the pump – check the vacuum reading is as per the dry lift on the manufacturer`s literature. Turn off the air to stop the pump.
Fuel Rail and Pressure Regulator

The fuel pressure regulator is a valve that is located between the fuel rail and the fuel injectors. It regulates the fuel rail pressure and determines how much fuel goes to the engine.

To get slightly more technical, air is pulled through a “venturi”, or bottleneck, in the carburetor. This speeds up the air`s velocity and creates a vacuum. That vacuum pulls fuel from a float chamber or reservoir into the jet, where it mixes with air, flows into the cylinder where a spark plug is fired.
Thanks to the venturi, there is enough of a vacuum inside of a carburetor for the air passing through it to steadily draw gas from the jet. Found inside of the venturi, the jet is an opening where fuel from the float chamber can mix with air before entering the cylinders.
The carburetor float needle, moved by the float, controls fuel flow, maintaining the fuel level in the chamber.
The only things that are likely to cause fuel not to return are either a failed fuel pressure regulator, or an obstruction in the fuel rail.
A major cause for fuel injection pump problems is the use of dirty fuel. Over time, residue builds up throughout your system. Using poor-quality fuel exacerbates this issue. Bring your vehicle in for auto repair if you notice sputtering or your vehicle hesitates when accelerating.
To check fuel delivery, remove the fuel line where it enters the carburetor and use a length of rubber hose to direct the flow into bottle or similar container. Fuel should pulse out in strong spurts if your engine is equipped with a mechanical fuel pump (electric fuel pumps are more of a steady stream).
When the driver presses the throttle pedal, the accelerator pump (a small piston pump or a diaphragm pump) directly pumps extra fuel into the carburetor throat. The accelerator pump can also be used to “prime” an engine with extra fuel prior to assist with a cold start.
When the driver presses the throttle pedal, the accelerator pump (a small piston pump or a diaphragm pump) directly pumps extra fuel into the carburetor throat. The accelerator pump can also be used to “prime” an engine with extra fuel prior to assist with a cold start.

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1999 ford expiodition
ANSWER : Use a pressure gauge to check pressure at the rail. Change fuel filter. Replace fuel pump if needed.

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Why will my1994 bravada not start?
ANSWER : Very possible your new pump went out again, or was not installed correctly. Check fuel pressure. If you know electrical you can jumper the relay to run the pump. On some GM models I have seen a test wire for the pump underhood.

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Couple of guys tried to help me on this, perhaps you guys could come back. I forgot to mention there is a pressure tank bladder type on the discharge side. Could the air in this tank be messing with the prime. I checked the intake. It has water in it after bleeding air from the discharge system where before it was dry before purging air. I think there is air in the system and wonder if it is coming from the pressure tank?. i open up one of the discharge valves and a lot of air comes out. Should I put a valve on the pressure tank to take it off line until I get water from the well?

Mar 12, 2010 – Could it be the check valve? I took it off and the flap appears to be working correctly. This well has been here a long time. Never given me any problems. I do have galvenized couplers on the discharge and intake sides. Old. Could these be leaking even though they show no sign of water? The discharge is able to hold 30 pounds easily overnight. I do not hear any vacuum in the intake when I take it off. Could the pipe to the well have a leak? I know I would have to insert a sleeve but I do not want to go through the hassle if I do not have to. I had put on a brand new pump from the hardware store that did the same thing so I think that would elliminate the pump as being the problem.
I disconnected it for the winter and rehooked it up. The galvanized couplers on the discharge and pump side are old but do not appear to be leakeing as I taped them well. The check valve seems to be functioning well as I took it off and the flap works correctly. The well is not pulling water. there does not appear to be a vacuum on the check vale when I losen it. could the check valve be bad? I am aware I might have to resleeve the well, but do not want to hassle with this if I do not have to. I want to eliminate everything else first. i put another brand new pump on it to see if it was that. That partiuclar pump which was the same thng did not work either.
I took the pump nose off and looked at it. The one way valve appears to be working fine. The impeller is working fine also evidenced by when I turn it on witht the discharge cap off, water shoots out. When I open one of the discharge valves and turn it on, the pressure drops to 10lbs. At this point the prime water has moved through the pipe and and the pump does not soound like it has any water in it. I pull the cap off and have to “reprime it again.” It again goes back to the pressure gauage rapidly fluctuating while pump on. I disconnect pump on intake side I hear no vacuum. The guage is on the discharge side. The seals on the pump nose do not look frayed or damaged. The pump is not leaking water in any of the joints. The pipes on discharge and well side do not appear to be leaking.

ANSWER : My friend, please boil your question down. Your title has to do with riding mowers but the leaking, bladder, impeller, air bubbles, pressure tank, check valve comments seem to be migrating toward a pump of some kind – well? spa? pool? irrigation?

Briefly, any system that involves a water source, a water moving device, water storage device and ultimate useage is subject to leaks … into the system and out of the system. If this is a well and you have air in your system, your pump may be sucking air at the well or any loose connection between the tip of the pipe and the inlet to the pump. Your bladder could have failed but from what I can get from your comments, this is not the case. On the pressure side, neither air nor water will leak in … only out.

Please recheck all connections. Make sure your check valve is installed correctly and not leaking. The check valve assists the foot valve, which may have failed.

I am more inclined to think your well may be at the end of its useful life. To prove or disprove, you could have a plumber put a vacuum gage on your pump. He or she can answer this question is about 90 seconds based on this test. Expect to pay for one hour of time, which will be less than the time you have already invested in your project.

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My intex sand filter will not move water when I put the lever to filter? It will move water when I put the lever to recirc but wont move water with filter…why?
ANSWER : Im gonna guess that you stored the filter improperly off season and now the sand charge is hard as cement inside not alowing water to get thru , left alone for a week or so it might loosen up , but the best thing is to dissasemble filter and remove all sand and ck “fingers” inside this is fastest way
i allways use RV antifreeze 30/1 to store any pumps or filters off season , RV type because its nontoxic

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Fuel tank fuel pump is weak and tractor will run at times and other times will not start 6400 john deere tractor.
ANSWER : Have you tried giving it a good tuneup?

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Do you have step by step instructions for replacing the water pump on a Ford 2000 tractor?
ANSWER : I would like to know how to chane a water pump in my ford 2000 tractor, what would be the best way to do this?

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Mower keeps cutting off… It seemed like water in the gas. so I took fuel line off , but no fuel is coming in from the tank. Is this a top draw? Why am I getting no fuel
ANSWER : It should have a gas tank under th seat and it has a fule pump that pulls the gas up to the carb that dosent mean the pump is bad you may need a carb kit

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Sump pump hums and then kicks breaker. Will not pump. I cleaned everything, still have problem
ANSWER : Pump motor is jammed causing overload and resulting breaker trip. Try to turn the pump shaft by hand, it should be very easy to turn. If there’s any resistance check for blockage.

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