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I'm not familiar this vehicle, but hope this information is of some help, first of all is your vehicle diesel if so does it have a priming bulb inside the engine compartment if so is solid if your try to squeeze it if the answer is no get the ford stared dash to the compartment and pump the bulb till it's solid if that works until you manually stop the engine then I know what the problem is. not many people know this but actually inside the fuel tank is a primer pump that pressurises the fuel line up to the priming bulb to make it solid at all times. This may need replacing if what I said above is what your experiencing, the fuel primer pump is usually located from the top of the tank. as I said I'm not familiar with you vehicle so it's only a suggestion of the possible cause of your problem.
Does the engine run fine after it starts? Most common problem with primer bulb losing prime is an air leak in the fuel line or primer bulb. Air leaks don't always leak fuel. If there is an air leak between the primer bulb and gas tank there is no pressure, only vacuum. If it is not a major leak it might not leak without pressure but it will allow air to enter the fuel line. If it is a very minor air leak it could allow air to replace the liquid in the fuel line over time, but so little air once it is primer again that the fuel pump can over come it with volume of fuel.
Primer bulbs do not stay firm, as they are when initially pumped up, after the engine is running. There are check valves in the primer bulb that hold pressure in the primer bulb and throughout the fuel line to the engine. Once the engine starts the fuel pump creates vacuum drawing fuel into the engine diminishing this pressure and releasing the check valves. At this point the primer bulb is just another segment of fuel hose allowing fuel to pass through it as the fuel pump demands. The primer bulb functions much better when the outlet side is higher than the inlet side. This position makes it easier for the check valves in the primer bulb to seat and release as needed. If the primer bulb is functioning properly and is positioned with the outlet side higher than the inlet it should not be necessary to cover the end of the fuel hose with your thumb to get it to prime.
If the engine is hard to start after being fully primed there could be a problem with the fuel system on the engine. Some engines are hard to prime once air has entered the system, especially fuel injected models.
If its identical it should work ,if not take the old one to a mower shop,to get correct one and make sure the choke is going right on when the cable is in choke position.
When you say plugs I assume its a diesel w/glo plugs. This could only be a fuel issue; its either dirty or it has water in it or has lost it prime pressure. Dirty or watery can be fixed by draining the tank and changing the filter then flushing the line by opening the bleed screw at the primer pump and pumping it out till its clear/clean. If its the prime pressure then open the bleed screw, pump till there is no air, close the bleed screw and pump until the primer gets too hard to push. Hope this helps.
It is a diaphram carb. Doe's the primer **** straight gas or does it have air bubbles in it? If it has bubbles in it then it is a leak in the fuel line.
If not then Unhook the intake fuel line and pump the bulb until all of the gas is out of it. Then pour the gas out of the tank and rinse it out with new gas. Pour in new gas and it should be ok.
I would recheck the carburetor to make sure you put the diaphragms next to the carburetor and not the gaskets. Please if it is not priming you may have the fuel lines hooked up wrong. Also check the fuel cap to make sure the vent assembly is there. If the tank is not venting, the tank will get a vacuum in it not allowing fuel to flow. HTH Good Day.
Priming the engine(put some gas in the sparkplug hole)..If.Start the engine.If only the gas from the cilinder is burned change the lines prom primer bulb.
try adding Sea Foam to your gas next time you mow it may work
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