Our lawn mower will start, but after a very short time it starts shutting off like it isn't getting gas.It has the normal engine sound, gets quieter, louder, alternately, before shutting off. My husband has replaced the fuel pump, fuel filter, air filter, and vacuum hose. We were sure the new vacuum hose received today would do the trick, because after we had replaced the fuel pump and used a vacuum hose that wasn't exactly the same as the other, it ran fine for a while. Needless to say, it's getting frustrating. Have we overlooked something that might have been obvious? Thank you for your assistance.
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Sounds like you have a hole 'burnt' in the piston top allowing fuel combustion mixture (normally compressed above the piston) getting down into the crankase or that the piston rings are shot allowing the same thing.
As the piston is continuously moving, the reverse happens giving oil at the intake or carb.
. Looks like a strip down, good inspection and rebuild of engine required .
if its a briggs and stratton engine with the plastic carb fixed to top of the fuel tank then you will need to replace the diaphragm and blow out the fuel pick up pipe
It seems to be an obstruction in your fuel delivery system. Get a can of ether and a spray a short burst of it into the breather area near the carburetor, if the mower starts up and then stalls out, then you may need to get your carburetor serviced.
Float stuck in open position. When the gas evaporated in it there was a gunk left behind and then It was down and either froze up or there is trash keeping the needle valve from sealing up all the way.
So when you start it gas keeps pouring into the motor. It is suposed to shut off once it gets enough to run on.
Be real careful take the carb off and remove the bowl. And then the float. Take a q-tip and clean the needle valve port ou real good. And clean the rubber tip gently. Then put back together.
When it is upside down the float should be parallel with the carb. That would be the shut off point. You may have to adjust it.
That should do it. When you hook the gas line back up loosen the bowl and let gas in carb til it starts to run out. Then mow.
i have a riding mower and i get that problem sometimes and what i do to fix it is i take a metal pole and put against the motor and gear on the starter and push when it moves i turn the key and that normally fixes it.
On some mowers...if the gas cap vent is not working properly, it will run fine for about 15 or 20 minutes, start spitting and sputtering, if you loosen the cap, and let air back into the tank it starts running normally again.
you may want to check the gas cap. if the cap can not vent properly, the engine will not get gas. next time it starts to act like it is going to die on you. reach down and loosen the gas cap just a bit.
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