Where's the fuel filter on a MTD 139cc 21'' push mower?

SOURCE: yard machine 21'' push mower runs 2 to 3 seconds cuts off.

Tip the mower up on it's side with the dipstick tube on the down side and collect it in a suitable container. The gas you can do the same. When I drain old fuel, I mix it with a lot of fresh fuel and a bottle of dry gas then run it in my car.

SOURCE: Mower starts up great and then dies

If it's a briggs engine, sounds like you have water / debris in your carb fuel bowl. Using spray carb cleaner will only work if you remove the bowl and clean the carb jets. Also, you could have water in the gas tank as well. First, remove your air filter, then remove the 3 screws that attach your filter bracket to your carburator and mower. Take off your fuel line at the carb and drain all your gas into a clear jar. If it looks very yellow, cloudy, or see water in the bottom of the jug, change your gas. Using a half inch socket wrench, after gas line is disconnected, remove the fuel bowl and clean with carb cleaner. Also, examine the bolt you just removed. There are 2 jets in the side and one at the end. Using the carb cleaner, make sure they are clean as well. Use the carb cleaner extension tube to spray up inside the bottom center of the carb, where the bolt threads, to clean that area as well. After all this make sure ur float assembly is intact and reassemblt the bowl to the carb and reattach the the fuel line. finish bt reattaching the air filter support bracket makinf sure the gasket between the carb and the bracket isn't damaged.

SOURCE: Hi/low idle

Ok. First do one thing. Remove the air cleaner and start the engine. With your finger, push against the side of the governor spring to raise the rpm's some and hold it there. Is the 'hunting' still there? The tab the spring is attached to adjusts the governor speed and being located where it is, is prone to being bumped while mowing, pushed in and lowering the engine speed. If it still surges, this is what I would do... Remove the fuel tank and carb assy.. Two bolts, one behind the gas cap and one on the end of the tank. Pull it straight off the intake pipe then unhook it from the throttle link. Now, empty the tank and unscrew the carb from the tank. Clean the carb with a can of carb cleaner. Slip the screen off the pickup and make sure it's clean. Discard the pump diaphragm and gasket. Buy a new pump diaphragm kit, part #795083. Clean the top of the tank where the pickup with the screen fits into. Put it back together. Remember to put the rubber diaphragm against the tank and the gasket on top of it then the carb. Don't forget to attach the breather tube when you're putting it back on the engine. That should fix 'er up. Also, if the rubber ring and plastic retainer ring came off on the intake pipe when you pulled the carb and tank off, snap them back in the end of the carb before sliding it back on the intake. Hope you can make sense of all this. Let me know how it goes. Dwain

SOURCE: Yard man mower 139cc OHV spark plug

You can purchase a boot puller or take a pliers and grab exactly on top of spark plug and pull off. Some do stick on harder than others.

SOURCE: oil for yardman lawn mower

Only 30wt DETERGENT HIGH QUALITY oil, never use NON detergent or 10-40. Takes approx. 20 ounces to fill