My lawn mower will not stay started

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It's not getting enough fuel to the carb. It may have some water in the fuel so unless you are 100%certain it is good gas then I recommend draing all the gas out of the tank and also removing the carb and clean it.

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only other thing i can think of is has the air to petrol screw been moved

Your Poulan Pro mower is made by American Yard Products and the parts will interchange directly with Craftsman 22" mowers. You should be able to find a replacement at your local Sears store. All of these part #s are also 22" AYP blades:
AYP #'s
406713
192682
157101
335256
114886
141114
Rotary #15-6236
Oregon #
95-043
95-042
95-055
95-023
95-021
95-602
The different #'s should all fit. Some of them are bagging style blades (high lift) while others are designed to mulch.
Online sources will include www.searspartsdirect.com and www.amazon.com

Good Luck!

My guess is that you have hit something pretty solid while mowing. You have either bent the blade, bent the crankshaft, or both. To check for a bent crankshaft, set the mower up on a table or tailgate where the handle is on the ground and the spark plug is pointed into the air. DISCONNECT THE SPARK PLUG !!! You don't want to risk starting it in this position. While a friend holds the engine brake lever closed, and pulls the rope, you need to watch the blade bolt. If the bolt spins without wobbling, just replace the blade. If the bolt wobbles, then the crankshaft is bent. A bent crankshaft can be straightened by a reputable shop. Not all shops are will to straighten crankshafts. It is not a cheap repair.
Good luck!

there should be a drain plug under the mower near the shaft that the blade is connected to... good luck

First remove the spark plug wire from the spark plug. Then tilt the handles down to the ground. It helps to have something you can slide the handles under or otherwise hold them down. Underneath the mower deck there will be a drain plug. You are in front of the unit facing it the drain plug will be at about 7-o'clock a few inches from the cranckshaft. It will have a square hole in it. Use an extension on a 3/8ths drive ratchet in the square hole and remove the plug. Be careful not to cut yourself on the blade, I usually remove the blade first and sharpen it while the oil is draining. Loosening the dipstick from the tube on top will help it drain faster. When its done draining replace the plug and reinstall the blade if it was removed. Then refill from the dipstick tube. The unit will take approx. 22 ounces of oil. Do not overfill.

remove spark plug wire from plug,tip machine on its side.look under blade for a threaded plug with a square head where bottom of motor protrudes through deck.on most models you can simply tip machine over far enough to allow oil to drain out the dipstick[filler]tube.

Try putting a SMALL amount of gas in the carb and see if it will start, if it does, it is a fuel problem, if it does not it is probably an electrical one

This is a lawn mower catagorized as a chainsaw. We don't answer lawn mower questions ands you don't cut down trees.