18 hp kohler quit running bacfires out muffler shoots fuel out of exhaust , and not getting fuel to cylinder at all

SOURCE: Blowing out gas at the start

No floats in chainsaw carbs. Severly flooded most common start problem with chainsaws. Read and follow the start procedure in your manual. Don't use choke on flooded engine (may set fast idle, set then turn off)!
Extreme Flooding by Dolfoff
Please follow this link, http://www.fixya.com/support/t3226410-no_spark_new_plug_but_continues_flood cursor down to “Best Solution”, while there click the “Was this helpful? [Yes]” button
Start Procedure
Cold:

1. Ignition on/off to on
2. Set compression release – optional step even if saw is equipped with a compression release
3. Pull (close) choke, set fast idle (done when choke closed on some saws); pull starter and listen for an attempt to start. once heard (usually two pulls)
4. Set compression release – optional step even if saw is equipped with a compression release
5. Push (open) choke pull starter until it starts. (usually first pull)

1. Ignition on/off to on
2. Set compression release – optional step even if saw is equipped with a compression release
3. Pull (close) choke, set fast idle (done when choke closed on some saws) - Don’t pull with choke closed.
4. Push (open) choke, pull starter until it starts. (usually first pull)

SOURCE: Have a Mac 3214, fuel lines were rotten, replaced

The fuel metering needle in the lower carburetor chamber may have a bad rubber tip or the rubber diaphragm may be hard or cracked. McCullough fuel tanks vent through the cap (it should not have a gasket). Gravity plays no part in the carburetor fuel volume. Remove the spark plug (ignition off) and pull the engine through a few times without the choke on, but the throttle wide open to remove excess fuel in the crankcase (no smoking during this procedure). Make sure the plug is dry when you put it back. Hope this helps!

SOURCE: husqvarna 51 died and wont restart

hi
if you have a good compression,a strong enough blue spark and carburetion for the fuel air mixture try priming the engine(put small amount of gas in the spark plug hole)then start the engine.If the engine runs only the gas you put inside the cilinder there is a carburetion problem to find and fix.
let me know regards savumihai71

SOURCE: poulan wild thing 18" Won't Start, Plug is wet

Check the air cleaner and muffler for plugging. Remove the carburetor, open the lower chamber and check the diaphragm for any holes or cracking. Also check the small fuel control valve that the diaphragm controls--either can cause flooding if not working properly. Hope this helps!

SOURCE: I have a Murray select

You said you drained the fuel tank so I'm assuming that there was fuel left there over the winter when it was not being used. If fuel is left in the lawnmower for a few months without it being used it can form a gel in the jets and/or the diaphram of the carburettor. I would think that this is the problem.

Depending on how bad the problem is you may be able to solve it yourself. Remove the sparkplug and pour around 5ml (one teaspoonful) of fuel into the opening. Dip the end of the sparkplug in fuel, so the spark gap is wet, and replace the plug. Try starting the lawnmower. The fuel you poured in should ignite and the engine turn over. This could **** the fuel through the carburettor and be enough to get it going. You may have to repeat the process 2 or 3 times. Don't be tempted to pour in more than the 5 ml of fuel or you'll flood the engine.

If this fails you'll need to take it to a mechanic to strip down the carburettor. I hope this helps.