I have a 8 hp Tecumseh engine on a snow blower. after about 10 minutes of run time, it starts to run rough and will spit gas out of the primer bulb. i have replaced the primer bulb, and have installed a rebuild kit with a new float, and I am still having this problem. Any answers would be appreciated. Thanks, Jeff

Change your filter. if that doesn't change it there are rebuild kits most small engines, hopefully yours is a Briggs motor those are the easiest to rebuild. if it's a Tecumseh you may have a little fun on your hands.

plug in Electric start. Push Choke to 'ON'. press Primer Bulb about 2 times. Turn Key to 'ON' Press Starter.
If you didn't run it completely dry of Gas last season I bet the Ethanol gas messed up your carburetor

you need to remove carb for cleaning... if it has an adjustment on the bottom of carb try turning it SLOWLY in and out... also possibly a screw on the side under a black cap... might try it as well engine model number would help here

Did you replace the fuel lines as well?; the rule of thumb is, when changing out the fuel lines- you should replace the primer bulb since they are a barometer of each others condition and wear.

If you did not remove the primer bulb from the carburetor when you were cleaning the component parts (and predicated that the primer bulb is mounted on the carburetor, as opposed to being mounted remotely from it)- the solvents used to clean the carburetor could have broken down the plastic or rubber material that makes up the primer bulb- hence suction leaks or complete failure.

If you did remove the bulb assembly, make sure you snugged everything up and there's a tight seal. I would still replace it anyway- they're inexpensive.

BTW, you mentioned you are using "fresh high grade fuel"- are you using premium grade gas? If so, save your money and use an 87 regular octane gas.

What you should be concerned with is- the use of ethanol. In many mid-western states, gasoline is blended with 10-15% ethanol- which can absorb water from the atmosphere and cause corrosion in the fuel system.

The money you save from buying regular unleaded could be used to buy a fuel stabilizer, which I highly recommend you use. Gas is only good for about 30 days and then the volatile compounds in it begin to evaporate- leaving brown gummy deposits that will eventually harden like varnish- which can plug up the fuel lines and carburetor.

Please let me know how you make out. Best wishes on your project.

The primer bulb may need replacing as they do crack with age and will not work. A small engine shop should fix you up .

Slightly unscrew the gas cap and see it the problem goes away.
Many times the Gas tank Vent clogs and this will cause the engine to create a vacuum in the gas tank until the engine can't draw in the gas .

Take off the screw that holds the carburetor bowl on and clean the holes with a needle and blow air through them. These holes feed gas from thr bowl into the carb and may be clogged.

check the fuel lines for cracks or holes and the primer bulb very common problems

try changing the plug may not be getting enough spark to start

The running time seems to indicate a plugged fuel tank vent. Try opening the cap to see if that will allow continued running. Many engines have the vent within the cap itself, while others vent from the air cleaner through a line. Ignore the fuel drip on the adjustment screw. Hope this helps!