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I have to put gas directly into carb for it to run,

I have or get white fluid at top of tube coming from engine. Also have to put gas directly into carb for it to run. The white fluid doesnt show up all the time.

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What you have is a very very wet climate! The engine is pushing the water out when you run it and it mixes with oil to become white and milky. As long as you change your oil every 25 hrs or so this shouldnt be a big problem. This wet condition is probably why you have to prime it by hand to start it as well. You need to remove the carbs bowl *(located on the bottom of the carb. It usually takes a half inch wrench to remove the bolt *(also the main jet) from the bowl.

Gently lower the bowl with your finger covering the hole where the bolt goes through so you can look at the fuel and see if you spot any water droplets in the fuel. Severe water will be a pool in the bottom of the bowl. You can then dump the fuel and look for water drops again.

If you find water in the fuel you should empty the entire fuel system and let it dry out. You can then put the bowl back on the carb and refill with fresh gas. Be sure the empty and dry your gas can too. They also accumulate water!

When this is all done. You might consider storing your mower higher off the ground or in a cool dry place.

Good luck and be careful!

Posted on Jul 16, 2010


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I had the same problem with my 190402 tiller engine (on a 1978 Sears RT-8 that my brother gave me). The carb leaked like crazy when I got the tiller, so I rebuilt the carb. Bought a new float, but the old one was fine (the hot water test you can read about if you do a Google search).

After rebuilding the carb and checking the float system (carb apart, hold carb top upside down with the float and needle installed, then blow into the gas inlet to see if you can pass some air. My carb top passed that test, and I guess it's a valid test. Never tried that one before . . .

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Take the old tube, grind off the threads (I used my Dremel tool). Get some lapping compound (I used water-based stuff from the local auto parts place). Put some compound on the seating part of the tube, insert the tube, and use a screwdriver to lap the tube against the carb seat. Check it every once in a while. I think I probably did it for 3 to 5 minutes, not very aggressively, and added compound one time.

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I haven't had any problems yet, and I've used the tiller for about 4 to 5 hours so far. Maybe 6 or 7, but I've been using it for about a month off and on.

If you want me to send the pdf version of Briggs' document regarding this fix, send an email to me at Just put in the subject line: Briggs Carb Fix. I'll shoot you a copy no problem.

Good luck.


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