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Old 11-11-2020, 08:23 AM   #6
slonomo
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Yamaha
 
Join Date: Oct 2009
Location: Medina, Ohio (NEOHIO)
Posts: 11,421
Default Re: EZGO 2 cycle drowning with fuel

I think there is a fuel delivery issue. Usually too much fuel means a carburetor that has a stuck or malfunctioning float. The fuel pump? Not sure how a bad fuel pump will pump more fuel, they usually pump less fuel when they fail. The carb float should stop the flow of fuel anyway. Unless the fuel is entering the engine from the vacuum pulse hose? Check that while cranking the engine. Pull the vacuum pulse hose off the engine and crank the engine, see if fuel is coming out from there, it should not. If it does, replace the fuel pump. Fuel should only come out of the hose that goes to the carburetor.

I suspect what happened is the old carb was dumping fuel into the engine and exhaust, filling up the crankcase and the muffler. Installing new carb didn't solve the problem because there was a ton of fuel in the crankcase and muffler still.

To check this, remove the fuel line from the carb. Remove the muffler/exhaust. Remove the spark plug. Run the starter/gen and see if fuel is coming out of the exhaust port. Run the starter/gen until you no longer see fuel coming out. This will expel most of the fuel from the crankcase. Leave the spark plug off and the exhaust off. Blow air from a fan directly at the exhaust port and leave it a few days to fully evaporate the fuel. BE CAREFUL, FUEL IS VERY FLAMABLE AND CAN CATCH FIRE FROM A SPARK! Keep a fire extinguisher handy and don't smoke or use any electrical devices. Do this OUTSIDE!

If the muffler is full of fuel, it needs to be burned off. Make yourself a nice fire with some really good dry wood. Burn the wood down until you see a huge pile of red coals. Take the muffler and set it on top of the coals and sit back and watch the show. The fuel and oil will burn off and flames will come out of the exhaust pipes. Hopefully your neighbors don't mind you fogging for mosquitoes. Keep that thing in the fire until no more smoke/flames are present. Let the muffler cool overnight and then blow compressed air through the muffler/pipes to get all the soot out. Reinstall.

Recheck your compression. Take some 2 cycle oil and put an ounce or so in the cylinder through the spark plug hole. Leave the plug out and cycle the engine for about 2 minutes. Then recheck your compression. Have a rag handy to catch all the oil coming out of the spark plug hole. A dry cylinder can give you a low compression reading. Adding a little oil helps to seal the cylinder up. If there was a ton of fuel flowing into the cylinder it is likely dry from all the gas in there. Gas is a solvent and will wash the oil right off the cylinder walls and piston rings.

Reinstall your new carb, new plug, new air filter with no fuel/oil on it. See if she runs. If not you might not have enough compression.
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