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1st time for everything!

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Don Holden

05-21-2002 17:26:42




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The neighbor has a 14H/P Briggs O/H valve with very few hours on it! I offered to help him start it cause it has been sitting for about a year. The starter wouldn't spin the engine over & it appeared to be locked up. The cylindar was filled with fluid and when I took the plug out it puked a LOT of oil/gas out the plug hole. I got it running and it sounded good & smooth until it suddenly gushed a mixture of gas and oil out of the breather tube and flooded the engine. I removed the air cleaner and filter & restarted it. I inserted a rubber hose in the breather hole to catch any more fluid, and it constantly spits gas out of the breather tube while the engine is running. The engine runs fine while it is spitting the fuel out.This engine appears to have a solenoid on the bottom of the carb could this be the problem? I am really stumped with this one. I have never seen this problem before. I need the experts advice to help me fix this one.
Thanks for your help and suggestions.

Don Holden (The old retired guy)

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MOWMAN

05-22-2002 14:18:39




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 Re: 1st time for everything! in reply to Don Holden, 05-21-2002 17:26:42  
GUYS THAT IS AN AFTERFIRE SOLENOID, THE PURPOSE IS TO SHUT THE FUEL OFF TO THE MOTOR WHEN YOU TURN THE KEY OFF SO THAT YOU DONT GET A BIG BACKFIRE FROM THE MUFFLER AS THE GAS IS DUMPED INTO A HOT MUFFLER. WHAT HAS HAPPENED IN THIS CASE IS THAT THE FLOAT HAS EITHER STUCK OR BEEN FORCED OFF ITS SEAT THEN THE LEVEL OF GAS IN THE TANK FORCED ITS WAY PAST THE BREATHER IN THE CARB AND FILLED THE HEAD AND THE CRANKCASE WITH OLD GAS.LIKE THE OTHERS SAID THE ONLY WAY TO FIX IS CLEAN CARB DRAIN OIL AND START OVER ALSO PUT IN SHUT OFF VALVE WHAT HAPPENS THE GAS TANK CANT VENT THE PRESSURE SO IT BLOWS THE FLOAT OFF THE SEAT AND FILLS THE MOTOR WITH GAS, THE SOLENOID ONLY STOPS THE FLOW OF GAS THRU THE VENTURI!!!!!
THE FLOAT REGULATES THE GAS LEVEL IN THE CARB.
MOWMAN MST.

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GeneDavis

05-21-2002 20:16:11




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 Re: 1st time for everything! in reply to Don Holden, 05-21-2002 17:26:42  
The solenoid only cuts off the main fuel nozzle when you turn the key off . The spraying fuel out of carb and crankcase are a sure sign of float trouble either sticking or has a hole in it.. Running with gas in the oil will soon ruin an engine because it washes away the lubricant and will cause the connecting rod to sieze to the crankshaft. Gene



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buck

05-21-2002 17:41:46




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 Re: 1st time for everything! in reply to Don Holden, 05-21-2002 17:26:42  

that solonoid is suppost to cut the fuel off when the switch is off but doesn't always work or there are times when the switch may be left on for any number of reasons. Considering the time that this has been setting I would say that not only was the cylinder full of fuel but the entire crankcase is also full of fuel and this explains the oil/fuel mixture that is coming out of the breather tube.

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Don Holden

05-21-2002 18:37:05




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 Re: Re: 1st time for everything! in reply to buck, 05-21-2002 17:41:46  
Thanks for the reply Buck! Does the solonoid duplicate the function of the float in a regular carb? I don't understand why the engine runs so good and at the same time it continues to spit a fine mist of GAS out of the breather tube from the engine. If I were to disconnect the solonoid will the engine run for a short period of time? I have lots of questions so I hope you will have patience with the old guy!

Thanks Don

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buck

05-21-2002 20:17:01




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 Re: Re: Re: 1st time for everything! in reply to Don Holden, 05-21-2002 18:37:05  

considering that there is a single wire hooked to the solonoid then if you disconnect that wire while running then the fuel should be cut off and it will soon run out of fuel and die. Explain exactly what your are calling the breather tube. Have you checked the amount of fuel/oil in the crankcase. I got all kinds of time and most of what I know is from just messing around so if I can help I is happy.

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Donald Holden

05-21-2002 21:22:55




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 Re: Re: Re: Re: 1st time for everything! in reply to buck, 05-21-2002 20:17:01  
Buck, I removed the air filter, and I am referring to the tube that runs from the engines push rod cover located behind the carb to the base of the air cleaner just above the carb. I checked the oil and filled it to be sure there is sufficient oil in the crank case. I will energize the solonoid externally to see if it functions at all. I will also remove the carb and check the float as per Genes recommendation as I share his concern with the potential for failure do to running with contaminated oil. But,I am still fuzzy on how the fuel gets sucked in and then spits back out the tube and the engine runs beautifully. You would think it would run "rich" and act like it is being choked. I will give the carb a good going over and check out the electronics in the AM! I thank both of you for your interest and help. I will keep you posted on what I find to be the problem.

Don

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buck

05-21-2002 21:51:17




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 Re: Re: Re: Re: Re: 1st time for everything! in reply to Donald Holden, 05-21-2002 21:22:55  

first a word of caution here on checking and filling the crankcase. At times when the crankcase if full of gas the dipstick may appear as there is little to no oil in the engine when actually it is very full of oil that has be diluted with the gas that doesn't show well on the dipstick. I would suggest draining and refilling the crankcase with fresh oil. Now the gas and gas/oil that is comming out of the breather tube is actually comming from the crankcase and not the carb. Hopefully when the crankcase is at the proper level the situation at the breather tube will have been eliminated. Yes Gene's recommendations are very good ones and if I may take that one step further I would suggest that while you have your carb. of that you take it to your local small engine shop and ask for the proper parts to convert the fuel bowl to a bowl that does not use the solonoid. Again-hope this helps.

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terrence

05-01-2004 13:30:51




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 Re: Re: Re: Re: Re: Re: 1st time for everything! in reply to buck, 05-21-2002 21:51:17  
Hi Guys, I know this is an old conversation but I was wondering if I could jump in. I am having trouble with this same engine (Briggs& Stratton 14.5 HP DOHC) With the solenoid mounted at the bottom of the carburator fuel bowl. The engine will start and run fine for a few seconds when I shoot starting fluid into the air intake under the filter. However it seems to not be gettting any fuel to run once started. I took the bottom off the carburator and checked the float and jets etc. everything looks good. The fule line/filter are not blocked. I am afraid the the Solenoid is dead, and that it is preventing fuel from getting up from the fuel bowl into the carburator body. A new solenoid is kind of expensive and has to be special ordered. I am considering yanking it out and modifying/replacing the fuel bowl. I do not mind the occaisional backfire. It is an old tractor anyway. My question is, do you think it will run without the solenoid, and do you think it is necessary to install a manual shutoff on the gas line, or will the float/jet stop the flow when the tractor is off? Thanks Terrence

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Bob

05-22-2002 10:45:21




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 Re: Re: Re: Re: Re: Re: 1st time for everything! in reply to buck, 05-21-2002 21:51:17  
Another suggestion.. when you get it fixed, install a fuel shutoff valve ahead of the carb. in an accessable place, and when the tractor is not being used, shut the fuel off to prevent this from happening again.



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