14.5 HP Briggs won't stay running.

t.crawford714 said:
I'm not arguing but why on earth is it called an anti dieseling solenoid? It runs on unleaded 87 haha. I'll check to see if there's a wire that looks like it would touch it, because now that you say that it only passes through the bowl and screws into the carb
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It has nothing to do with the gas type what so ever. The newer mowers for what ever reason, timing, idle speed, engine design?? after the ignition switch is turned off and no more spark at the spark plug the engine will keep running like a very sick diesel engine and that is why it is called a anti dieseling solenoid.
 
reynoldston said:
It has nothing to do with the gas type what so ever. The newer mowers for what ever reason, timing, idle speed, engine design?? after the ignition switch is turned off and no more spark at the spark plug the engine will keep running like a very sick diesel engine and that is why it is called a anti dieseling solenoid.
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Interesting! :thumbsup:
 
reynoldston said:
It has nothing to do with the gas type what so ever. The newer mowers for what ever reason, timing, idle speed, engine design?? after the ignition switch is turned off and no more spark at the spark plug the engine will keep running like a very sick diesel engine and that is why it is called a anti dieseling solenoid.
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Ah. So if it wouldn't plug the Carb it would still let fuel in and try to run like a diesel with trying to bust under pressure and a glow plug? That is pretty interesting.

So you're saying that without it being hooked up it's just plugging the Carb?
 
Yes that's the ant diesel solenoids job plugging the carburetor, but leave the glow plug out. A glow plug in a diesel engine is a electric element that gets hot and heats the compression chamber so it will stat easier.
 
I have had problems with some engines with the fuel shutoff solenoid. When the electricity is shut off, the spring tension pushes the plunger to shut off the fuel flow. When the ignition is on, the electromagnet is supposed to hold the plunger back letting fuel flow. Sometimes these fuel solenoids have intermittent problems particularly when the system voltage peaks and the engine is hot during a long run time. In one particular design I have had rusty looking silt buildup in the plunger cavity not letting the plunger retract fully and causing reduced fuel flow at high power demand. I have known of some that have cut the plunger off and reinstalling the solenoid with or without the electrical connector plugged in. I also know of some who have removed the solenoid and installed a plug of the correct threads in it's place. I know that these solenoids cost around $100 to replace.
The problem with governed small engines is that when the engine is shut off, the governor will sense the falling RPM and increase the throttle in an attempt to maintain the RPM selected by the throttle lever position. This puts raw fuel into the engine, some of which ends up in a hot muffler and a loud bang from flashing fuel sometimes results. This is one of the reasons for the fuel shutoff solenoid, the other being an emissions issue. Run on of a hot engine as this fuel passes thru sometimes does happen even with a correctly functioning shutoff solenoid.
Mad Mackie in CT:biggrin::laughing:
 
Well thanks guys! There was a male spade connector that was busted off on the inside. I couldn't get the spade out at the moment but at $100 I don't want to grind down the plunger or replace it. Tomorrow I'm grinding down a bolt to hold the bowl there and to see if it'll work. I'll make a few more attempts at pulling that spade out. I do have to say I'm now the small engines class genius. We have a new teacher that just came out of college and he didn't even know what the problem was.
 
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