140 merc.engine shuts down

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GRM

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Jul 5, 2002
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1985 140 merc. engine shuts down after 15 to20min. of running.Ican be running fast or slow, does not matter.But it will start right up again? I have changed, plugs,dis. cap.points,rotor,condenser,fuel pump filter, and carb filter,and blowed out line. Ran great for one day then started again the stalling the next day.Could it be from the gas tank?
 
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rami

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Jul 17, 2002
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Re: 140 merc.engine shuts down

you might want to try dry gas in the gas tank, you can get it at any auto parts store. It sounds to me like you may have water in the gas line, not sure, but this is an easy way to find out. Hope this helps...
 
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DJ

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Re: 140 merc.engine shuts down

GRM,<br /><br />Determine if it has spark when it shuts down. <br /><br />You could be overheating your ignition coil by supplying 12 volts to it. It should only get about 9.5 volts.
 
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Walter

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Jul 3, 2001
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787
Re: 140 merc.engine shuts down

My experience has shown that in most cases an engine that dies from fuel starvation will sputter, cough...whatever...before dying. It may also require some extra cranking to get it running again. It sounds to me like your problem may be electrical. DJohns is correct in saying you need to identify whether your ignition circuit is still "live" when the engine shuts down. These intermittent problems are often times difficult to troubleshoot... However, as long as it continues to fail...you can find it and fix it. Unfortunately, sometimes you "fix" the problem without really knowing it as you go about troubleshooting. I'm talking about poor connections in your ignition circuit etc... As you look for the problem, you may take apart a gang plug...or move a wire loom where the poor connection exists...and everything works great...for a while. For this reason, I'd suggest while it's still failing that you don't mess around with doing anything else...rather you do just as DJohns said...see if you're still getting spark when it dies. If it were me...I'd connect a volt meter (not a "test" light) to the positive side of the coil. Do you ever lose the approx. 9.5 volts when the engine dies? If so, then it's time to thoroughly inspect your ignition circuits. Heck, you may find it's something as simple as a bad key switch...or emergency kill switch...or poor engine harness connection...or...or...or... Did I say "simple"?<br /><br />Good luck...and let us know how things work out.<br /><br />Walt
 
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