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Author Topic:   Merc 225 EFI problem
Bpent posted 04-22-2002 09:00 PM ET (US)   Profile for Bpent   Send Email to Bpent  
While cruising along at 5000 rpm, the motor without any warning or hesitation completely shuts down. I put it back in neutral, turn the key and it starts back up and I can get under way again. This shut down happens every so often. Any ideas what could be causing this. I have new plugs installed and new fuel filters. Appreciate any help.


jimh posted 04-22-2002 11:22 PM ET (US)     Profile for jimh  Send Email to jimh     
Starting with the simplest explanation:
Check the kill switch. Perhaps it is intermittant or sitting right on the edge of operating.
Clark Roberts posted 04-23-2002 08:09 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Check for a fuel delivery problem! If not the kill switch (as mentioned above) it doesn't sound like electrical since that stuff doesn't fix itself. That leaves fuel as the likely cause. Could be a clogged filter, crimped hose, air leak in system somewhere, or that nasty check valve at fuel tank outlet (check to see if you have one of those and if so remove it!).. also if it is a fuel problem the engine is running lean for the instant it shuts down and "lean is mean" and a cyl can be scoured or piston holed... very quickly! Hope you chase the cause down and it's simple to fix! Happy Whalin'..' Clark.. SCN
Bpent posted 04-23-2002 01:25 PM ET (US)     Profile for Bpent  Send Email to Bpent     
Thanks for the input. I will check the things you guys mentioned. This is a great site.
phatwhaler posted 04-29-2002 05:35 PM ET (US)     Profile for phatwhaler  Send Email to phatwhaler     
Check the big ECM plug tht is clipped to the side of the EFI. There is a plastice collar that locks it together. I have seen two of these collars crack, and then the whole plug vibrates apart. It is nicely fixed by using four wire ties. One around each cable, and two pulling the whole assembly together.

phatwhaler out.

Bpent posted 05-05-2002 10:34 PM ET (US)     Profile for Bpent  Send Email to Bpent     
Problem Solved:
I found the negative terminal to the fuel pump loose. Making poor or no connection depending on the motor vibration. I installed two split ring washers and tightened the nut snug. The motor runs smooth and performs well.

Thanks again for input.

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