98 200 EFI Quits Running

[orgedude55]

98 200 EFI Mercury quits running like key shut off. Instant re-start test result. Pulse pump PSI 4-6lbs. (pump re-built) Electric pump 35 PSI. Electric pump amp draw 4.5 to 5.0 amp. 4.5 at idle 5amp 4000 rpm (no load). All fuel lines have been replaced. Primer bulb replaced, final filter cleanded, float level & needle checked, water seperating filter replaced.<br />Installed fuel guage to shrader valve just before it quits running psi drops.<br />Installed DMM in B+ lead to Electric fuel pump, no problem.<br />Installed DMM to ground circuit at pump. ECU is turning off ground just before it quits.<br />All this only happening when in the water at 1100 to 1500 RPM.<br />Charging system voltage 13.5 at 4000 12.5 to 12.8 at idle.

 

[JB]

Re: 98 200 EFI Quits Running

Merc Trouble.

 

[Garydean]

Re: 98 200 EFI Quits Running

I had the same problem and had it in the shop several times with no fix. Check your voltage regulators . If you pull them off, the older ones had a clear resin that you could see through on the back and see burn marks inside them. On mine I kept asking every mechanic I came across what would cause the engine to die like you turned off the key. finally one said the efi's will shut off if you have an under voltage, so I remembered that my Lowrance fish finder had a setting that I could watch the voltage while running and I found that there was an overvoltage, up to 18 Volts and that is when it would shut off. It was very intermittent but I did end up frying my computer and an optima battery before I found out what it was. It is also really inconvenient when you are running up a river in 1 foot of water and it dies. I hope this helps you.

 

[mistylady]

Re: 98 200 EFI Quits Running

i had the same problem. it was the engine wire harness coming loose. spread the pins a little and used tape to secure the harness. never had that problem again. hope this helps.