98 Mariner 200 EFI Offsore - Stops with no warning.

[JustCasting]

I have a 1998 Mariner 200 EFI Offsore motor on my boat. I have put a lot of hours on this boat since I bought it last Spring and the engine runs clean and strong.

I tore down the fuel pump and cleaned it last season. I also have replace the hoses and fuel bulb on the engine due to ethanal eating the old hoses.

About 2 weeks ago I started having some Bouging issues where the boat heisatated to accelerate and then with a surge take off and then run smooth at 3000 rpm and plane out.

I emptied the water seperator thinking I had some water in the gas.

Last weekend while taking a trip around NYC The engine just died with no warning. I turned the key it started right up and then about 3 minutes later again died. Again I turned the key and it started right up. This continued any time I had the boat running at speed. I ended up limping my way back 6 + miles and as long as I keep the boat under 7 miles an hour it would stay running.

I got home and I replaced the Water Filter and Gas Filter on the Engine still thinking water issues. I took the boat out last night to and ran from Greenwich to Rye. The engine was able to run at full power but the kill issue happened twice in about 3 miles. It then worked fine the remainder of the night at full power.

When the engine died I checked the Fuel bulb and it was solid, so it seams like I am getting a constant flow of fuel.

I was thinking it might be Electrical where a sensor is killing the engine. But no warning lights or buzzers sounding.

Has anybody ever seen this issue in a Merc/Mariner motor?

 

[Orbit Express]

Re: 98 Mariner 200 EFI Offsore - Stops with no warning.

Justcasting
reading about how many times your motor died just makes me want to cry.
I'd recommend to keep that from happening again, dig a hole about 6ft deep and bury that bad boy, problem solved. 4 stroke Yahama will give new life to your boat.

 

[Faztbullet]

Re: 98 Mariner 200 EFI Offsore - Stops with no warning.

From what your posting you could have high pressure pump problems,pressure/regulator problems,inlet needle sticking in VST tank, or a ECU problem. Check your fuel pressure 1st as it should be 37-39 psi and if wont reach this its a pump or regulator. Just ignore Orbit.....

 

[JustCasting]

Re: 98 Mariner 200 EFI Offsore - Stops with no warning.

Ok So I trouble shoot the Warning Buzzer not working when I turn the key. Bad Buzzer went down to boat store and got a new buzzer. Buzzer works now when I turn on the key. I also am adding a LED warning light on the dash that will light up when the buzzer goes off so I see it when I am driving.

Anyway I spoke to the mechanic while I was there. he confirmed it did not sound like a fuel problem. He said if I am able to get up to speed and run for a while if it was a fuel delivery problem it would stall out rough as the fuel pressure drops. He also thought it would have a hard time starting.

He said most of the scenarios like low oil, over heat, water in the fuel the computer makes the engine drop to low idel so you can limp back to the dock. So he did not think it be one of these.

If it shuts off like a switch with no warning it sounded Electrical. He said ussaly if its a loss connection the issue would not resolve itself consistently just by turning the key again to start the motor.

I am worried it's something to do with the computer.
Can the mechanic connect to the Engine computer and view logs. I would think it would log events like a car.

Does anybody have any other ideas?

 

[Faztbullet]

Re: 98 Mariner 200 EFI Offsore - Stops with no warning.

Only the 3.0 liter does that.... If he has a DDT he can read any stored codes, if you have a oil,water in fuel or overheat problem all the 2.5 liter ECU & modules will do is sound a alarm.

 

[cuefrog]

Re: 98 Mariner 200 EFI Offsore - Stops with no warning.

I'am having the same problem out of a 150 mariner magnum efi it starts fine and runs for about 4 min and shuts down as if you turned the key off but it will start right back up and run again for 3 or 4 min and dies. trying to solve but havnt found the cause.

 

[roozter2550]

Re: 98 Mariner 200 EFI Offsore - Stops with no warning.

makes me want to cry.
4 stroke Yahama will rot from the inside out in a few years with exhaust corrosion.

There...

fixed it for you.