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Joined: 3/16/2008
Posts: 17
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i have a problem that i could use some help with. i bought a bass boat in june and the motor ran fine, used it again in sept it ran fine, took it out oct 10,started up and a friend backed it off trailer and i parked the truck, came back and it was not running, he said it lost power and died, it would not start but would crank, after a few hours it started, took it out and it lost power and died after 50 feet, any suggestions on where to start would be helpful, if not might have to put in a shop to repair $$$$
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Joined: 11/21/2007
Posts: 459
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Don't know what type of boat you have but on my Lowe, the fuel line-the silver flex line, vibrated itself down beside the tank and got pinched. I replaced and re-routed the line and that cured that problem. I have had a couple of others but those were my fault.
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Joined: 11/19/2007
Posts: 416
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First, check the fuel lines to make sure it is getting gas. Next, check the spark plugs and make sure it is getting a spark. After you try that, let us know how it works. If it has a fuel filter, it could be plugged. Just a thought. Gary
Life Member, Retired WV State Police, Retired SFC US Army. Poca, West Virginia
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Joined: 3/16/2008
Posts: 17
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i checked lines and the plugs are firing and filters okay, i think my problem is the fuel pump, it is not strong enough to build enough pressure for the fuel injectors an does not hold pressure
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Joined: 11/19/2007
Posts: 180
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It certainly sounds like a fuel problem. Three things to look at then. Source (fuel tank), delivery (hoses/pump), and carburetor. I'm thinking carb myself if it isn't spewing out from a hole in the hose because it did initially run and then die. If it didn't initially run, then I'd suspect the fuel supply. Time to clean out the carb!
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Joined: 11/21/2007
Posts: 459
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I had a problem with my 50hp 4-stroke and it was a failure of the "vapor seporator". That was one pricey part.
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Joined: 7/3/2008
Posts: 40
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I had a similar problem with my 60HP Mariner outboard, the fellows here on this board helped me fix-it! See "Outbaord Motor Problem" a few posts down from this one> Rusty
NAFC Lifetime Member, BASS Member *
Everyone should believe in something, I believe I'll go Fishing!
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Joined: 1/31/2009
Posts: 1
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sounds like the float
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Joined: 11/19/2007
Posts: 1226
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Last fall I bought a used jonboat with a 15 hp Mariner on it....and the guy said that the only way the motor would stay running was if I tipped the external tank up a certain way. I went to a shop and asked the salesman / owner about it. It turned out that the short tube inside the tank that sucks up the fuel was dry rotted. I bought a replacment kit for it....and didn't have any more problems. I also bought a second tank to take out with me in case I ever have on the water problems with one tank (to include running out of gas).   One more thought...if you didn't have fuel stabilizer in with the gas (several brands out...I use Seafoam)...then MAYBE your fuel in the tank has degraded / separated. I hope you get the situation figured out soon.
Life Member David BB Linkmeister US Army '78-'85 West Central Wisconsin 
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Joined: 3/16/2008
Posts: 17
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thanks for all the suggestions
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Joined: 3/16/2008
Posts: 17
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to all those who gave me suggestion, finally took it to tracker in phoenix and they looked at it and diagnosed as oil build up in the fuel system, the lady did not know what caused it, i will have to get more answers when i pick it up, don't know if it was using cheap oil or just a build up over time, will let you know later
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Joined: 11/19/2007
Posts: 180
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Great to hear it has been figured out and thanks for the follow-up.
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Joined: 6/24/2009
Posts: 2
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I know you will find allot of ideas and they are all good, BUT being a true Mercury man I will tell you that Mercury has always had a Carb problem. If you are gental you can open up the bowls on the carbs and not break the gaskets.
Take and clean them with a can of B-12 carb. cleaner. You really should take them off the power head before you do this because the parts are small. Take photos as you go so there is no way that your reassembly will go wrong. This should clear any issues you are haveing. The needle and seat get gummed up with oil, stabelizer, dirt, and all you ever have to do is clean them. These parts very rarely ware out.
I also would sugest that you look over the wireing real well. Mercury has always had a problem with the outer coating of the wires (shielding) crumbeling. The trigger and the Stator are the first area to go. You can cut and change these leads with crimping on new wires. I have run into a problem with the stator that the leds for the spark are at the top of the power pack and the leds going to the block terminal are for charging the battery. You could be having intermentent issues withe your motor running and stoping when warm if the charging leds are bad. You can go with out them, just cut the leds (For the charger) off and get a battery tender (charger) for when at home. This will allow you to run like crazy without the issues, just make sure you have a seperate trolling battery so you are not draining your crank battery.
(Mild Works Marine Sallvage) Let me know if this works for you or not and I hope it halps ALL who read it.
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