On my last trip to the lake last summer, my 2002 21V with a 350 Merc MPI started falling on its face when put under load halfway through the day. I had it winterized, fuel filter changed, etc. This year I put the boat in the water, she starts fine, revs in idle, backs off the trailer, but dies as I get above 5 or 6 mph. A double beep sounds. If I pull the throttle back, it will usually stay running, but if I leave it, the engine knocks and dies. My thoughts are: water in the gas after being left out in the winter. I had a cover, but water still manages to accumulate in the boat. However, I don't understand the double beep. I unfortunately left the tank half-full over the winter, but with Stabil. I put about 10 gallons in and some Iso-Heet before this last trip hoping to burn off any water. Any suggestions? Will I need to take it in to get the code read? or can I disconnect the battery?
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My guess would be the fuel pump, working enough to idle, but as soon as you give it gas - well you know the rest. -
gas pump easy to check, you can pull off the hose to the intake, you shoul dhave gas pumping out pretty hard, if you dont hear it clicking, you have a problem, easy to change~ 2 hours and $150 for the pump.Comment
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Relay
Cheapest first, replace the 25 dollar hella fuel pump relay on the top right of the engine... Since there are 2 identical relays next to each other, you can swap them around to see if that eliminates your problem. If it doesn't move onto the pump R&R.Boating Lake Mead since 2000Comment
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Turned out to be the idle air control. Cheap fix!Comment
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