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I have a 2000 Mercury efi saltwater engine 250hp that is using well over a gallon of gas per mile-have changed all filters,high end fuel pump,strator and plugs-it seems to surge some at low speed and tops out at 5100 rpms now-had both oil and fuel filtered-any help would be good-thank you,David

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  • Anonymous Mar 22, 2014

    Engine idles ok slight roughness runs good at top end But mid range speed it's rough and cuts out but will pick back up without completely shutting down

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Sounds like a problem with your injector or injector sensors. One of the nice things about the EFI`s are the ability to hook up a diagnostic unit to the motor and then a tech at a merc dealership would be able to tell you exactly which sensor or injector is the problem

Posted on Apr 14, 2009

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Mercury boat motor troubleshooting


Could be a fuel issue. You don't say how old your motor is, but if it is 10 yrs or older, there is a good chance it does not process regular highway fuel very well. Too much ethanol. Makes the fuel separate after warming up. Your engine will normally start fine, but after getting warm, will either stall out at low speeds, or won't start after shutting down. Try a good additive to reduce the ethanol effect. Most boat docks with fuel pumps also sell the needed blend of gas for marine engines. Thus, a few more cents per gallon, but less problem for you. I mixed a good additive to my 20 yr old Johnson 115, and it runs like a new one! Hope this helps. Good luck !
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1 Answer

Where is the fuel filter on a 1978 mercury 500 50 h.p. out board motor located. im asking cause my boat works awesome until i get close to top speed it starts bogging out in 1 sec intervals and i dont know...


standard system is in the fuel pump on side of engine where the feed pipe comes in , very basic and i would fit a water seperating filter in the boat which is the size of an oil filter and saves stripping the carbs when you get dirt and water in your fuel ! check the diaphram is ok and not hard and no leaks !

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1996 90hp mercury idles rough


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Try removing plug clean regap, change fuel filter add some carberator cleaner and moisture eleminator to the gas.

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3.5 mercury outboard stalls when put into forward


hi take the prop off see if there is anything /string/ between the hub and the housing check oil lvel in g/box /is gear box nice and free if all is ok try it in ware with just a small amount of choke
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90hp mercury will start but not run


Check the wires leading to the CDI box for cracks or wear. Not there to know what is really going on but it could possibly be this or bad gas? drain gas and try some fresh stuff, also look for a good conditioner which will clean depots out of the carb. Hope this helps.

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2003 115 mercury efi losing power


I am a Mercury certified technician. What you need to do is take it to a Mercury dealer and have them hook it up to the computer. It sounds like the engine could be in Guardian mode or possibly a high RPM misfire. It is not something that is common and the computer program that Mercury has for those is able to test misfires and all sorts of cool stuff. It can also tell you if the engine was broke in properly, how many actual running hours are on it and even at what RPM each hour was ran. It will be able to bring up all faults that it has had in the past and any faults that are current. I know that you are probably looking for a quick, easy fix but for this problem I dont think that there is any way around taking the engine in. For what it is worth, if they charge you for more than 2 hours to run it on the computer then take it somewhere else. I can fully test the engine with the computer in about an hour. The only reason that it would take any longer is if they had to put it in the water to duplicate the problem but most shops will have a test tank that is capable of running your engine under a load at full throttle. Sorry for the bad news but I cant think of any other way and throwing new parts at it is just going to get expensive quick.

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