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High RPM Power Loss https://www.smwebhead.com/phpBB3/viewtopic.php?f=5&t=12240	Page 1 of 1

Author:	LivinnSadley [ Tue Aug 27, 2013 1:05 pm ]
Post subject:	High RPM Power Loss
Hello All, once again I'm new to this forum so please give me any constructive critisim needed to get the advice I need and also to help anyone else I may be able to. My '93 Sundowner 215 has the OMC 5.0 EFI that runs like a champ until I hit about 30mph and then it just decelerates. Sometimes it continues to decelerate until I decide to let off the gas, sometimes it just quickly sputters and re-accelerates. It doesn't make any weird noises except for one time where it sounded like it may have backfired. I have taken the boat out about a dozen times this year and it has only done it the last 2 or 3 times. Again, it runs like a champ below 30mph. So far I have: Checked all fluids - was good Cleaned flame arrester - was fairly clean anyways Replaced fuel filter - some debris, no water Ran through about 10 gallons of gas with Sea Foam Plugs = 2 years old Any questions? Comments? Advice? Much appreciated,

Author:	rpengr [ Tue Aug 27, 2013 2:04 pm ]
Post subject:	Re: High RPM Power Loss
Yes, it sounds like fuel starvation (since you said it looses power but is not rough). Most likely is fuel pump. Lots of threads about fuel pump problems on this forum Other possibilities include: Anti-Siphon valve at fuel tank clogged Clogged fuel filter (but you already changed it) Leak in fuel line allowing air in (not likely without visible fuel leakage) Clogged fuel tank vent (not likely unless it takes a few minutes to loose power) Exhaust leak in engine compartment (causing oxygen starvation, not fuel starvation) Timing problem... vacuum hose broken going to distributor?

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