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Author Topic:   Sudden Power Loss
minimontauk posted 06-30-2003 09:38 AM ET (US)   Profile for minimontauk   Send Email to minimontauk  
I had my 15' Sport CC out for a run this weekend. It has a 97' 48HP Johnson. It seemed to run a little rough at idle, but smooth enough at slow forward. I Opened it up to 90% throttle, sounded great, smooth acceleration, good water circulation. All of a sudden it lost power, like I was throttling back or running out of gas. The engine conked out. The fuel line pump bulb was soft, so I pumped it up hard again. I was able to restart immediately, but it ran on 1 cylinder intermittently for about a minute, then ran fine the rest of the trip. I opened it up again, no problems. This has happened twice now. Water in the gas? Clogged fuel filter? Failing fuel pump? Advice appreciated.
minimontauk posted 06-30-2003 09:41 AM ET (US)     Profile for minimontauk  Send Email to minimontauk     
Two other possible clues, I have brand new plugs in. The OMC shop manual shows an in-line fuel filter for this engine, but mine has none. The only apparent filter is the screen in the fuel pump itself.
Bigshot posted 06-30-2003 10:36 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Check all your fuel line fittings for leaks...air & gas. Then try another tank and hose if you can to eliminate that area. If still a no go....get a new diaphram for the fuel pump.
Jerry Townsend posted 06-30-2003 12:19 PM ET (US)     Profile for Jerry Townsend  Send Email to Jerry Townsend     
Minimontauck - I suspect that your fuel line may not have been fully primed the first time. Make sure that your bulb is really hard and let the engine run at idle for a couple of minutes. Positioning the bulb vertically really helps.

In my case (with a 115 Johnson), for the last couple of years, I might have to restart the engine after leaving the dock. This year just setting in the driveway, the engine would not start and I could not get the bulb really hard. The bulb was oriented horizontally and thinking the bulb was bad (after just about 5 years) I changed bulbs - same thing - nothing. Took the engine end of the hose off from the bulb and had gas on the first squeeze. There was not gas running from the hose or engine - so there was one culprit - air. I then simply moved things a bit so I could orient the bulb vertically when squeezing the bulb - presto - the bulb went hard after just a couple of squeezes and the engine fired right up.

Incidently, there was a thread some time ago regarding the positioning of the bulb - and the general concensus and guidance was to orient it vertically. ---- Jerry/Idaho

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