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Old 08 August 2009, 12:13   #21
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There's a bloke up here with an evinrude, he can use it fine around the dock but as soon as he goes out the dock gate it losses all power. Comes back in and the power comes back. So tries again and as soon as he leaves the dock gates, no power. This is keeping it at the same revs all the time!
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Old 08 August 2009, 12:45   #22
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Quote:
Originally Posted by JSP View Post
There's a bloke up here with an evinrude, he can use it fine around the dock but as soon as he goes out the dock gate it losses all power. Comes back in and the power comes back. So tries again and as soon as he leaves the dock gates, no power. This is keeping it at the same revs all the time!
Simple ! Its one of 2 things , fuel or electrics - I dont charge for these pearls of wisdom !

does he keep running it when its not right ? if he does surely its just likely to do long term harm .

Any one on here running with long term problems .............?
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Old 08 August 2009, 12:52   #23
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Simple ! Its one of 2 things , fuel or electrics - I dont charge for these pearls of wisdom !

does he keep running it when its not right ? if he does surely its just likely to do long term harm .

Any one on here running with long term problems .............?
He's one that everyone just leaves well alone if you get what I mean.

Long term problems...me?.....naaaa
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Old 08 August 2009, 16:11   #24
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Went out today and checked all the things we earlier discussed - Fuel lines, breather, priming bulb - all looks good.
Now this may be irrelevant but I'm not sure - It only occurred to me an hour ago:- Everytime this happens I've went through the same procedure, either just filled the fuel tank or went out with a full tank of juice. After around the hour, the tank falls to around the 3/4 mark ish - then she cuts back to 4500rpm.
Or is this just coincidence??
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Old 08 August 2009, 16:20   #25
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From your description, that does sound like the tank cannot breath. The loss of about quarter of a tank would be about right for a strong vacuum to develope and therefore restrict the flow to the engine. Check out your breather tube and if unsure just replace it as it may have collapsed internally.
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Old 09 August 2009, 19:24   #26
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From your description, that does sound like the tank cannot breath. The loss of about quarter of a tank would be about right for a strong vacuum to develope and therefore restrict the flow to the engine. Check out your breather tube and if unsure just replace it as it may have collapsed internally.

Good call 250kts - The breather was sitting in a puddle and covered in dirt. I discovered it wrapped in a corner up behind the fuel tank. I removed it and blew through - there definitely was something in it so I re-routed it neatly out of the way.
After reading the posts the other day I went and bought fresh fuel line and primer bulb - So I changed it all today as well.
The primer bulb now goes rock hard when pressurized and is still pretty hard with the engine running.
Will take her out on Wednesday for a test spin - Fingers Crossed
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Old 13 August 2009, 05:00   #27
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This Saga Continues!!!!

Took the boat out yesterday - The engine still wont rev above 4,500rpm!!!!
The difference this time is that usually the motor performs well for an hour or so then cuts back - But this time she was under-performing from the onset. She was ticking over lovely and sounded well as we cruised out of the harbour, but when I went to power up she would only rev to 4,500RPM - She actually sounded choked!!!
It's definitely not the fuel supply as my previous post stated - new fuel hoses & Primer bulb (The bulb was rock hard when engine running!)
I then changed over to my spare fuel tank (with it own new hoses, primer bulb & fuel connection) - Still the same lack of power.

Where do I go from Here - HELP!!! I'm fast getting to wits end!
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Old 13 August 2009, 18:10   #28
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This may sound really silly Steve but I once installed the new fuel line the wrong way round and had identical symptoms to yours, check the arrow on the primer bulb. It cost me a trip to the local dealer to realise what a prat I was!!
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Old 14 August 2009, 04:51   #29
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This may sound really silly Steve but I once installed the new fuel line the wrong way round and had identical symptoms to yours, check the arrow on the primer bulb. It cost me a trip to the local dealer to realise what a prat I was!!



Hi, hatt11 - Just checked - Bulb correct way around. you're right, sometimes these problems are solved by something silly being wrong, if only this problem was as simple!
Next port of call - fuel pump - Carbs then Throttle Sensor.
Has any of you guys got any advice????


Steve.
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Old 14 August 2009, 10:50   #30
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Hi Steve I had same or similar last month on my 150 Mariner 2st. I renewed all the filters , plugs, checked the primer and stripped the carbs and flushed them!! But it turned out to be the diaphragm in the pump. Have you renewed it?

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