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Seadog
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Post Posted: Mon Apr 15, 2013 11:21 am    Post subject: Yamaha f70 cutting out

Hey all I have been having trouble with my motor last couple of trips. It runs good for ages but if I'm trawling after about an hour the motor just cuts out but when you start it up it will idle good but as soon as it is put in gear it cuts out again. I have to use the choke and rev the cr.p out of it then get up on the plane and then it's all good. Then after it starts doing it it will happen about every 15min when trawling or if the motor is just idleing. Starting to get annoying when it does it at shady mouth with heaps of other boats around. I have put a water seperater on to see if it was water also flushed out the cooling side of it but still doing it just seeing if any one would have any ideas

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Post Posted: Mon Apr 15, 2013 6:09 pm    Post subject: Re: Yamaha f70 cutting out

Have you checked your fuel filter seal? sounds like your fuel system isn't being pressurised enough sucking too much air and is causing the motor to starve at low revs. I had a similar problem and my filter wasn't screwed in all the way (after a service). Didn't notice it at high revs only when I was idling around; however, I did notice the smell of fuel vapours near the engine.


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Seadog
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Post Posted: Mon Apr 15, 2013 6:45 pm    Post subject: Re: Yamaha f70 cutting out

I will check that thanks also think I might change the fuel bulb thingy

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Post Posted: Sat Oct 27, 2018 12:20 pm    Post subject: Re: Yamaha f70 cutting out

I know its a 5 year old post however I am experiencing exactly the same problem with a F70. Wondering if you found a definitive answer. Im thinking its a fuel problem also - sucking air - replaced fuel lines and cant find any fault there.


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Seadog
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Post Posted: Sat Oct 27, 2018 12:24 pm    Post subject: Re: Yamaha f70 cutting out

there is a pipe that let's water past the fuel to cool it. mine was full of sand I just removed it and cleared out. never had another issue. PM if you need more help

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Post Posted: Sat Oct 27, 2018 1:13 pm    Post subject: Re: Yamaha f70 cutting out

Reckon hobbit might be on to it.
Had @ mate with a near new 100 hp yam. Had the same issue, after several trips to in and out thinking that they had solved it and then having it again on the next trip. They eventually solved it and it was as hobbit said.


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Post Posted: Sat Oct 27, 2018 4:35 pm    Post subject: Re: Yamaha f70 cutting out

okay thanks but cant find this pipe -The only water inlet that I can see that could get blocked with sand is the one above the gear box which is the main cooling intake (black plastic grate). Fuel is all up the top under cowling so figure I should be looking there. I can follow the fuel line in to the primary filter then fuel pump and then probably to high pressure injector pump etc.


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Seadog
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Post Posted: Sat Oct 27, 2018 6:32 pm    Post subject: Re: Yamaha f70 cutting out

it's at the back/top of high pressure pump.

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