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Old 21 August 2019, 14:57   #1
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New Outboard Problems - help please

Hi Guys,

I have recently purchased a new 6hp Mercury to go with my new boat.

Took it out today for the first time, all was well for the first hour.

A few miles down the Trent from Sawley the outboard cut out.

Could not get it stated again, spoke to the helpful guy who sold it to me but no joy for about 45 mins.

Then got it started with the throttle turned to 100% no choke, ran for 5 mins, before it cut out again while slowing down to the slowest speed.

Got a tow back up to Sawley Marina from friendly Narrow boater.

Started it again in the Marina and it ran fine going slow for another 30 mins before I went home.

I was using the internal tank, had the fuel position correct, had fuel in, had the kill cord on. Spark plug was dry, but quite black.

Any ideas what could be causing the issue, seems to be going from 40% throttle to the slowest that causes it but not really sure?

Thank you.
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Old 21 August 2019, 15:13   #2
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Sounds like it was running on choke or there is an air blockage
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Old 21 August 2019, 15:20   #3
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Nope, choke was not on. Air in the fuel system?
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Old 21 August 2019, 15:36   #4
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Tank air vent open?
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Old 21 August 2019, 15:40   #5
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Was it brand new out of the box and never run before or just newish?

I had a very similar set of behaviours with a few months old Mercury 9.9 when the idle and low speed jets/ports suffered blockages. It was initially erratic... misbehaving then going OKish then running badly again before finally doing the needing full throttle to start thing then dying as soon as it was dropped to a speed low enough to engage gear.

The one simple "did you" I'd add would be... did you open the tank air bleed?

Edit: Willk just beat me to the tank vent.
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Old 21 August 2019, 16:02   #6
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Quote:
Originally Posted by Fenlander View Post
Edit: Willk just beat me to the tank vent.
...and I ask only because I did this recently

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Old 21 August 2019, 16:18   #7
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Yep, tank air bleed valve was open. Yes brand new, was tested by the Marina I bought it from before I took it away though.
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Old 21 August 2019, 17:36   #8
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If only using the internal tank, close lever at front fuel cock side, remove the hose that exits the fuel cock and place a rag under it, remove the tank's cap and move the fuel lever back to ON/start position.

Fuel should exit with no restrictopn whatsoever, if restricted unscrew the round filter located under the fuel cock and clean it to immaculate clean cond. Re assemble flter back, test motor and report if starvation issue was totally cancelled.

Debris could have made its way down with fuel clogging the internal round filter, a good procedure to start fuel starvation troubleshooting.

Happy Boating
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Old 21 August 2019, 18:36   #9
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It's brand new. It's warrantied.

Take it back before you void the warranty.
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Old 22 August 2019, 03:26   #10
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It's brand new. It's warrantied.

Take it back before you void the warranty.
+1

This is their problem not yours...
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