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Old 22 September 2013, 14:40   #1
Country: UK - England
Length: 3m +
Join Date: May 2010
Posts: 12
Mercury 8hp Cutting Out?

Hi - my 8hp Mercury (4 stroke) has been cutting out a bit on the water lately.

So....Its going along no probs - then it splutters and dies. I then give the bulb on the fuel line to the external tank a squeeze and its all good again and starts no problem.

Or....If I catch it as it splutters and throttle back and pump the bulb, it comes back to life.

The bulb also feels 'soft' at the point it splutters.

It did this a bit last year too before its service, so I brought a new tank, fuel line, bulb. I guess the fuel filter would have been done at service. Its been fine for quite a while before it started playing up.

So any suggestions - Could it be the fuel pump?


Rupe is offline   Reply With Quote
Old 22 September 2013, 14:49   #2
Country: UK - England
Length: 3m +
Join Date: Sep 2008
Posts: 2,464
Yes is the short answer. Its either air getting in or the pump (probably diaphragm). You've ruled out most of the places air can get in...

ShinyShoe is offline   Reply With Quote
Old 22 September 2013, 15:25   #3
spartacus's Avatar
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 60hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 3,649
Examine the Mercury fuel connectors. Had a similar problem with a Tohatsu connector that needed lubed. If that checks out okay, might be worth renewing the fuel pump. I'm sure Mercury make a kit with new diagraphms, gaskets, etc.
Is that with or without VAT?
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