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Old 24 October 2005, 04:42   #1
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Mystery problem

A bit of a problem with my Yamaha F225, and I wonder if anyone has any ideas.

It has been running sweetly all summer, but yesterday afternoon on the Thames, picked up a builders bag on the prop. Immeditely went into neutral and removed the bag. This is not an unusual occurrence on the Thames.

Once cleared, off again and everything fine until 2 minutes later engine died. Cranked it over and it tried to run but wouldn't.

Quite a tide running so dropped the anchor and sitting in the middle of the river tried to get it going. I squeezed the fuel bulb and noticed it wasn't very firm bit after a few squeezes felt fuel in it. Tried engine again and ran for 30 seconds and then died. Did this several times but couldn't keep it running.

Luckily a passing RNLI life boat gave me a tow back to my mooring.

After 20 minutes tidying up and putting covers on etc, I tried the engine again, and it started and ran fine. I let it run for 5 minutes, revved it and every thing is fine.


My question is could this problem be related to the debris on prop incident, or is there anything I can do to check things, as bit hesitant to go out if this problem repeats itself especially if it was to happen on a busy stretch of river.

I thinks it's fuel related...the filter was new 6 months ago.

Any ideas gratefully received.

p.s. there was plenty of petrol in the tank!
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Old 24 October 2005, 05:14   #2
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I would replace the fuel bulb as it is cheep and as Bogi told me is a very common cause of fuel problems!
I was getting a same problem with my Opti & replaced the bulb, the old one would work only intermittently squeeze it & no suction, give it a shake & it would work again!
Also much cheaper than replacing the diaphragm in the fuel pump but hey we live & learn
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Old 24 October 2005, 06:33   #3
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It may have been the engine management system having a bit of a fit trying to protect your engine - sometimes they take a while to realise the problem has gone away!!!
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Old 24 October 2005, 06:52   #4
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Quote:
Originally Posted by Nick Hearne
I would replace the fuel bulb as it is cheep and as Bogi told me is a very common cause of fuel problems!
I was getting a same problem with my Opti & replaced the bulb, the old one would work only intermittently squeeze it & no suction, give it a shake & it would work again!
Also much cheaper than replacing the diaphragm in the fuel pump but hey we live & learn
I would definately recommend changing the fuel bulb if yours is not a genuine Yamaha / Quicksilver one.

My boat had a "Tempo" fuel bulb fitted and I've had numerous random shut downs. Apparently the Tempo bulbs, whilst looking good have a tendency for the shuttle valves to jam. - Runs ok now that a Quicksilver one is fitted
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Old 24 October 2005, 06:54   #5
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Quote:
Originally Posted by Searider
I would definately recommend changing the fuel bulb if yours is not a genuine Yamaha / Quicksilver one.

My boat had a "Tempo" fuel bulb fitted and I've had numerous random shut downs. Apparently the Tempo bulbs, whilst looking good have a tendency for the shuttle valves to jam. - Runs ok now that a Quicksilver one is fitted
Good job I replaced the Tempo with a Quicksilver one then
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Old 24 October 2005, 09:40   #6
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Thanks for the comments,

It's due for a service so I've booked it in. They concur that it could be the bulb, but lots of other things too.

Apparantly they will plug in a laptop and a full story will appear!
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Old 24 October 2005, 12:25   #7
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Laptop?

Quote:
Originally Posted by timw
Thanks for the comments,

It's due for a service so I've booked it in. They concur that it could be the bulb, but lots of other things too.

Apparantly they will plug in a laptop and a full story will appear!
Laptops aren't all they're cracked up to be. When I first was trying to find the cause of my cutting out I took the boat to my friendly Mariner dealer. He plugged in his Laptop (DDT actually) and noted that I had had 20 "almost" overheats - ie a bit "warm" but not enough to sound the alarm.
He spent all morning sorting out the overheats assuming that this had something to do with the cutting out. Took the boat away and problem still there
The cutting out got worse until the engine would not run at all. It was at this stage that the problem was discovered - there was no fuel in the engine but the bulb was solid.

New bulb for 7

Cheapest ever outboard motor bill
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Old 25 October 2005, 16:52   #8
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Replacing Fuel Bulb

Have had more than my share of fuel problems (water in fuel/tank and engine of course) this year. Now all resolved - pleased to say. However, when working on tank or putting seperator filters in etc - always had to draw fuel back up to bulb due to lots of air blocks and resulting in old petrol siphoning methods (i.e. a petrol mouth)! So how do U replace a bulb without introducing air?
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Old 25 October 2005, 17:16   #9
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Squeeze bulb, place thumb over open end of fuel hose, release bulb, release thumb, fuel starts moving up fuel line,continue and repeat. Replace engine connector when fuel appears at end of line.

Pete
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Old 25 October 2005, 19:22   #10
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Would that be a mark one thumb or the new type?
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