Reply
 
Thread Tools Search this Thread
 
Old 28 July 2011, 12:54   #1
Member
 
Country: UK - England
Town: plymouth
Make: Ribtec
Length: 6m +
Engine: Mercury 175 optimax
Join Date: Feb 2008
Posts: 350
coughing and spluttering optimax

I have just tried to take my boat out today for a run; waiting for a service though did about 10 since my last one!

Anyway, changed the fuel filter on the engine myself and retightened hand tight and have fitted a new water separator as paranoid about water in fuel!

Anyway, started fine, ticked over fine and was ok around 5/10kts.

When we took it out and opened it up, it goes fine for a short while then coughs, spluts and misses like its starved of fuel..when you back off the throttle and throttle back up it goes fine then cough splutter. The separator is full and there is fuel in the bulb but I m reluctant to take it too far as I dont fancy rowing!

Any ideas?

Thanks
__________________

__________________
Miller is offline   Reply With Quote
Old 28 July 2011, 15:00   #2
RIBnet supporter
 
Pikey Dave's Avatar
 
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 7,596
RIBase
You could ask Martini
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4: See rule#5
Pikey Dave is offline   Reply With Quote
Old 28 July 2011, 15:23   #3
Member
 
martini's Avatar
 
Country: UK - Channel Islands
Town: jersey
Boat name: Martini II
Make: Arctic 28/FC470
Length: 8m +
Engine: twin 225Opti/50hp 2t
MMSI: 235067688
Join Date: Jun 2005
Posts: 3,021
Quote:
Originally Posted by Pikey Dave View Post
You could ask Martini
I know of some great Mercury techs in Paris, do you want their number?

As you say it does sound like a restriction in the fuel delivery but I can't see a reason why changing filters would cause it. Have you definitely used the right parts? Kinked a hose somewhere whilst doing the work? Can you hear the fuel pumps kick in when you turn the ignition on? And they run for around 3 secs then go off?
__________________
martini is offline   Reply With Quote
Old 28 July 2011, 16:04   #4
Member
 
Country: UK - England
Town: Warwickshire
Boat name: True Blue
Make: Humber ocean pro 6.3
Length: 6m +
Engine: Mercury 150 opti
Join Date: Oct 2005
Posts: 456
could be worth checking the seals on the new filters
__________________
Ian Sharlot is offline   Reply With Quote
Old 28 July 2011, 16:27   #5
Member
 
Country: UK - England
Town: plymouth
Make: Ribtec
Length: 6m +
Engine: Mercury 175 optimax
Join Date: Feb 2008
Posts: 350
I have checked the filter and there is no leak there...The pump runs when you turn the ignition on as well.

How about spark plugs? They were changed last year when it was serviced and its probably done 20 hrs since then at most...Is that a possibility?
__________________
Miller is offline   Reply With Quote
Old 28 July 2011, 16:57   #6
Member
 
Country: UK - England
Town: Gloucestershire
Boat name: Osprey
Make: Osprey Vipermax
Length: 5m +
Engine: E-tec 300 G2
MMSI: TBC
Join Date: Dec 2006
Posts: 4,013
I would run a jerry can to the engine bypassing all the filters. If it runs then you will need to work your way back from there to identify the restriction or leak.
__________________
---------------------------------------------------
Chris Stevens

Born fiddler
Chris is offline   Reply With Quote
Old 28 July 2011, 19:42   #7
Member
 
HUMBER P4VWL's Avatar
 
Country: UK - Wales
Town: N Wales Chester
Boat name: Mr Smith
Make: Humber
Length: 6m +
Join Date: Feb 2009
Posts: 5,013
Sounds stupid, but check the loom as it enters the engine. Ours after only 2 years had worn through where it enters the engine and turns/twists/creases. Basically when we opened up the throttle, then trimmed out, it creased and shorted a wire where it was worn.

Worth checking.
__________________
HUMBER P4VWL is offline   Reply With Quote
Old 29 July 2011, 02:58   #8
RIBnet supporter
 
Jizm's Avatar
 
Country: UK - England
Town: Southampton
Boat name: Hissing Sid
Make: Ross Smith Cobra
Length: 6m +
Engine: 200HP Optimax
MMSI: 235038046
Join Date: Jun 2002
Posts: 3,803
Quote:
Originally Posted by Miller View Post
The pump runs when you turn the ignition on as well.
Remember there are 2 electric pumps, high and low pressure.
Is this anything like your symptoms?

Jizm is offline   Reply With Quote
Old 29 July 2011, 07:02   #9
Member
 
Country: UK - England
Town: plymouth
Make: Ribtec
Length: 6m +
Engine: Mercury 175 optimax
Join Date: Feb 2008
Posts: 350
Quote:
Originally Posted by Jizm View Post
Remember there are 2 electric pumps, high and low pressure.
Is this anything like your symptoms?

hmm, not quite it goes for a lot longer at full throttle before it starts to struggle...

First thing i ll try is the external tank as it took me ages to get the ball primed in the first place.
__________________
Miller is offline   Reply With Quote
Old 29 July 2011, 09:15   #10
RIBnet supporter
 
Jizm's Avatar
 
Country: UK - England
Town: Southampton
Boat name: Hissing Sid
Make: Ross Smith Cobra
Length: 6m +
Engine: 200HP Optimax
MMSI: 235038046
Join Date: Jun 2002
Posts: 3,803
Indeed, they don't much like sucking up air....
__________________

Jizm is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 08:13.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.