Reply
 
Thread Tools Search this Thread
 
Old 11 May 2011, 14:28   #1
Member
 
Country: UK - England
Length: 5m +
Join Date: May 2011
Posts: 2
Mariner 60hp 4 stroke EFI 2003

After about 20 minutes of running, engine starts to die. I can keep it running normally by pumping bulb almost constantly. Have tried different fuel tanks, new fuel line and renewed both fuel filters. Replaced mechanical fuel pump twice, thinking maybe first fuel pump was faulty, have also ran fuel line straight to fuel pump to rule out sucking air but problem is still there. Wondering if anyone has had same problem or has any idea what is causing this please.
__________________

__________________
dreamfish is offline   Reply With Quote
Old 11 May 2011, 15:55   #2
RIBnet admin team
 
Nos4r2's Avatar
 
Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,645
RIBase
Have you tried a different black box?
__________________
Need spares,consoles,consumables,hire,training or even a new boat?

Please click HERE and HERE and support our Trade Members.

Join up as a Trade member or Supporter HERE
Nos4r2 is offline   Reply With Quote
Old 11 May 2011, 16:43   #3
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
Perhaps the float valve in the Vapour Separating Tank needs looking at?
__________________
Downhilldai is offline   Reply With Quote
Old 11 May 2011, 17:38   #4
Member
 
Country: UK - Wales
Make: Valiant
Length: 5m +
Engine: 75 Optimax
Join Date: Jun 2010
Posts: 108
I would be inclined to look at the electric fuel pump.

It sounds like the pump is failing to supply the engine with sufficient fuel pressure, which you are compensating when priming the bulb.

Can you put your hands on a fuel pressure gauge ?

Also a complete stab in the dark her but can you simulate the problem while stationary ? If so, measure voltage at the pump when the engine is dying.
__________________
Damien. is offline   Reply With Quote
Old 11 May 2011, 17:54   #5
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
Quote:
Originally Posted by Damien. View Post
I would be inclined to look at the electric fuel pump.

It sounds like the pump is failing to supply the engine with sufficient fuel pressure, which you are compensating when priming the bulb.
I wondered about that, but thought the electric pump is probably ok as the motor runs for 20 minutes before the symptoms set in.
__________________
Downhilldai is offline   Reply With Quote
Old 11 May 2011, 18:00   #6
Member
 
Country: UK - Wales
Make: Valiant
Length: 5m +
Engine: 75 Optimax
Join Date: Jun 2010
Posts: 108
True, but not worth ruling out.

Ideally we could do with some fuel pressures and voltages otherwise we could be reeling off possible causes all night long.



Alot of the time this type of problem is down to a vent on the tank or blocked pick up but it seems the OP has eliminated the before engine supply.
__________________
Damien. is offline   Reply With Quote
Old 11 May 2011, 18:19   #7
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
Quote:
Originally Posted by Damien. View Post
True, but not worth ruling out.

Ideally we could do with some fuel pressures and voltages otherwise we could be reeling off possible causes all night long.



Alot of the time this type of problem is down to a vent on the tank or blocked pick up but it seems the OP has eliminated the before engine supply.
Yep, armchair diagnosis from 200 miles away.
__________________
Downhilldai is offline   Reply With Quote
Old 11 May 2011, 19:10   #8
Member
 
Country: UK - Scotland
Town: Port Logan
Boat name: Red Fox
Make: Zodiac Pro 500
Length: 4m +
Engine: Yamaha 70hp
MMSI: 232004329
Join Date: Aug 2002
Posts: 322
Get it to an authorised service dealer and tell them. They will plug it in to the computer and sort the fault in no time.
__________________
Red Fox is offline   Reply With Quote
Old 12 May 2011, 07:40   #9
Member
 
Country: UK - England
Length: 5m +
Join Date: May 2011
Posts: 2
Thank you all for your replies. I am now on my third mechanic with this engine, (he is looking at it today,hopefully!) the vapour seperator tank has been stripped and cleaned. it has been connected to computer and showed no faults. I have been told fuel pressures are ok. Nos4r2 what is the black box?
__________________
dreamfish is offline   Reply With Quote
Old 12 May 2011, 08:56   #10
Member
 
Country: UK - England
Town: Looe
Make: Delta
Length: 4m +
Engine: Mercury
Join Date: Apr 2004
Posts: 1,335
I dont think the computer will find a fault. i would get your nearest dealer to put a fuel pressure gauge on it, and see whats going on, check if your maintaining fuel pressure. The Laptop wont read fuel pressure.
__________________

__________________
Black Dog Marine
www.blackdogmarine.com
Turbodiesel 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 00:34.


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