|
|
02 February 2011, 11:20
|
#1
|
Member
Country: UK - Wales
Make: Valiant
Length: 5m +
Engine: 75 Optimax
Join Date: Jun 2010
Posts: 108
|
2006 Mariner 115 EFI - Low fuel pressure.
Hi Guys,
I am completely out of ideas here and just testing the water to see if others have had a similar issue.
We have a 2006 Mariner 115 EFI in the shop at the moment, which is suffering from low fuel pressure. Under load the boat will not even climb to 4k RPM. After a short while, the boat will loose power and the RPM will drop to 2k-3k. At idle and out of the water she runs fine. Sometimes it stalls when shifting into forward gear.
I have inspected and re-fitted fuel lines, changed filters, run my own tank on the engine and even replaced the high pressure pump but no joy. Really wishing that someone has seen this before !
Thanks.
__________________
|
|
|
02 February 2011, 12:12
|
#2
|
Member
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
|
I had a similar problem on an F50 EFi, where the fuel connector at the front of the motor had cracked alongside the small square holes where the fuel passes through, causing air to be drawn into the fuel line by the low pressure pump. This in turn caused a reduced delivery to the VST. By fiddling with the fuel hose connector, I could make a good seal to the fitting, but once the boat was bouncing about at sea, the problem recurred.
May be worth a look.
__________________
|
|
|
02 February 2011, 13:21
|
#3
|
Member
Country: UK - Wales
Make: Valiant
Length: 5m +
Engine: 75 Optimax
Join Date: Jun 2010
Posts: 108
|
Thanks for the suggestion DHD.
Unfortunately if there is a leak, its somewhere deeper in the system.
To eliminate connections etc, I hooked my own fuel line directly to the low pressure pump.
__________________
|
|
|
02 February 2011, 14:14
|
#4
|
Member
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
|
Quote:
Originally Posted by Damien.
To eliminate connections etc, I hooked my own fuel line directly to the low pressure pump.
|
Yes, that's what I did on mine.
When you say 'suffering from low fuel pressure', do you mean on the low or high pressure side? I made the assumption that the pressure at the outlet of the low pressure pump is ok?
__________________
|
|
|
02 February 2011, 15:32
|
#5
|
Member
Country: UK - Scotland
Town: Girvan & Tayvallich
Boat name: Breawatch
Make: Ribcraft
Length: 5m +
Engine: Mercury 150 F/stroke
MMSI: ex directory!!
Join Date: Sep 2008
Posts: 6,203
|
Hi far be for me to advise a engineer but have you though of the diaphram, I had a similar problem with my 1997 V6 150 last year. Got started but would not go passed 4rpm on the run and would drop down to 2-3rpm.
Hope it helps.
__________________
jambo
'Carpe Diem'
Member of the ebay Blue RIB cover club
Member of SABS ( Scottish West Division)
|
|
|
02 February 2011, 16:46
|
#6
|
Member
Country: UK - Wales
Make: Valiant
Length: 5m +
Engine: 75 Optimax
Join Date: Jun 2010
Posts: 108
|
Its low on the high pressure rail.
and,
The diaphram inside of the low pressure pump has been serviced by myself.
I have a feeling I may have found part of the problem, worn injector seals. Part ordered, will let you guys know the result. Keep the suggestions coming though !
__________________
|
|
|
07 February 2011, 21:00
|
#7
|
Member
Country: UK - England
Town: Surrey
Length: no boat
Join Date: Feb 2009
Posts: 215
|
115 efi probs
Hi Damien , have you sorted your issue out yet??? OK if NOT then Im sure I can be of help to you. When you say low fuel pressure ??? what is the fuel pressure on the valve on top of the rail.Should be 40psi or so. Ok my next step with LOW fuel pressure would be to test the fuel pressure regulator ( this keeps the fuel pressure constant and stabelizes it) I have replaced a few of these babies in the past with low fuel pressure. Or dirt gets inside them. Check this first and let me know. Cheers
__________________
|
|
|
08 February 2011, 18:55
|
#8
|
Member
Country: UK - Wales
Make: Valiant
Length: 5m +
Engine: 75 Optimax
Join Date: Jun 2010
Posts: 108
|
Hi.
I think its sorted, the boat is booked for a water test next week.
Fuel pressure on the rail is now 40psi and shoots up to approx 70 psi when return hose is clamped on the regulator.
I noticed a small pressure leak on the injector seals, whapped on a new set and it seems to be behaving.
I will update soon.
Thanks.
__________________
|
|
|
09 February 2011, 20:38
|
#9
|
Member
Country: UK - Wales
Town: Black Wood
Make: Avon
Length: 8m +
Engine: Mercury Verado
Join Date: Feb 2011
Posts: 1
|
Being the main engineer for Quadra Boats i thought you would have been able to sort this one out!!
__________________
|
|
|
10 February 2011, 15:18
|
#10
|
Member
Country: UK - Wales
Town: N. Pembrokeshire
Boat name: Various
Make: RIBs & Hovercraft
Length: 9m +
Engine: Outboards
MMSI: Various
Join Date: May 2009
Posts: 1,358
|
Quote:
Originally Posted by dirtbox
Being the main engineer for Quadra Boats i thought you would have been able to sort this one out!!
|
First post.....
I don't understand , read the OP again!....Surely that's why we use forums like this....wealth of knowledge /assistance etc....can't see anything wrong with asking....
|
|
|
10 February 2011, 15:52
|
#11
|
Member
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
|
Quote:
Originally Posted by Razorbill RIBs
I don't understand
|
Possibly a pal of Damien's, using the forum to take the pi$$
__________________
|
|
|
10 February 2011, 15:58
|
#12
|
RIBnet admin team
Country: Ireland
Length: 4m +
Join Date: Feb 2008
Posts: 14,910
|
Quote:
Originally Posted by Razorbill RIBs
First post.....
|
Classy act. You'd almost think that Dirtbag had a professional axe to grind?
__________________
|
|
|
10 February 2011, 15:58
|
#13
|
Member
Country: UK - Wales
Town: N. Pembrokeshire
Boat name: Various
Make: RIBs & Hovercraft
Length: 9m +
Engine: Outboards
MMSI: Various
Join Date: May 2009
Posts: 1,358
|
Quote:
Originally Posted by Downhilldai
Possibly a pal of Damien's, using the forum to take the pi$$
|
True....
|
|
|
10 February 2011, 21:14
|
#14
|
Member
Country: UK - Wales
Town: west wales
Make: humber destroyer 5m
Length: 5m +
Engine: 90 yamaha
Join Date: Apr 2010
Posts: 202
|
The fact that the guy is the ''main engineer'' and is checking for other peoples experiences to save diagnostic time does him credit. None of us know everything.
Forums can save so much time and cost when diagnosing engine problems,there is a vast wealth of experience available just waiting to be called upon.Why not use it?
I know little about outboards but have 30 plus years of experience with automotive engines and letters after my name to prove it ,but I'm still learning every day.
Credit to the man for asking.
__________________
|
|
|
11 February 2011, 12:06
|
#15
|
Member
Country: UK - Wales
Make: Valiant
Length: 5m +
Engine: 75 Optimax
Join Date: Jun 2010
Posts: 108
|
Quote:
Originally Posted by dirtbox
Being the main engineer for Quadra Boats i thought you would have been able to sort this one out!!
|
Oh sorry pal, I forgot that the second I achieved the title "marine engineer" I automatically learned every single thing there is to know about marine engines and suddenly stopped caring about my customers interests, becoming so stubborn that I wouldn't ask for some advice or to see if anyone else had similar problems in the attempt to save my customer some money.
Damien.
__________________
|
|
|
11 February 2011, 18:40
|
#16
|
Member
Country: UK - Wales
Town: west wales
Make: humber destroyer 5m
Length: 5m +
Engine: 90 yamaha
Join Date: Apr 2010
Posts: 202
|
Damien
Are you having a pop at me or him?
I'm on your side on this
Bosun
__________________
|
|
|
11 February 2011, 18:58
|
#17
|
RIBnet admin team
Country: Ireland
Length: 4m +
Join Date: Feb 2008
Posts: 14,910
|
Quote:
Originally Posted by bosun
Damien
Are you having a pop at me or him?
I'm on your side on this
Bosun
|
Well, it was "quoted" at Dirtbag, so I think you're in the clear
I think Damo's post was a Masterpiece.
__________________
|
|
|
11 February 2011, 18:59
|
#18
|
Member
Country: UK - Wales
Town: N. Pembrokeshire
Boat name: Various
Make: RIBs & Hovercraft
Length: 9m +
Engine: Outboards
MMSI: Various
Join Date: May 2009
Posts: 1,358
|
Quote:
Originally Posted by bosun
Damien
Are you having a pop at me or him?
I'm on your side on this
Bosun
|
Def Dirtbox Bosun Thats who he's quoting.....
I sign up to Willks theory re prof axe to grind....pretty SAD to take the time to sign up in order to take a cheap (and unfounded) shot.....
|
|
|
11 February 2011, 19:16
|
#19
|
Member
Country: UK - Wales
Make: Valiant
Length: 5m +
Engine: 75 Optimax
Join Date: Jun 2010
Posts: 108
|
Quote:
Originally Posted by bosun
Damien
Are you having a pop at me or him?
I'm on your side on this
Bosun
|
Wasn't a dig at you fella.
My post was in response to the "pointless contribution to the board" winner.
__________________
|
|
|
11 February 2011, 19:17
|
#20
|
RIBnet admin team
Country: Ireland
Length: 4m +
Join Date: Feb 2008
Posts: 14,910
|
Quote:
Originally Posted by Damien.
My post was in response to the "pointless contribution to the board" winner.
|
When you're not busy fixin' injuns, you should post more
__________________
|
|
|
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
Recent Discussions |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|