Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 08-07-2011, 14:52   #1
Registered User
 
Janae's Avatar

Join Date: Nov 2010
Location: Perpetually roaming
Boat: Sold our 1974 27' Ericson
Posts: 59
At My Wit's End with My 2001 Mercury 5hp Two-Stoke Outboard !

It's in great condition - other than the fact that I can't get the damned thing to run right.

We have continuous problems with flooding. We've recently replaced the filter, and the float needle.

We use high quality gas (ethanol free), 50:1 synthetic marine 2 cycle oil mixture as well.

We've taken the carburetor apart half a dozen times now. Thoroughly cleaned it out each time. Replaced the gas inside. Made sure there were no holes in anything, no leaks, no blockages, etc. It looks like it should be running like a dream.

However, it's always flooding. The float valve and needle appear to be working fine, in the right position, not sticking.

It's a 50/50 that can get it to start. If we don't flood it on start, we have to manually regulate the external fuel valve on the outside of the cowling to prevent it from flooding while it's running. This means, every 30 seconds or so, opening the valve for a second to allow some fuel to come in.

I'm not sure where to go from here. Rebuild kit? In my mind, flooding would suggest issues with needle/float valve - but we just replaced those. They APPEAR to be in the right position, not sticking, etc.

Does anyone have any words of wisdom?
__________________

__________________
I see my path, but I have yet to know where it leads. Not knowing where I'm going is what inspires me to travel it.
Janae is offline   Reply With Quote
Old 08-07-2011, 14:57   #2
Registered User

Join Date: Dec 2008
Location: ontario canada
Boat: grampian 26
Posts: 1,743
Re: At my wits end with my 2001 Mercury 5HP 2 stoke outboard!

Check your float level for starters and make sure there isn't a hole in the float allowing fuel in.
__________________

__________________
perchance is offline   Reply With Quote
Old 08-07-2011, 14:59   #3
Long Range Cruiser
 
MarkJ's Avatar

Cruisers Forum Supporter

Join Date: Dec 2007
Location: Australian living on "Sea Life" currently in England.
Boat: Beneteau 393 "Sea Life"
Posts: 12,828
Images: 25
Re: At my wits end with my 2001 Mercury 5HP 2 stoke outboard!

What sort of fuel tank is it?

Plastic?

Does it bulge out in the heat of the day?

Damn thing does that to mine and floods the OB.

So I disconnect the fuel hose unless its running, start without it on, and undo the air vent.

Don't know if this will help
__________________
Notes on a Circumnavigation.
OurLifeAtSea.com

Somalia Pirates and our Convoy
MarkJ is offline   Reply With Quote
Old 08-07-2011, 15:02   #4
Registered User
 
Janae's Avatar

Join Date: Nov 2010
Location: Perpetually roaming
Boat: Sold our 1974 27' Ericson
Posts: 59
Re: At my wits end with my 2001 Mercury 5HP 2 stoke outboard!

Quote:
Originally Posted by perchance View Post
Check your float level for starters and make sure there isn't a hole in the float allowing fuel in.
No hole in the float. When the carb is apart, it sits level.
__________________
I see my path, but I have yet to know where it leads. Not knowing where I'm going is what inspires me to travel it.
Janae is offline   Reply With Quote
Old 08-07-2011, 15:05   #5
Registered User
 
Janae's Avatar

Join Date: Nov 2010
Location: Perpetually roaming
Boat: Sold our 1974 27' Ericson
Posts: 59
Re: At my wits end with my 2001 Mercury 5HP 2 stoke outboard!

Quote:
Originally Posted by MarkJ View Post
What sort of fuel tank is it?

Plastic?

Does it bulge out in the heat of the day?

Damn thing does that to mine and floods the OB.

So I disconnect the fuel hose unless its running, start without it on, and undo the air vent.

Don't know if this will help
I should have specified that it's an internal fuel tank. Also, I should mention that we've also checked the fuel lines and tank for contaminants.

Thanks for the suggestion though!
__________________
I see my path, but I have yet to know where it leads. Not knowing where I'm going is what inspires me to travel it.
Janae is offline   Reply With Quote
Old 08-07-2011, 15:21   #6
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2007
Location: Santa Cruz
Boat: Boatless Again
Posts: 4,330
Re: At my wits end with my 2001 Mercury 5HP 2 stoke outboard!

There is still something wrong with your float valve. Take carb off, drain, attach a hose to the fuel inlet and blow air in while inverting the carb. The air flow should cut off completely and dependably when its upside down.

If the internal tank vent is blocked and it is pressurizing in the sun, try leaving the fill cap loose.
__________________
donradcliffe is online now   Reply With Quote
Old 08-07-2011, 15:26   #7
Registered User
 
brutb's Avatar

Join Date: Feb 2011
Location: Cocoa, FL
Boat: Wittholz 39' Cutter by Kanter, CSY 37 Cutter
Posts: 598
Images: 4
Re: At my wits end with my 2001 Mercury 5HP 2 stoke outboard!

Does your motor have a diagphram fuel pump, if so check it.
__________________
brutb is offline   Reply With Quote
Old 08-07-2011, 15:34   #8
Registered User

Join Date: Feb 2009
Posts: 1,848
Re: At my wits end with my 2001 Mercury 5HP 2 stoke outboard!

yes fuel pump would be where i would start
__________________
motion30 is offline   Reply With Quote
Old 08-07-2011, 15:50   #9
Do… or do not
 
s/v Jedi's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 9,198
Re: At my wits end with my 2001 Mercury 5HP 2 stoke outboard!

Quote:
Originally Posted by motion30 View Post
yes fuel pump would be where i would start
Internal tank? I think they are gravity feeding...

The only weirdness I know of with Merc 2-strokes is that the 2-cyl 8-15hp have this coil for ignition that can drive you mad when it's defect because the motor runs fine in tank tests... only under load it starts to suffer.

ciao!
Nick.
__________________
s/v Jedi is offline   Reply With Quote
Old 08-07-2011, 16:00   #10
Senior Cruiser
 
Blue Stocking's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: St. Georges, Bda
Boat: Rhodes Reliant 41ft
Posts: 4,117
Re: At my wits end with my 2001 Mercury 5HP 2 stoke outboard!

Quote:
Originally Posted by s/v Jedi View Post
Internal tank? I think they are gravity feeding...

The only weirdness I know of with Merc 2-strokes is that the 2-cyl 8-15hp have this coil for ignition that can drive you mad when it's defect because the motor runs fine in tank tests... only under load it starts to suffer.

ciao!
Nick.
Have the same problem (coil) with my 2005 1.5kw yamaha.
It was designed in Outer Mongolia, by French Foriegn Legionaires, to be used as a helicopter motor on the west face of the Andes--or some sh*t like that when I talk to the techs.
__________________
so many projects--so little time !!
Blue Stocking is offline   Reply With Quote
Old 08-07-2011, 16:05   #11
Do… or do not
 
s/v Jedi's Avatar

Cruisers Forum Supporter

Join Date: Feb 2009
Location: in paradise
Boat: Sundeer 64
Posts: 9,198
Re: At my wits end with my 2001 Mercury 5HP 2 stoke outboard!

Quote:
Originally Posted by Blue Stocking View Post
Have the same problem (coil) with my 2005 1.5kw yamaha.
It was designed in Outer Mongolia, by French Foriegn Legionaires, to be used as a helicopter motor on the west face of the Andes--or some sh*t like that when I talk to the techs.
Yes, I posted that because it is sometimes so misdiagnosed. But I don't know which outboards have that coil and which don't...

ciao!
Nick.
__________________
s/v Jedi is offline   Reply With Quote
Old 08-07-2011, 16:24   #12
Moderator
 
cabo_sailor's Avatar

Cruisers Forum Supporter

Join Date: Mar 2008
Location: Tarpon Springs FL
Boat: Cabo Rico 38
Posts: 1,905
Re: At my wits end with my 2001 Mercury 5HP 2 stoke outboard!

It's not an outboard motor but I have a gas pressure washer that was doing the same thing. I finally determined that even though the float was up, the attached needle valve was letting copious quantities of fuel past, even in the shutoff position. After messing with it for an afternoon I found a whole new carb was only about $30. That's the route I took.

So perhaps a close look at the needle valve controlled by the float is in order. A small piece of grit or sand could be preventing it from sealing when the float is up and in the closed position.

Rich
__________________
cabo_sailor is offline   Reply With Quote
Old 08-07-2011, 16:25   #13
Registered User

Join Date: Feb 2009
Posts: 1,848
Re: At my wits end with my 2001 Mercury 5HP 2 stoke outboard!

If that merc is made by tohatsu which think it is, there is a fuel pump on the carb There is a carb rebuild kit which includes the fuelpump parts
__________________
motion30 is offline   Reply With Quote
Old 13-07-2011, 11:16   #14
Registered User

Join Date: Mar 2008
Posts: 2
Thumbs up OMG !! same problem !~Re: At My Wits End with my 2001 Mercury 5HP 2 Stoke Outboard!

OMG !! I've had the same problem the last few years with my 5HP Merc ! (I think its a 2001 also!!)

I had it flood so bad I just used to remove the hose connection from the external tank every 30 seconds and then reconnect when it seems the fuel bowl was out of gas.....

It seems the float in the bowl wasn't doing its job. No problem starting the engine but after a few minutes it would stall and not start again unless I drained the carb fuel bowl.....and then the cycle would happen again. I have tried the same exact things as you (replace the float needle, etc) and checked all the jets, etc and couldn't fix the problem (never replaced the whole carb yet).

But then I found a solution. I drained and dried out ALL of the engine, the external and the internal tank BONE DRY. Then I went to to the closest gas station and got the freshest gas I could and tried it again. It worked fine and I did not have ANY problems the rest of the year just as long as the fuel was 100% fresh with NO TRACES OF WATER .

What I think has been happening the last few years is that all the gas has ethanol in it around hear and it just absorbs moisture (even though if you look at the gas it might look fine) So even if the gas is even a few months old it absorbs moisture and the float in the carb just does not do its job -- and I mean ANY MOISTURE in the gas (forget if its been sitting around all winter - even in a closed container).

Get ALL THE WATER OR MOISTURE OUT OF THE SYSTEM (even if you cant see it) -- Try what I said and tell me if it works for you. It did for me.

Tom
__________________
tsenator is offline   Reply With Quote
Old 14-03-2015, 14:12   #15
Registered User

Join Date: Jul 2008
Posts: 4
Re: At my wits end with my 2001 Mercury 5HP 2 stoke outboard!

Quote:
Originally Posted by Janae View Post
No hole in the float. When the carb is apart, it sits level.
Hey Buddy, I feel your pain. I don`t know if you have solved the problem, but I just solved the exact same problem on mine after banging my head against the wall for weeks. I took a 1000 grit piece if wet and dry and took the smallest amount off the sides of float pin. The problem is, that when you test the float by hand all seems good right? Then you put the whole thing back together and set off and all is well right? Then comes the flooding again arrgh! The problem is that the test you make by hand of the float exerts much more force on the float than the petrol rising actually does, so in a way, the test is invalid. The tiniest bit of friction on the pin will stop it closing properly. Ever so slightly smoothing the pin with 1000 grit (and then rinsing with petrol) now has my Mariner purring again with no flooding. Good luck with yours!
__________________

__________________
Marutji is offline   Reply With Quote
Reply

Tags
mercury, outboard

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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 -7. The time now is 18:47.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.