Engine almost stalling then recovering - SailNet Community
 
LinkBack Thread Tools
post #1 of 7 Old 07-24-2013 Thread Starter
Member
 
Join Date: Nov 2010
Location: bristol ct
Posts: 59
Thanks: 2
Thanked 0 Times in 0 Posts
Rep Power: 5
 
Engine almost stalling then recovering

Thought I had cured this problem over the winter,
In the fall, leaving the mooring, the engine would drop rpms
To the point of almost stalling then recover , then repeat ..
It was pulled for the storm before I could do much, but over the winter
I pulled the carb( clean inside, really clean, but I rebuilt it anyway
.) new cap rotor plugs , wires . No water in fuel, changed the fuel filter,
P.o. Installed indigo ignition so no points, installed new coil . When the boat went in I was in a slip for a few weeks , ran it against the łines and it was fine,
Ran it out in fishers island sound a few times probably an hour a time and it aas fine, today leaving the mooring same problem if almost stalling !
Any ideas!? I'm fresh out other than possibly the indigo box is dying..
And the fuel pump moves plenty of fuel( checked it in the fall)..
I'm at wits end ,!crowded mooring with good current , not a good place for problems ... My best solution so far is dumping the boat for something newer!

1972 c&c 30
Noank ct
dinosdad is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 7 Old 07-25-2013
Tartan 27' owner
 
CalebD's Avatar
 
Join Date: Jan 2008
Location: NYC
Posts: 4,755
Thanks: 4
Thanked 107 Times in 99 Posts
Rep Power: 8
 
Re: Engine almost stalling then recovering

Remember the old Texaco commercial: "Do you know what is in your tank?"

Probably not but I have owned a now 45 year old Atomic 4 for over 10 years. Ran into a similar problem that you are experiencing: engine revs unpredictable to the point of stalling.

We had dirty fuel in our tank. We kept cleaning and draining the carburetor but the problem would eventually return. We nearly always found crud in the fuel drained out of the carb by the main passage bolt/plug.

That winter I pumped out our half empty 20 gallon tank and at the bottom of the tank I found what appears in the picture below. This is the result of E10 gasoline that sheds its ethanol which attracts water and breeds bacteria; crud. Your corn tax dollars at work.

Good idea to also replace your rubber fuel lines as they can corrode from the inside and if they are old, they may not be rated for E10 gasoline.

Here is the pic:
Attached Thumbnails
Dirtyfuel.jpg  

"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen

Everybody has one:

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Last edited by CalebD; 07-25-2013 at 12:44 AM.
CalebD is offline  
Quote Quick Reply Share with Facebook
post #3 of 7 Old 07-25-2013
Senior Member
 
Join Date: Feb 2011
Location: San Francisco Bay area
Posts: 2,618
Thanks: 5
Thanked 62 Times in 62 Posts
Rep Power: 5
 
Re: Engine almost stalling then recovering

My first thought when surging is encountered would be a vacuum leak somewhere. I'm not sure if the Atomic 4 has any vacuum lines or much of a breather system, but check. You could try listening around for leaks with a pipe, one end in your ear.

Other places for a vacuum leak would be inlet manifold gaskets, either manifold to block, or manifold to carb.

Bristol 31.1, San Francisco Bay
MarkSF is offline  
Quote Quick Reply Share with Facebook
post #4 of 7 Old 07-25-2013
Reward for lost Kraken!
 
hellosailor's Avatar
 
Join Date: Apr 2006
Posts: 11,491
Thanks: 5
Thanked 132 Times in 129 Posts
Rep Power: 11
   
Re: Engine almost stalling then recovering

Clogged fuel line vent?
hellosailor is offline  
Quote Quick Reply Share with Facebook
post #5 of 7 Old 07-25-2013 Thread Starter
Member
 
Join Date: Nov 2010
Location: bristol ct
Posts: 59
Thanks: 2
Thanked 0 Times in 0 Posts
Rep Power: 5
 
Re: Engine almost stalling then recovering

Thought about the vent line yesterday,
Ran it with the fuel fill cap off, no difference

1972 c&c 30
Noank ct
dinosdad is offline  
Quote Quick Reply Share with Facebook
post #6 of 7 Old 11-09-2013
Senior Member
 
Brewgyver's Avatar
 
Join Date: Dec 2011
Location: So Cal
Posts: 388
Thanks: 6
Thanked 13 Times in 13 Posts
Rep Power: 4
 
Re: Engine almost stalling then recovering

It could be the carb float angle. Often when rebuilding a simple carb such as this, the float bracket is inadvertently bent. This can lead to starving, because the fuel level in the bowl is too low. Here's a youtube vid showing it. The carb is from an outboard, but the function is the same.

s/v My Sweet Girl!
Catalina 30 (Mark I)
Atomic 4
Brewgyver is offline  
Quote Quick Reply Share with Facebook
post #7 of 7 Old 11-09-2013
Senior Member
 
Join Date: Jul 2006
Location: Corpus Christi, Tx
Posts: 1,350
Thanks: 36
Thanked 42 Times in 41 Posts
Rep Power: 10
 
Re: Engine almost stalling then recovering

Fuel, spark, air. Most responses think fuel, but you said the carb was clean. Do you have an inline fuel filter between pump and carb? If so, replace it. Can you put a fuel line bulb pump (like on an outboard) after the main fuel filter, before the pump? If you can, then can you keep it from stalling by pumping the bulb? This is now I discovered my fuel pump was weak and stalling intermittently. If it is not the carb, filter or pump you need to go tank diving, or pumping. Get a totally clean tank with fresh gas and then you can rule out fuel. Next spark.
Good luck,
John
ccriders is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
Recovering a stolen dinghy and engine in another country? TQA General Discussion (sailing related) 13 03-31-2012 06:00 PM
Stalling Universal 5424 Engine ryderstk Diesel 6 08-05-2011 05:54 PM
1999 Catalina 380 - Engine stalling in reverse ibossenger Gear & Maintenance 5 11-17-2007 03:24 PM
Outboard Stalling max-on Gear & Maintenance 8 07-24-2007 02:07 PM
Recovering from Bad Starts Dean Brenner Racing Articles 0 05-29-2002 08:00 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome