How much gas in the carb? - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Gas > Atomic 4
 Not a Member? 
  #1  
Old 12-16-2010
QuickMick's Avatar
Senior Member
 
Join Date: Oct 2009
Location: California
Posts: 1,381
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 6
QuickMick is on a distinguished road
How much gas in the carb?

after yanking a bunch of stuff apart and putting it together my engine wasnt getting fuel. i figured out that there was an electric fuel pump--now i dont think it was actually a pump, but rather an emergency shut off valve--that had shut off the fuel supply when its power was cut.

so, i just removed it.

i turned the engine over, she tried to fire to no avail. i stuck my finger down in the carb and it was slightly moist. how much fuel should be in there as she is turning over? by firing her off with that damn shut-off valve closed is there a particular procedure i need to follow to 're-wet' the system with gas? i think my problem may be that there is too much air in the line... if that is the case, how should i go about fixing it?

or, if im wayyyyy off base and place i should look? she was doing fine until i started meddeling around.... as usual....

thanks guys and gals
__________________
How inappropriate to call this planet Earth when it is quite clearly Ocean ~ Arthur C. Clarke

Quinn McColly
Macgregor Venture
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 12-16-2010
tommays's Avatar
Senior Member
 
Join Date: Sep 2008
Posts: 4,282
Thanks: 1
Thanked 29 Times in 29 Posts
Rep Power: 7
tommays will become famous soon enough
Do you still have the manual fuel pump ?

The A4 manual pump has a priming lever that can pump huge amounts of fuel and if so you can remover the carb bowl drain and flush it with fresh fuel

I found after doing soaking the carb and putting a rebuild kit in the carb and fuel pump my motor it started in seconds

There was a huge amount of dirt in the fuel pump and carb
__________________
1970 Cal 29 Sea Fever

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

1981 J24 Tangent 2930
Tommays
Northport NY


If a dirty bottom slows you down what do you think it does to your boat
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 12-16-2010
QuickMick's Avatar
Senior Member
 
Join Date: Oct 2009
Location: California
Posts: 1,381
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 6
QuickMick is on a distinguished road
yes... the chain went-elec auto shut off--->fuel filter--->pump (the one mounted on engine). now it goes the same way, minus the elec override

is the lever of which you speak on top of the pump? or is that the pump housing 'latch'?
__________________
How inappropriate to call this planet Earth when it is quite clearly Ocean ~ Arthur C. Clarke

Quinn McColly
Macgregor Venture
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 12-16-2010
tommays's Avatar
Senior Member
 
Join Date: Sep 2008
Posts: 4,282
Thanks: 1
Thanked 29 Times in 29 Posts
Rep Power: 7
tommays will become famous soon enough
Its a V-shaped wire lever on the pump were it bolts on the motor

You may have to bump over the motor to get the full effect if the camshaft is in the pumping position
__________________
1970 Cal 29 Sea Fever

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

1981 J24 Tangent 2930
Tommays
Northport NY


If a dirty bottom slows you down what do you think it does to your boat
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Quick reply to this message Share with Facebook
  #5  
Old 12-16-2010
QuickMick's Avatar
Senior Member
 
Join Date: Oct 2009
Location: California
Posts: 1,381
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 6
QuickMick is on a distinguished road
thanks... there will be some pumping action tonight!!
__________________
How inappropriate to call this planet Earth when it is quite clearly Ocean ~ Arthur C. Clarke

Quinn McColly
Macgregor Venture
Reply With Quote Quick reply to this message Share with Facebook
  #6  
Old 12-16-2010
RichH's Avatar
Senior Member
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 2,964
Thanks: 10
Thanked 89 Times in 81 Posts
Rep Power: 15
RichH will become famous soon enough
Mic - Do you have an electric fuel pump in the system? Yes or No?

If yes, there will most probably be a safety switch on the pump that is connected to an oil pressure sensor switch (usually 'under' the Oil pressure transducer). This switch will cut off the fuel pump any time the oil pressure is below a certain set point. The switch is there to shut off the fuel, if the engine stops (oil pressure drops). The most common location of this safety switch is on a tee with the OEM oil pressure transducer or pressure gage line/tube.
So, if you have such a 'safety switch' plus electric fuel pump and the engine is not turning over fast enough during the start phase to generate sufficient OIL PRESSURE to close the switch ... you wont get any fuel to the carb. For such low start conditions you need to either 'jump' the safety switch or install a momentary push button bypass switch around the safety switch to energize the pump to start the engine. This 'oil pressure safety switch' on electric fuel pump retrofit is very common on A4s with aftermarket electric fuel pumps (mandatory on gasoline fueled automobile engines).

Last edited by RichH; 12-16-2010 at 10:41 AM.
Reply With Quote Quick reply to this message Share with Facebook
  #7  
Old 12-16-2010
QuickMick's Avatar
Senior Member
 
Join Date: Oct 2009
Location: California
Posts: 1,381
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 6
QuickMick is on a distinguished road
so maybe i shouldnt have removed it from the system?

i was under the impression that the shunt(its not called a shunt but i cant remember the name for it. open/close switch--not a rely... grrrr) would close without power (ignition on) to prevent fuel dischage in the event of a failure in the line--didnt know it was related to oil pressure?
__________________
How inappropriate to call this planet Earth when it is quite clearly Ocean ~ Arthur C. Clarke

Quinn McColly
Macgregor Venture
Reply With Quote Quick reply to this message Share with Facebook
  #8  
Old 12-16-2010
RichH's Avatar
Senior Member
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 2,964
Thanks: 10
Thanked 89 Times in 81 Posts
Rep Power: 15
RichH will become famous soon enough
Its was either suppliec by Moyer Marine or Indigo Electronics .... get a copy of the correct wiring diagram and reinstall it. Will save a lot of start 'hassles'; also consider to mount a hard start bypass toggle switch around this safety switch ... . can be done with a 3 pole double throw switch ... then you can also prevent boat theft when the switch is left in the 'middle'/open position.
Reply With Quote Quick reply to this message Share with Facebook
  #9  
Old 12-28-2010
travlineasy's Avatar
Morgan 33 O.I. Perryville
 
Join Date: Dec 2010
Location: Maryland
Posts: 2,608
Thanks: 3
Thanked 81 Times in 68 Posts
Rep Power: 4
travlineasy will become famous soon enough
I suspect there are a few things that you'll need to do.

First and foremost, the Atomic 4 carbs are fairly easy to clean, adjust and rebuild. However, they are also quite prone to getting tiny specks of dirt in the fuel system as well. Remove the carburetor, unscrew the top and carefully remove the float mechanism. Next, using canned air, blow out all the ports and openings where a tiny bit of crud can become lodged. It only takes a sand sized speck of dirt to clog the carburetor.

Now, go to the nearest auto parts store and purchase a can of carburetor cleaner. It's a spray/solvent. Be sure to follow the directions and use this stuff outdoors and position yourself upwind of the cleaning spray--it's nasty stuff. This will clean any residue that may be on the jets, vents, etc...

The most critical step is to set the float level. You'll find instructions on this on the Moyer Marine web site. If the gasket(s) are cracked, you can make new ones from gasket material that's available at any auto parts store.

Next, the flame arrestor must be thoroughly cleaned. It takes a fair amount of work to get the flame arrestor spotless, but unless it is completely free of oil and dirt it has a dramatic effect on whether the engine will start or not. I cannot emphasize this step enough. And, DO NOT try to start the engine without first having the flame arrestor in place--this could be very dangerous.

After reassembling the carburetor and reinstalling it on the engine, lift the fuel pump priming lever a few times to fill the carburetor's fuel bowl. Set the throttle at about 1/4 to 1/3, make sure the transmission is in neutral, pull out the choke all the way and try to start the engine. When the engine begins to start, slowly open the choke and back off on the throttle so the engine does not over-rev. Allow the engine to run at high idle speed until the temperature gauge reaches at least 100 degrees.

There are other things that can cause the engine not to start. The Atomic 4 is an incredible engine, but it needs a few things to keep the internal parts in good working condition. Frequent oil changes are a must--at least for those that do not have an oil filter, which is many of the older models.

Another critical item is the addition of Marvel Mystery Oil, which should be added to the gas tank each time you add gasoline. ::Marvel Mystery Oil:: It is an outstanding product that keeps many, many Atomic 4 engines running smooth as a kitten. It's an excellent top cylinder lubricant that keeps the valves free of corrosion, lubricates the valve seats and protects the valve seals. If those valves are not properly lubed and sealed, the engine will not start.

Hope this helps,

Gary
Reply With Quote Quick reply to this message 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:

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

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cleaning/rebuilding a Honda 9.9 Carb SVlagniappe Gear & Maintenance 8 12-08-2010 08:37 PM
carb question for yamaha outboard Incantation Gear & Maintenance 1 11-01-2010 02:43 AM
zenith 68 carb, main passage bolt JarrettF Atomic 4 3 06-10-2007 03:57 PM
CRUSING THE CARB IN SUMMER jsgsail Cruising & Liveaboard Forum 4 05-24-2004 04:31 PM


All times are GMT -4. The time now is 12:06 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.