Carb Float Adjustment

1941 - 1945, MB, GPW Technical questions and discussions, regarding anything related to the WWII jeep.

Moderator: Moderator

Carb Float Adjustment

Postby dhbyers » Mon Jul 23, 2012 8:42 am

Quick question on carb float adjustment, could some one post a closeup picture of what part you bend on the carb to achieve the correct float adjustment?

My MB is prone to flooding after running for a while?
dhbyers
G-Master Sergeant
G-Master Sergeant
 
Posts: 104
Joined: Thu Sep 24, 2009 5:23 pm

Re: Carb Float Adjustment

Postby Brandon » Mon Jul 23, 2012 9:31 am

I dont have a spare float sitting around but it's the center tang. You only adjust the float tang. The two side ones with the holes in them for the dowl pin is not them the one in the middle. If you have the correct needle pin spring and seat assy its the only thing that actually makes contact with the float. It should be easy even without a pic. Hope this helps. I just use a small needle nose pliers to make very small adjustments and reassemble and measure for the 3/8in distance from the bowl cover without gasket.. Im sure there is even a carter tool to bend it somewhere.

Brandon :D
HH-60G Helicopter DCC USAFR 2010-
UH-60L Helicopter CE U.S.A.2003-2009
Image
1942 Willys MB Slat Grill 114640
1952 Strick M-100 Trailer
http://www.g503.com/serial-numbers/view ... rd_id=3821
User avatar
Brandon
Sergeant Major of the Gee
Sergeant Major of the Gee
 
Posts: 435
Joined: Mon Dec 31, 2007 5:57 pm
Location: Arizona

Re: Carb Float Adjustment

Postby dhbyers » Tue Jul 24, 2012 5:06 am

Thank-you perfect answer, I thought was the case, have you heard of anyone tweaking the adjustment slightly either up or down. I smell gas and the MB is prone to flooding after running for awhile? TX again
dhbyers
G-Master Sergeant
G-Master Sergeant
 
Posts: 104
Joined: Thu Sep 24, 2009 5:23 pm

Re: Carb Float Adjustment

Postby echelon1 » Tue Jul 24, 2012 6:20 am

You might have a leaky floater needle or floater bulb.
Check the needle for damage, and the needle seat for tightness in the casting (there is a small gasket).
Shacke the bowl, there might be fuel inside due to a leak.
Also, if the fuel pump has a wrong pressure spring in there, the fuel pressure might be to high causing the needle to leak. (repro pumps have been found with to strong springs under the membrane.)

Gindi.
echelon1
G-Colonel
G-Colonel
 
Posts: 1471
Joined: Fri Jun 17, 2011 6:33 am

Re: Carb Float Adjustment

Postby Derek Eddlestone » Tue Jul 24, 2012 7:04 am

dhbyers wrote:Thank-you perfect answer, I thought was the case, have you heard of anyone tweaking the adjustment slightly either up or down. I smell gas and the MB is prone to flooding after running for awhile? TX again



The level in the Float Bowl is what determines how easily the fuel can be drawn up to the Nozzle Jet which is what you can just see poking in to the Venturi Tube in the centre of the carb. Setting the Float Height at 3/8" means that on even ground the level in the Bowl will be at the same level as the lower lip of the Venturi Jet. Too low a level and more vacuum is required in the Venturi Tube and too high a level means that the fuel will spill through the Nozzle Jet in an attempt to even out the levels. With the engine running this will never happen as the Fuel Pump is constantly topping up the Float Bowl and you will be wasting fuel as the engine runs rich. Following experiments carried out by another more scientifically minded jeep owner I have reduced the Float Bowl level by a tiny amount. The running of my jeep is totally unaffected by this change but I understand that the fuel economy will improve. Any link between Float Height and riding over uneven terrain won't affect me as I only run on roads.

The picture of the Float shows the centre tab that you bend to adjust the Float Height.

Image

These are the Carter Tools that you should use if you're working on your jeep carb. The tool that Brandon mentioned for bending the tab is shown second from the left. This tool kit is from 1938 but most kits up to the 1950s could have all of these tools in them. The only tool not shown is the 3/8" blade used to set the Float Height. I use a 3/8" drill now because the blade has to be at exactly 90 degrees to the face to be accurate whereas the drill is 3/8" whichever way you roll it.



Image


Sometimes the tool kits go for silly money but check these two out that I recently found on ebay and you don't have to pay a lot. One has been sold on and the other is on its way to me as a potential sale. Both kits contain every tool and gauge needed to work on the WO and more tools as well.

140788111083

130700335559

Derek.
Derek Eddlestone
G-Lieutenant General
G-Lieutenant General
 
Posts: 5310
Joined: Sat Apr 03, 2004 11:30 am
Location: New Forest. England.


Return to MB GPW Technical Knowledge Base

Who is online

Users browsing this forum: Beers, Google [Bot], JAB, oscard, ozm29c and 31 guests