fuel problem or electrical

Farmall Super A, AV, 100, 130, & 140 1939 - 1973

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.
User avatar
cjpenny89
10+ Years
10+ Years
Posts: 1073
Joined: Mon Feb 03, 2003 1:15 pm
Location: St. Charles, MI 48655

fuel problem or electrical

Postby cjpenny89 » Tue Jun 02, 2009 8:49 am

On my farmall 100 it tends to surge under load. When I surge I mean it will run fine for 30 seconds then kind of dies out then full power runns good repeat. Just driving around the property it is fine but put a disk behind or going up hill in the woods pulling a trailer full of fire wood it losses stride and sometimes up the hill wont pick up and quits and let me tell you full trailer up a hill and it stalls can be scary. I thought I had it fixed after I put new plugs in it but after a while started doing it again or more often. I am not sure if it is fuel starvation or an intermediate electrical problem does anyone have any suggestions?
Chad
"don't find fault, find a remedy"
1948 Cub, 1945 A, 1955 100

User avatar
Bigdog
Cub Pro
Cub Pro
Posts: 24066
Joined: Sun Feb 02, 2003 12:50 pm
Zip Code: 43113
Circle of Safety: Y
Location: OH, Circleville

Re: fuel problem or electrical

Postby Bigdog » Tue Jun 02, 2009 8:58 am

fuel
Bigdog
If you can't fix it with a hammer, you've got an electrical problem.

My wife says I don't listen to her. - - - - - - - - Or something like that!

Image

http://www.cubtug.com

User avatar
cjpenny89
10+ Years
10+ Years
Posts: 1073
Joined: Mon Feb 03, 2003 1:15 pm
Location: St. Charles, MI 48655

Re: fuel problem or electrical

Postby cjpenny89 » Tue Jun 02, 2009 9:51 am

Do you think its at the Carb?
I guess I will check the sediment bulb and make sure it is getting good gas there and the screen isn't plugged if that is good then should I pull the carb plug and see if it is getting good gas there? I am sure I did that and it seemed to be a good steady stream.
am I on the right track and if those are good what should I check then?
"don't find fault, find a remedy"
1948 Cub, 1945 A, 1955 100

User avatar
Bigdog
Cub Pro
Cub Pro
Posts: 24066
Joined: Sun Feb 02, 2003 12:50 pm
Zip Code: 43113
Circle of Safety: Y
Location: OH, Circleville

Re: fuel problem or electrical

Postby Bigdog » Tue Jun 02, 2009 11:43 am

Start at the tank and work your way down. Could be dirt in the tank covering the outlet.
Bigdog
If you can't fix it with a hammer, you've got an electrical problem.

My wife says I don't listen to her. - - - - - - - - Or something like that!

Image

http://www.cubtug.com

Jim Becker
Team Cub
Team Cub
Posts: 12140
Joined: Sun Feb 02, 2003 2:59 pm
Zip Code: 55319
Circle of Safety: Y
Location: MN

Re: fuel problem or electrical

Postby Jim Becker » Tue Jun 02, 2009 12:19 pm

Sounds to me like you are describing a governor surging problem. Go through linkage checks etc, same as has been described for a surging Cub. The bumper spring is in the bottom of the governor, under the acorn nut.

Daniel H.
10+ Years
10+ Years
Posts: 585
Joined: Mon Feb 03, 2003 1:18 pm
Zip Code: 27055
Tractors Owned: 1951 Super A
1955 Cub Lo-boy
Circle of Safety: Y
Location: NC, Yadkinville

Re: fuel problem or electrical

Postby Daniel H. » Sat Jun 06, 2009 8:51 pm

A common problem on these is the screen in the inlet on the carb. It will fill with rust from the tank and cause fuel starvation under load. The screen is soldered to the elbow where the fuel line enter the carb. You will have to back the elbow out to get at it.

Daniel
The four most expensive words in tractor restoration: "We might as well..."

User avatar
Bus Driver
Team Cub Mentor
Team Cub Mentor
Posts: 2899
Joined: Sat Feb 11, 2006 5:26 pm
Location: NC

Re: fuel problem or electrical

Postby Bus Driver » Sun Jun 07, 2009 5:45 am

A partially-clogged high speed jet will cause such symptoms. As the engine speeds up beyond the ability of the jet to supply enough fuel, the fuel mix becomes too lean and the plugs will not fire it in the cylinder. Thus the engine stops firing just as if the ignition had been shut off. As the engine slows, at some point the air-fuel mixture again becomes suitable for spark ignition. Since the throttle butterfly is open, the engine accelerates quickly until the fuel mix again becomes too lean.
As already pointed out by others, these symptoms may have multiple causes.
Luck favors those who are prepared

User avatar
cjpenny89
10+ Years
10+ Years
Posts: 1073
Joined: Mon Feb 03, 2003 1:15 pm
Location: St. Charles, MI 48655

Re: fuel problem or electrical

Postby cjpenny89 » Mon Jun 29, 2009 10:34 pm

I will try out the main jet and the screnn inlet on the carb. Thanks
Chad
"don't find fault, find a remedy"
1948 Cub, 1945 A, 1955 100

Phillip W. Lenke
10+ Years
10+ Years
Posts: 1479
Joined: Wed May 25, 2005 1:21 pm
Zip Code: 43449

Re: fuel problem or electrical

Postby Phillip W. Lenke » Tue Jun 30, 2009 3:03 pm

What kind of fuel line do you have
I had the same problem with our BN line was sagging lower than the carb, sounds like a good cleaning is in order. had a rubber line changed to steel.
Ours also had an in line fuel filter which I removed . Problem solved.
Phil
"Work Hard ,Play Often,Care Always"

User avatar
cjpenny89
10+ Years
10+ Years
Posts: 1073
Joined: Mon Feb 03, 2003 1:15 pm
Location: St. Charles, MI 48655

Re: fuel problem or electrical

Postby cjpenny89 » Tue Jun 30, 2009 8:35 pm

well I took the sediment bulb off and there was no screen so that wasn't it. Then I took the line off the carb and turned gas on and it gets a ton of gas. I pulled the carb screen out and it seem cleaned but I blew backwards on it and it seemed liked something woshed out. I get lots of gas with the screen hooked up. I ran the tractor with the fast hitch 5' disk. It seemed to be lots better but I had a few times it acted up but not like before. Maybe I need to pull the carb and soak the jets.
THanks for the help.
Chad
"don't find fault, find a remedy"
1948 Cub, 1945 A, 1955 100


Return to “Farmall A, Super A, AV, 100, 130 & 140”

Who is online

Users browsing this forum: No registered users and 0 guests