M151A1 Zenith Carb Problem

Steel Soldiers is supported by:

Charlie 6

Member
145
7
18
Location
Claremore/Oklahoma OK
My M151A1 starts and runs great. Problem is when I am in 4th gear driving 40 mph I let up off the gas and push the clutch in to down shift to turn off the road and the engine quits. Same thing going down hill I take my foot off the gas pedal and it stalls. The electric fuel pump is new also has new plugs and just converted to electronic ignition. Any ideas?
 

Charlie 6

Member
145
7
18
Location
Claremore/Oklahoma OK
Thanks for the replies, It idles fine when sitting, I will bring the idle up a little more by pulling out the choke a little. I will take it for a test drive and see what happens.
Thanks any more suggestions please let me know.
 

poppop

Well-known member
2,322
36
48
Location
Brooklet, Ga
Everytime mine did that I had picked up a little trash in the idle jet. Took carb apart and blew out and corrected problem. They all need to run with the choke out a little.
 

Charlie 6

Member
145
7
18
Location
Claremore/Oklahoma OK
I am planning to put some Sea Foam in the tank, when I installed the new electric fuel pump the tank was clean inside so no worry there.
In the early 1980s I rebuilt a couple of M151A1 Carbs when I was in the army.
B Co 701st Maint Bn, 1st IDF Panzer Kaserne, Boeblingen, Germany.
 

Charlie 6

Member
145
7
18
Location
Claremore/Oklahoma OK
I drove a M151A1 and A2 in Germany from 1979 to 82, even on the autobahn, don't remember any carb problems.
I also was issued a new Mutt that came out of Prepositioned Materiel Configured to Unit
Sets (POMCUS) from England with only 15 miles on it, It drove/ handled/ sounded like an old jeep.








:lost:
 

vtdeucedriver

New member
2,525
6
0
Location
Vermont
Turn the idle up a bit and you will be fine with your current problem. The 151 always seems to have issues on how they run. I would not worry about setting the choke just yet, That usually fixes another problem
 

bullfrog1234

New member
110
1
0
Location
mississippi
I have an issue with mine, it will idle fine, but it spits and sputters when i press down on the fuel petal. Lately it back fires through the carb. I am in the process of cleaning the carb and checking for vaccum leaks with zero leaks that I can find. I even checked the timing and that has not fixed the problem. I have not drilled out the jets in my carb because it is brand new and I was hoping this would fix the problem.:cry:
 

Charlie 6

Member
145
7
18
Location
Claremore/Oklahoma OK
I was able to pick up a new carb at a fair price and slapped it on, I set the choke to what the 20 manual recommends and it runs perfect now. It also has better pick up and top speed. Thanks for all your support.
 

bullfrog1234

New member
110
1
0
Location
mississippi
it is easy. I dipped one of mine in the carb cleaner and it removed all the crude. The only thing left to do is check the jets. The seal and repair kits are cheap.
 

bazookajoe

New member
30
1
0
Location
central new york
once the carb is rebuilt properly you dont need to run with the choke out. I put a tank liner product in my gas tank to contend with particulate corrosion. The rebuild the carb... correctly, by making sure the top of the float chamber is flat and seals well and be sure to seal around the long brass jet
 

m38inmaine

Active member
2,094
8
38
Location
Maine USA
There is an ad in mvm from Brooks Engine Service in FL advertising M151 carburetors that have been rebuilt as to eliminate the usual problems.
 

Rainman

New member
25
0
1
Location
Cuyahoga Falls, Ohio
Zenith's are a bit finicky but I don't run with any choke, and you shouldn't have to. You have other gremlins to chase if your having to jack up your carb to compensate. Red River has NOS Zeniths for $150, soft and hard rebuild kits are cheap and readily available. I had some hiccups in the carb after the local Memorial Day Parade and the new carb fixed me right up. No backfires from either end.





Can never have too many fuel filters on military vehicles. Frontline might be one of the cheaper suppliers on rebuild kits if I remember right.
Rainman
 
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website like our supporting vendors. Their ads help keep Steel Soldiers going. Please consider disabling your ad blockers for the site. Thanks!

I've Disabled AdBlock
No Thanks