M12….stumped!!

[AHS 1,550]

Brand new to me! I just replaced the fuel pump (and its pumping fuel, cleaned the carb), started for 10 minutes then i shut it off…..wait two weeks…. It wont start again, and its pumping fuel from the pump and. It’s filling up the carb bowl, but not getting to the spark plug. I cleaned the carb again, and it’s spotless! What should i do? Replace the head gasket? Replace the carb? BTW.. The story ive heard of the tractor was a very easy life, it was bangor savings banks long ago: it mowed. Their grass and snowblowed their  sidewalks… even though it got 0000 on the meter, i have a feeling it’s got less than 300 hours. Then the tractor sat in a field for the rest of the years… and faded!!

[squonk 43,939]

Is the choke closing all the way? 

 

Sat in a field. Mice get in the shroud and chew on the coil wire reducing spark?

[nylyon-(Admin) 8,000]

Will it fire if you shoot a little brake clean in the carb?

[clueless 3,263]

There is cleaning the carb, then there is CLEANING the carb, what did you actually do?

[wallfish 18,241]

If it fires with a squirt, it's fuel related.

If not, it's spark/ignition related

[AHS 1,550]

7 hours ago, wallfish said:

If it fires with a squirt, it's fuel related.

If not, it's spark/ignition related

Ok, it fires with fuel. So, carb? 

[AHS 1,550]

7 hours ago, clueless said:

There is cleaning the carb, then there is CLEANING the carb, what did you actually do?

Cleaned the carb good w/ carb cleaner. Took out the jets and sprayed thru the passage. I hate to buy a carb off ebay, (isavetractors tractors is all out of them!)

[AHS 1,550]

8 hours ago, nylyon said:

Will it fire if you shoot a little brake clean in the carb?

I haven’t tried thru the carb, but in the head it will. I’ll check that this morning. 

[Pullstart 67,042]

Valve adjustment?

[nylyon-(Admin) 8,000]

If it’s running with the brake clean, then you have a fuel issue.  Since you said that the fuel pump is pumping to the carb AND that the bowl is filling, then I would assume there is a blockage inside of the carb.  When you cleaned it, did you run small wire through the passage ways and blow out with compressed air?

[peter lena 9,309]

 @AHS    regularly  refer to running in an unknown engine engine , on a seperate callon of heavily treated fresh gas , that eliminates the possible  fuel hose break down , also add a fuel check valve , just under carb area , so you can see standing fuel held to carb , with clear line , done a number of  fuel related issues , usually  debris  loaded tank , ethanol  destroying any and all  rubber hose , if you don't remove  / change the fuel hose , the problem remains . my own experience with fuel issues ,is to eliminate all old hose / replace with new ,clean tank  add a couple ounces of  STA BIL to a full tank , and stop the hose break down , also have a filter close to tank ,and another close to carb , so you can see what's going on . have this change over , set up  on all my small engines , same result , instant starts , and no debris in filters . at each tank top off , add an ounce or 2 of stabil , make a complete change  to existing set up , pete

[953 nut 60,348]

5 hours ago, AHS said:

Took out the jets and sprayed thru the passage

Did you soak the High Speed Needle and make sure its passages are clean? It is actually a tube with holes at the top, middle, and bottom which determines the amount of fuel by comparing the atmospheric pressure to the pressure in the venturi. If it ain't right the fuel flow won't be either.

@ebinmaine did a great job of documenting a proper carburetor rebuild.

 

[ebinmaine 72,986]

13 minutes ago, 953 nut said:

it ain't right

 

 

I've been called this

[AHS 1,550]

6 hours ago, Pullstart said:

Valve adjustment?

Im hoping not to have to make it to valve ajustment!

[lynnmor 7,858]

19 minutes ago, AHS said:

Im hoping not to have to make it to valve ajustment!

While I doubt that valve adjustment is the problem, it is a good idea to know that the valve clearance is correct so you don't burn a valve or have excessive wear.

[clueless 3,263]

2 hours ago, 953 nut said:

Did you soak the High Speed Needle and make sure its passages are clean? It is actually a tube with holes at the top, middle, and bottom which determines the amount of fuel by comparing the atmospheric pressure to the pressure in the venturi. If it ain't right the fuel flow won't be either.

@ebinmaine did a great job of documenting a proper carburetor rebuild.

 

[AHS 1,550]

So, my fuel pump isn’t working… i am done with fuel pumps! I have facet 60304 1-3psi on my 418.  How about a facet 60304 on a 312?

[Racinbob 11,989]

24 minutes ago, AHS said:

So, my fuel pump isn’t working… i am done with fuel pumps! I have facet 60304 1-3psi on my 418.  How about a facet 60304 on a 312?

 

Good choice. There are many good ones out there. For my serious machines I've been using Mr. Gasket 42s pumps. The other have the cheapies but danged if they've haven't been working fine. They just go thump, thump, thump. The better ones have a nice whirr. Can't hear either with the engine running. 

[AHS 1,550]

Or an electric one from isavetractors? I don’t know how many psi they run….

[ebinmaine 72,986]

9 minutes ago, AHS said:

Or an electric one from isavetractors? I don’t know how many psi they run….

 

I have very little trust in his products.  

IMHO you're just as well off with a "jungle"  piece.  

The Facet brand from Aircraft spruce is the best bet and best price.