what is missing in my carb???

[muttero]

WHat the hell is missing in my carb???

sube fotos

[rickf]

Nothing from what I can see of it but I only see the back half of the carb. What makes you think there is something missing. If I had a clue as to why you were thinking of something I would know what to look for but the fuel line, throttle linkage, choke cable and vacuum lines all appear to be there.

[Horst]

sorry Muttero but your post does not make any sense.

[muttguru]

A gasket between the carburettor and manifold?
And maybe the fuel return line from the carb back to the tank. Maybe you have an M151 or A1 carb? What model number does it say on the carb?
ken

[rickf]

He does have the fuel filter screwed directly into the carb body, no adapter fitting. I can see the gasket.

[muttero]

Dear Friends,

My mutt does not starts the engine very quickly. you have to push the start button for a while until the engine turns on. If you look to the carb (a Zenith 13660) you see a screew on the top, close to the fuel filter. We think that it does not starts easy, because the fuel line which puts the petrol on the carb become empty after some hours.... so we think there is something missing in the place where this screw is...

We have been looking for images, but nothing clear. thats why I am asking.

Sorry I am disturbing, I just want to have my mutt running correctly. It is difficult to me ask mechanical questions in english...

Many thanks

[svramselaar]

hi

Ken there is no return line
it is not necessary to have one it is to prevent vapor lock
below the plug it is possible tad there sits a filter

george

[rickf]

Are you pulling the choke out to start it? Pumping the gas pedal will do nothing because the accelerator pump is vacuum controlled so it will NOT pump any gas when it is not running. You have to use the choke when starting, sometimes even when warm. All engines are different so you have to get used to how each engine is.

But on the subject of the return line, it appears that the fitting above the gas line coming in is from an early carburetor. If the carb number is 13660 then this fitting will restrict the gas but if it runs good once started then this is not a problem. That fitting will completely block off the gas if it is the wrong one. And the return line is not needed.

[muttguru]

on the subject of the return line, it appears that the fitting above the gas line coming in is from an early carburetor. If the carb number is 13660 then this fitting will restrict the gas. That fitting will completely block off the gas if it is the wrong one.

Rick (and Muttero).....now you know why I asked which carb he had
Ken

[rickf]

Right, but if it runs good once it is started then that fitting is not a problem.

[muttguru]

Right, but if it runs good once it is started then that fitting is not a problem.

Hi Rick,
yes, I agree. But what is that I spied in the fuel line? "Holy Restriction, Batman....could this be a fiendish "fuel filter?"
ken

[rickf]

Only on a running issue, again, if it is running well after starting then there are no restrictions at all in the fuel system. Muttero, Is this problem only during starting? How does it run at highway speeds?

[Fil Bonica]

Mutero made one comment that was interesting.
He mentioned that the fuel line was empty:
Could it be that the fuel pump check valve is open and allowing fuel to leak back thus causing ha
Start?

Fil Bonica

[rickf]

It would have to both valves in the pump failing and even if they did the engine starts and runs for the first few seconds on the gas stored in the carburetor bowl, More than enough time for the pump to draw gas from the tank to the carb. If the valves in the fuel pump were bad it would not pull gas from the tank during normal running. That is why I am asking how it runs once it is started. It is just sounding like "How to start a M-151" to me at this point unless he comes up with a drivability issue to go along with it.

[Badgerord]

One thing I have noticed is that some Mutts start better when run on Premium grade gas.

But I agree with Rick, "How to start" class may be in order.