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Carburetor Primer

On a diaphragm carburetor, what makes the diaphragm move down?

I have a Walbro carburetor that does not seem to be getting gas. If I choke it repeatedly it does not even sputter. No unburnt gas spits out. No primer bulb either. I believe the model is a Walbro WT. I looked on Walbro's website and nothing came up. I figure it is the diaphram or the reed valve under the diaphram needs adjusting on when to open. The diaphragm feels soft.
So in short my questions are:
What makes the diaphram move down? vacuum?
Would the reed valve needle cause mower to get no gas if it is always closed? I would imagine yes...
If you think the reed valve needle needs adjusting, what would be the proper height? I do not have the gauging unit that Walbro sells for this but I do have other tools that will work if I know proper height.

I think that your best bet is to get a rebuild kit. They cost about $15 at a small engine shop. Chances are that the diaphram is either leaking or streched out of shape and not working correctly. I have messed with a lot of these carbs and usually end up getting the kit and making it right. Vacuum moves the diaphram which pumps and meters the fuel.

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Lawnmower troubleshoot: won't start?

I have a Brigg's and Sratton 6HP Quantum engine. I replaced the spark plug. I pulled off the air filter and pushed the primer and looked through the air filter container and could see that there was a very small amount of gas coming through a little tube, so does that mean my carburetor is working? Any suggestions on where to go from here?
It is a self-propelled mower. Also, after replacing the spark plug, there is still no spark. I stuck at this point.
Is there anyway I could test the ignition module (Magnetron) with a multi-meter?

If you don't have spark it could be a couple of things. Could be the ignition module or it could be that the ground wire from the ignition module is grounding somewhere. I don't know how you are checking the spark but remember that you have to turn the engine fairly fast to create a spark. I use a harbor freight inline tester and it works great. Most small engine shops can test the ignition module if you take it off and take it to them.

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