Has any of you put an electric Solenoid onto a Needle Valve to make it a postive open, and positive shut operation?

That would eliminate the Float bowl and a host of other fuel flow problems.
First pull starts after sitting a whole season unused.

 

It's better to leave the opening and closing of the needle valve to the float. A level of fuel has to be maintained in the float bowl or the fuel air mixture is off. Also the different load demands on the engine will draw fuel at different rates out of the bowl.

 

And what's suppose to since the level of fuel in the bowl to regulate the flow?

The float does not just open and close completely, it does just what it says, it floats to maintain a constant flow as needed.

 

Here's a crude drawing of my idea. The Logic would pull the needle open at the start of the intake cycle. Short pulse for Idle, longer for faster speeds. Normally asperated operation.
The spring would always shut the needle when the ign is shut off.

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Well, you have a good idea, but it has already been invented. That's called a fuel injector. You would need an electronic processor/controller to give different pulse widths, holding it open longer or shorter, you would need a throttle body to control the airflow, a throttle position sensor to tell the controller how much gas to give it, a MAP sensor to tell the controller how much of a load the engine is under, a battery, and alternator. EPA would get involved and probably require an O2 sensor and some other junk.

A plastic float and a needle is just simpler and cheaper. The real problem is the stupid ethanol in the gas. It produces more pollution to make it than it saves when you burn it, it produces less work per gallon, meaning you use more of it to accomplish the same task which also negates any reduction in pollution, and it can't be sustained. It is also causing more parts and equipment to go to the landfill, making more pollution, and more pollution for the factories to make these replacement pieces of equipment and parts. Ethanol in our gas is causing much more pollution than regular gas ever did, but they pitch it to us as fuel for a "Cleaner Environment". Yeah right, more like subsidies and money in someone's pocket.

 

You have a good drawing and shows you're thinking. With the end designed to fan the fuel, It has a lot of the design characteristics of a fuel injector. To bring it closer to that little device you would drop the power down coil since the spring would bring it down to close and the power up coil would do the opening for you. Then pressurize the fuel feed to get the outflow of fuel consistent. You wouldn't really need to time it to intake stroke, but rather use single port type feed, which is what a carburetor is.

To bring it into the automotive world you would need all the engine management stuff Cheese described.

To handle the needle valve function you're pretty much working on the front end of the carburetor and to handle the fuel metering system you're on the other end past the main jet. Fuel injection doesn't key on those two ends specifically, but in it's design it covers all that and the points between.

That's a good job on the idea.