While an EMT II, I rather enjoyed Med Terminology 1A and
1B. A&P soon followed (2nd in both my EMT classes and had a perfect 4.0 GPA when I had enough of higher
(read that "LIberal") education)...I spent 2 years of what some would refer to as a "life" working an MICU in a not so warm and fuzzy area of SoCal, with AN EMT III (Paramedic) who thought he was god. I put in my time and went home. I did this for 72 to96 hours per week between my job with Goodhew and time spent in the ER at county general and Riverside community.
Fast forward to December 2009. I had changed professions years earlier and had been an electrical trainer and lead technician (troubleshooting and repair) for companies such as Caterpillar (16 years), Mitsubishi and Raymond Corporation for 26 years. During all these years, I learned a lot. I trained apprentice mechanics to Master mechanic over the course of a 12 year program, and also released lots more from the profession altogether simply for lack of aptitude.
Now here's the point...the meat of the subject if you will. Through both my professional careers, I've never heard the term carburetus constipatus
; yet it is a condition which undoubtedly exists. In humans, it takes place generally in the small intestine, where a blockage or obstruction of any other type generally results in the (by now partially broken down...as in "well, that sure went to shit in a hurry) fuel being ejected violently from the fill port (the mouth, for those of you who are still reading).
In a naturally aspirated engine, thankfully the situation doesn't get that messy. (NOTE: While you may not need it, purchase a rebuild kit for the carb from the OEM, and make sure it includes a new needle valve and float. I have 1/2 dozen or so in my tool box that I've not needed, BUT...if you need it, there is no substitute.) As Ski explained; Remove and completely disassemble your carburetor. Yes...into the smallest
pieces and parts. If you don't think you can do this, well, in most cases you're wrong! If need be, break out the digital camera and take good, high resolution photos of each step in the disassembly process. Be prepared for maybe a check ball, or needle valve to unexpectedly fall out onto the work-bench during disassembly. If you're taking your time, and working carefully, it won't be hard to figure out where they came from. Now, most needle valve seats in these carburetors (more appropriately termed a "mixer," although no one does) are removable. Remove it.
Now that you have it scattered into the smallest components possible, thoroughly clean the large components, inside and out, until there is not the slightest hint of anything other than clean, bare metal present (remember...inside AND out). Next, thoroughly clean the smallest components (ALL of them) and place them to one side. Now here is the part, which if you don't
do it, may well result in completing this whole procedure over again. Thoroughly clean all of the air bleed ports and fuel passages with carb cleaner with an extension tube attached (the tube won't fit into some passages, but will make a tight seal against the surface around the passage or port) so as to force the cleaner through with more pressure. Then use an appropriately sized wire (sometimes a set of inexpensive wire gauges from Harbor Freight is the best tool for the job, other times, pick an appropriately sized strand from stranded automotive wire to use for the job. In either case, be very sure NOT to break off a piece of the wire in a port or passage.
Once the afformentioned tasks are accomplished, clean the entire carburetor again, inside and out, with carb cleaner (including ALL ports and passages, with the ext tube attached). Reassemble with new float, needle valve and gaskets (DON"T use sealer of any type on the gaskets. Rely on proper fastener torque to create and maintain a proper seal.), install on your engine and fire it up!
All this assumes you've already cleaned the tank, screens, fuel hardlines and hoses, and replaced any filters.
ETA: I hereby nominate Ski as the official keeper of the ARFCOM dictionary of proprietary terms and phrases!