I have a Homelite "Yard Broom" blower with Walbro WT-471 carburetor I'm trying to get running. It belonged to my father-in-law and was apparently stored some 3-5 years ago with fuel in the tank . The priming bulb and fuel lines were all cracked and broken. I cleaned the tank with carb cleaner to remove the gunk, blew some cleaner thru the throat of the carb, installed new fuel lines, filter and priming bulb. However, when pressing the priming bulb it failed to spring back like it should so I reasoned there must be some blocked internal orffices. Disassembled the carb and blew out all orffices with carb cleaner. The priming bulb then worked normally but wouldn't pull in any fuel. The old diaphragm was pretty stiff so I disassembled the carb again and installed a new diaphragm, metering valve, flapper valve and gasket from a K10-WAT repair kit. Still cannot get it to prime.
When I press the priming bulb it forces air out the return line to the fuel tank - then when I release the bulb there is a chirping/whistling noise inside the carb as the bulb returns to it's normal position. There is never any suction on the line to the fuel filter. Any help/suggestions would be appreciated. I should note that I did not remove and clean the idle and speed adjustment screws as I wasn't sure how to reset these afterward. Neither did I remove the internal welch plug or filter screen since the old screen cleaned up okay and I didn't have the recommended tools to replace these parts.
Also was wondering if the priming bulb should work with the carb off the engine and the intake tube submersed in fuel or must the carb be mounted on the engine?
I'm about to run out of ideas and would appreciate any help or suggestions!