Got a B&S pump working yesterday. It runs, but the low speed (air) needle has to be screwed in all the way to idle.
The fuel tank hose couple was suspicious of sucking air, but I ran it 20 minutes, fast idle, with the tank 30″ below
the pump, with no issues. Squirted WD-40 around the carb and reed flanges, and crankcase halves, while it was
running, and noticed no change in RPMS, hence the crankcase seems tight. Took the carb back off, and changed
out the tiny washer that the suction jet seats on, and changed out the welch plug in the top of the carb, in case it
was leaking, as it looked a little “rough”. The jet suction tube has a tiny hole in it, but It wasn’t plugged.
Hope to put the carb back on tomorrow and see if it helped, as I’m out of ideas!
VIDEO
https://youtu.be/W1KVU4rhskA
The suction jet had a “gooey” rubber gasket under it. Not sure if that could have
been a problem, but I changed it out for a hard fiber washer.
MD98A Tillotson……
Fuel pump seem to work with no issues……
Neither hole was plugged under the Welch plug, but
the plug itself looked a little “iffy.
Prepare to be boarded!