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My M819 will start then stall, then start and idle high for a few seconds . I have been using the primer pump to build up pressure, after it stalls, then it starts right back up. I have not found any air leaks yet, but I need to inspect the in-tank pick up tube(they rust through above the fuel level).
I think the stall/odd idle/hard restart, is common of an IP in need of a rebuild.
I decided to try to fix this issue today.
First I replaced the 2 plastic fuel lines for the fuel primer pump. I used 1/4" DOT air line with inserts and new brass ferrules.
I then pulled the emergency fuel shut off valve apart. I think this was my problem all along. I cleaned it all up and replaced the shaft o-ring with 2 new o-rings to fill the space and compress them well). You must be very careful when you pull the valve apart as there are a few little clips that can fall out(after you figure out how to get them out). They "clock" the valve port.
Once this was done, I opened the petcock on the cold start system and used the hand primer pump to bleed the system. This took about 25 strokes. Then I closed the petcock and fired it up.
It now starts instantly and when I shut it of(ignition switch) it shuts off like it should(it used to run on some).
I let it sit a few times for about 5 mins or more, and each time it fired right up with no hesitation and no high idle(like it used to).
Just thought I'd update this post with my issue.