On my 1840 it was electrical. I just manually hold the pump it open when running, Turn off the key close the pump and it stops running. It opened to start but doesn’t stay open (electrical).
I have a 1840 with same problem. It turned out to be electrical. I just use a bungee to hold the fuel pump open. Runs fine. I assume as I start it, it opens and when I let go of the key no current to the solenoid and the machine shuts down.
It has always started. I left it in the woods where I was processing wood for about 3 weeks. When I got back to it. Battery was dead. I tried to jump it but nothing. It cranked really well. The weird thing is that when the key is in the stop position the warning buzzer doesn’t quit. I had to...