8/8/2018 7:08 PM
I had a Lastec 3600 that had a similar problem, chased problem for a while and was pulling my hair out. I followed all circuits and came to the conclusion that when you turned key to the start position, engine would crank over but fuel solenoid would not pull in. I checked everything and could not figure it out because somebody that owned machine before us had spliced wires and bypassed circuits. We replaced fuel solenoid and still did it. When key in on position and you push pin in on solenoid, it would hold, but turning key to start position it would not pull. Since mower was a backup and just used to mulch leaves, I installed a push button switch on control panel that received power from hot lead on key switch to push button switch, then went to wire that fed the pull on the solenoid. Machine now works. To start machine, turn key to on position, push button and you can hear solenoid click, turn key to start and machine fires up. To turn off just turn key to off and machine shuts off. I baffled many people trying to figure out problem, but this was only solution to get us back up and running.
Good Luck