Yeah, I watched mine not work in situ. Removing the air intake hose gives a person a direct view of the thermostart device. I watched all 3 heat up red hot. I watched 2 of them work for a few seconds, as far as letting diesel fuel flow and flame up. But the two that actually let the fuel flow only did so a couple times. Even trying to get the fuel to flow by blowing into a tube full of diesel connected to the thermostart only worked once and even then only for a second or two. I have come up with a solution. I bought a solenoid valve that is controlled by the wire that went to the original thermostart. I am now going to experiment using a punch and hammer to displace the little ball that is part of the valve in the new thermostart. The objective is to get the damn thing to flow some diesel. But only the correct amount. The solenoid valve will prevent dripping when the thermostart is not being used. So my tractor will work the way it did originally. I know, it's a lot of hassle. But after 3 thermostarts not working even though they all get plenty hot I'm sick of the situation so I'm doing something I know will work.
Eric