I have a new holland 655E backhoe loader with an iveco engine that will not start in cold weather, about 40F and lower. The owners manual says its equipped with a thermostart. I am learning how this thermostart system works little by little. As I understand, it is basically a cig lighter that lights a small amount of diesel to warm the intake manifold. When I turn the key, the light in the cab comes on and I can hear the fuel pump slow when I activate the thermostart, but I see no improvement in starting. I took out the cig lighter thing and tested it on the bench with a battery, it glows red. When I removed the fuel line there was no fuel drip, when I turned the key there was no fuel coming from the line. I checked for fuel where the thermostart line attaches to the injection pump and there is no fuel there either with the thermostart light on in the cab. There is diesel residue on the cig lighter like it was working at one time. So my question is what triggers fuel to be sent to the thermostart?