It's almost like an gas engine except you have much higher presures upwards 360psi. You will need a special insert. You may find one that will fit the glow plug if not then you will need the one for the injector. It not starting on either makes me think your having problems getting air into the chambers for cumbustion till you prime it whick in filling the void till it starts and can produce sufficnet air for it's self. Thats something to look at.
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