if you are 'over fueling' [flooding the engine with too much LPG]' you may be able to at-least get a little fire going by disconnecting the hose from the LPG tank waiting a few minutes then trying.
can you define what you mean by "COP ignition",
the codes in this truck are accessed by the accelerator pedal. have you checked on the woodward fuels website? search 'MI-04 woodward fuels' and they have considerable information on this truck's emissions controls system.
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