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The electrodes need to be checked as the spark could be tracking, could be faulty HT leads also. Appreciate you wanting to fix it yourself but it may be better to call someone in who has the parts on board to swap and prove faulty items rather than spending longer tracing out and testing...

On rereading the post I agree with outinthestix's reply above. What type/make of burner is it? You'll be better Googling this rather than the boiler for diagrams. Once you start adjusting the pump pressure you really need the combustion testing kit to set the burner up properly, as said...

Solenoid coil is attached to the oil pump stem, has a power lead going into it and a brass 4mm hex screw on top. Remove the screw and pull off solenoid coil and then test as described in above post. This part would be my most likely suspect. At this point I'd usually look to see if the burner...