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[action4478]

If you use a guage ,,unhook one of the lines from the pump & attach the guage to the line note pressure ,,,

Then ..re attach the line to the head & do the same thing with the other head , note pressure

If need be , un hook lines to both heads ,attach the guage to one ,& cap the other ,,note pressure ,,this will dead head the pump itself & tell you if the IPR is stuck open (no pressure)

The other tests are mainly for injector o rings ,,may just need to verify IPR ,,if presure there , then move on to the heads ...