Thanks for follow-up.

Been a frustrating year on this truck since I dropped a valve into the cylinder during timing belt service with valve seal change. Replacement water pump shaft seal failed and then new head gasket failed with coolant into cylinder #4. Eventually used "Steel Seal" which has fixed the coolant breach but now this no fuel from injector #4 seems more than a coincidence.

I wasn't sure if injectors fired with grounding or applied 12v, not much in the FSM. With ignition on I get about 9 volts at the harness. Having to remove plenum for injectors is a pain, but compared with my two previous tear downs the past few months not that bad. It's as if the truck has a death wish.

I hope I find something definitive when I pull the injectors. Hate testing and finding nothing.