My experience with injectors is elementary but when installing new monarch nozzles all the injectors streamed if I pumped the pressure slowly even with the pop pressure exactly according to FSM specifications.

If I'm remembering correctly folks here who had a lot of experience with injectors told me to apply pressure pretty quick. I assumed the IP didn't put pressure on the fuel until it was time for the injectors to pop.

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84 300SD
85 380SE
83 528e
95 318ic