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an Oscope does not look at current, it measures voltage.
you would be looking at voltage TO the FP which is from the alternator. not sure how that would tell you the condition of the FP.
to check the FP:
measure the fuel pressure
measure the fuel volume out per the manual.
measure the current drawn by the FP. to do that remove the fuse to the FP or find some way to connect a MM in line to the FP. the MM has to be set to AMPS and make sure your MM will meaure at least 10amps.
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