75Sv1, with the Roosamaster pumps on my Fords, we commonly fill the filter with ATF and start the engine long enough that it gets to the injectors, then let it sit overnight or so. That will often unstick a sticky pump. Does that sound like a good idea for these Bosch pumps? It is a Bosch pump, right?

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'75 John Deere 450C (times 2)
'83 240D plus parts car
'87 F350, 6.9L IDI
'89 F350 crewcab, 7.3L IDI
'89 F-Superduty, 7.3L IDI
'91 F-250, 7.3L IDI
'91 F-350, 7.3L IDI
'94 F-350 Crewcab, 7.3L IDI
'94 E-350 Ambulance, 7.3L IDI