Can't tell you on the C3 Pic, but most PSA's as i recall you will find a rubber tube belows across the top of the engine or maybe clipped to the bulkhead (follow the pipe where it comes up from the tank), its an inline pipe pump which you grip and release not an old fashioned up down plunger sitting on the filter.
Course its possible they've done away with them, even my 90's Merc Diesel had no primer (self bleed supposed to just wind it on the starter for 5 minutes, yeah right), but it was easy to pre fill the filter bowl with clean when renewing and refitting bowl, as i recall the last PSA filter i changed was buried somewhat so not so easy to pre fill.
|