Transfered vehicle to indy shop because repair quote was almost $1K less. Drained tank. Replaced fuel pump w/fuel filter unit, level sender, & spark plugs. Added chemical to remove water from fuel system. Added fresh gas & ran for several hours. Injectors survived, but we know they fail anyway. Seller owns that one store only so no $$ there.
Now store is for sale ,btw. Discussed w/ Shell. Not responsible once fuel leaves refinery. Got inspection reports fron State fuel lab for local wholesaler & seller. Seller inspected once a year . Wholesaler once a month. Wholesaler uses 3rd party to deliver fuel to seller. No way to trace source of contamination & no one takes responsibilty of course.
Lesson learned: use station that has high turnover & in a neighborhood that sells some quanity of Premium fuel. Don't use the closest station when a better station is an option & may take an extra five minutes to drive to.