Listed here is a USED Mercury Fuel Supply Module Cover Kit.  These are all Genuine OEM Mercury parts NOT cheap Chinese aftermarket replacements.  Fuel pump cover cap has some staining, scuffing, wear, etc. consistent with a part of its age.  I AM NOT GUARANTEEING OPERATION OF PARTS OTHER THAN COVER ITSELF.  The part number for the cover itself is 880596T50.  I am only listing it as that part since the Fuel Supply Module (aka FSM or VST formerly)  failed and I am not sure what part is was. Caused engine to sound alarm and run poorly (possibly was guardian/limp mode).  So if you are a gambling man maybe you can make some of it work or use the spare parts for something else.  There wasn't any water in fuel and wasn't badly stale.  Client opted to replace entire VST assembly and that fixed the issue so something is definitely off here but not sure what it is.  This is the cover that fits on the top of the vapor separating tank and holds the pumps, harness, float, etc.  Fits on FSM part # 880133T08 superseding to p # 8M0130897 (listing for almost $1,400 new from dealer) and possibly other part numbers since Mercury has changed these pumps many times over the years.  These were used on a wide variety of 4 stroke engine platforms throughout the 2000s starting around 2007 and up model years and was used on many four stroke configurations like Command Thrust, Sea Pro, Verado, and possible others as well.  This one came from a 2019ish (not sure exactly the year) 90 horsepower engine that spent its entire life on a freshwater Orlando chain of lakes and has never seen salt water.  Part numbers for the possible faulty parts included just in case  you want to price or replace them is the harness part # 84-880596526 which supersedes to 84-8M0130898, fuel pressure regulator p# 880596503, float p# 880596524 superseding to 8M6000359, high pressure fuel pump # 880596T55, lift pump # 880596T58, and seal 26-880596502.  The parts you see pictured are the actual parts you will receive with nothing extra.  FSM Cover Assy is stored in a climate controlled parts room to prevent deterioration.  PLEASE CONTACT ME WITH ANY QUESTIONS ABOUT CONDITION, COMPATIBLITY, ETC. before purchasing and I will help you to the best of my abilities.  Thank you for your interest.  Good luck.  Steve MMSLLC :)