HI sailing fan, my humble apologies I hadnt heard of an SB8 before & couldnt open your pictures before for some reason so I assumed you were talking about a YSB8. The principles apply the same but your layout is a bit different. No wonder I couldnt figure out the sump pan Hope I didnt cause you too much confusion Feel quite embarassed now. Should have read your posts more closely.
Wishing you a speedy recovery. Compass

Lookat this video & see if injection pump is the same but dont take it off unless you have to Sorry this site wont let me send email or link if you want a link to it look on youtube for Aussie50 & search for Yanmar yse12 injection pump. Somthing for you to look at whilst u r laid up. If you put washers on yr banjo bolts ( strongly recommend u do) you will have to bleed system . You can just anneal copper washers, thats what I do to avoid Yanmar mafia but as I say nylon best up to injection pump as its only 5 psi but after injection pump its approx 2400 psi. Hang in there u'll beat that engine in the end I think.