I think you knew what it was before separating the housing,you were on the right track forsure. I had an' inkling too. Good final diagnosis.Well, I’ve just torn my fuel pump housing apart to see why the housing was ‘hot’(live 12v) and guess what I found. . .
View attachment 1628379
Looks like when I last stripped it and replaced pump motor and fuel filter, I hadn’t taken enough care to be sure the wires were not pinched as I screwed it back together.
So lesson learned here, and @rubbersidedown , here’s the goods on the situation as you were keen to know why the TB’s were hot 12v.
Easy fix anyway, but it’s just so good to know why that fuel pump circuit fuse blew.
Mystery solved!
Rubb.