Fitted new (second hand) fuel pump to my red TF 115 (1.6 model)....was an interesting experience as the one in it was a white top so fleabay ordered another white top....It would appear the one in it wasn't the original as was the top was damaged, also the locating lug wasn't there and the power feed cables had been spliced onto it. Found out the metal retaining ring also wouldn't fit onto the "new" unit I had purchased due to the lug. After sawing (botching) off the lug it fitted ok and started up
Now I've had a quick scan of google but can't find any info on the pump units for the TF 115....I know the MGF's had a different unit, different connector and a red retaining ring so can only assume that:
a) the older unit was fitted to the 115's (as with door mirrors, etc.) and would explain the spliced new style power block
b) Someone has swapped the tanks over
If anyone has any info I'd be interested to know.....it may also be useful for others with a TF 115