MERCURY Capri this side of the pond. I am going back in the memory banks....MS 3.1 eye think...weren't fuel fillers in C pillars on Brit versions? Or was that one of the Marks later than this?
I worked for Lincoln-Mercury at the time these were popular...and after I left there, did a lot.
The big issues were A) Dagenham transmission, B) ringing prop shaft, C) horrible front end design.
Prop shaft was fixed (really) with a full face shield, drill a hole in the back of the shaft, rotate 180 and drill a hole in the front...then use an early version of two-part spray expandable foam, insert the nozzle in the back, on a lift, have your assistant pull the lever...and when it bubbled out the top hole at the trans end, stop...when dry, trim it off.
They had a two-piece, three joint shaft on the very early ones..could never get them balanced..change them all over to single piece..and got the ringing.
The nasty issue was sun roofs.
When they were assembled, there is a shelf to catch water ingress, with a drain hose at each rear corner. Unfortunately, whoever had the responsibility on the line to feed the hose down and THROUGH the hold forward of the wheel housing....didn't. The were bent over, sealed off.
Pouring rain, 36 degrees, poor driver comes off the freeway, hits the brakes at the end of the offramp, and a gallon of very cold water came out of the catch basin, and right down his neck.
Oh, the screaming we heard.
Front end, while most cars of the era had lower control arm positioned by a radius arm headed rearwards, these depended on the forward mounted sway bar to hold the control arms in place. Rubber dongle pressed into the cast control arm, had to remove the inner pivot bolts to feed the arm onto the angled outwards front mounted sway bar, then use everything you could muster to try to get the last arm back in far enough to get the pivot bolt back in.
And do the sway bar bushings at the same time..because all 4 bits wore out together..rapidly.
I remember them well..."The sexy European". Right.