My breakdown on the M3 was related to my fuel pump too. Will someone in Highways please take a look at what’s wrong with this road?
Have you checked the fuel tank itself? Had exactly the same problem with the feeder pipe from the bottom of the tank kept getting clogged with pieces of old rubber from the fuel filler neck that had to be replaced, the suction would keep the rubber bits covering the hole and starve the engine. After stopping for a few minutes it would float and the engine would start again, then stop again down the road.
Seem to remember someone on here had replaced the sender which had a label On it which later floater off and blocked the outlet
If you do the fuel pressure check with the empty bottle sideways, you’ll at least eliminate fuel feed to the carb, but it does sound like this. Ozziedog,,,,,,,,,fuel pumps ggggrrrrrrr