Hey Guest!
Hey - did you know if you click on the title of a thread it will take you to the first unread post since you last visited that thread?
but were afraid to ask: 
STOP!! Never post your email address in open forums. Bots can "harvest" your email! If you must share your email use a Private Message or use the 
smilie in place of the real @
Pretty Please - add it to our Events forum(s) and add to the calendar! >> 
V
vagt6
Guest
Guest
Offline
This exact same phenom occurred to my '74 Midget. I had to have her towed once, after cutting out after a long-ish highway drive.
The cutting off problem was "vacuum lock" of the fuel pump: I had replaced the original, vented gas cap with a Moss replacement that was NOT vented. Thus, as gas slowly flowed from the tank it created a vacuum in the fuel system that caused the fuel pump to seize, cutting off fuel flow to the carbs.
After I figured this out (it's described in the SU manual), I drilled a very small hole in the gas cap and the problem was solved.
I hope your problem is as easily solved.
Good luck, let us know . . .
The cutting off problem was "vacuum lock" of the fuel pump: I had replaced the original, vented gas cap with a Moss replacement that was NOT vented. Thus, as gas slowly flowed from the tank it created a vacuum in the fuel system that caused the fuel pump to seize, cutting off fuel flow to the carbs.
After I figured this out (it's described in the SU manual), I drilled a very small hole in the gas cap and the problem was solved.
I hope your problem is as easily solved.
Good luck, let us know . . .