Unfixable random cutting out

[Chris Van]

Hi Boffins

I have a problem that is unfixable but thought as a last resort to post the symptoms here and see if anyone in the World can figure out what is going on although I have basically given up.

My 31 Town Sedan (still 6 volts) cuts out randomly. It starts with a warning misfire... then shortly thereafter cuts out completely as though you have turned off the ignition switch. Then you let it stand/cool down for 5 minutes then it starts again like nothing ever happened and pulls like a train. I have been driving the car daily for 15 years with never a glitch. And now this.

I have tried the following, to no avail.

1. Replaced the coil with a proven working used coil.
2. Replaced the condenser (three times with three working ones, just in case)
3. Drained the tank and refilled with fresh petrol.
4. Washed out the fuel tap, but the gauze filter was still clean as a whistle.
5. Tried driving with no fuel cap in case it was causing an air lock.
6. Replaced the points with brand new ones and set them properly and check there are no loose wires etc.
7. Bridged the ignition switch.
8. Replaced the rotor.
9. Replaced the top of the distributor cap.
10. Cleaned out the carburetor (multiple times).
11. Installed a glass bowl fuel filter as a water trap. No water in the fuel.
13. Checked that all the jets are clean and tight.
14. Checked that the ammeter wires are tight.

If anyone can shed any light on this mystery I would be very grateful as it is driving me crazy. It is very dangerous to have a car that cuts out at random but it is my daily driver so I don't have a choice. And nobody can fix it.

Thanks guys.

Chris Van
Johannesburg, South Africa