Nissan Repair: Engine quits, datsun roadster, volt ohm meter

Question
QUESTION: I have a '69 Datsun roadster. It runs fine for a few miles and then suddenly it barely runs and then quits. After being shut down for a few minutes, it runs fine again for a short time and then quits again. It appears to be heat sensitive. Any suggestions? Thanks.

ANSWER: Bill,

Check the fuel in the float bowl to see if it is boiling off or that the car is vapor locking.  This engine was always heat sensitive.  You can insulate the fuel line coming to the carb and that helps.  Also, check to see if the engine us running hotter than usual.  If you live in a hot climate it only makes it worse.

---------- FOLLOW-UP ----------

QUESTION: Thank you very much for your prompt response. I do not believe the problem is vapor lock or fuel boiling. We have owned the car for 38 years and lived in the same place for all that time and this is the first time we have had this problem. The car has twin SU carbs which are very simple devices and relatively trouble free as long as they are kept clean. As a computer technician I was thinking an electrical component might be the culprit. Maybe the condenser. What do you think about that? Thanks.

Answer
Bill,

Yes, you are spot on since you have been in the same place I would be looking at the coil and condenser.  Get a volt/ohm meter and check to see if there is 9 volts run and 12 volts during starting at the coil.  Then, on the other side you want to see if the plugs are getting spark.