The Stovebolt Site Forums The Shop Area The Electrical Bay Truck won't start when hot (1947 GMC)

I thought I had a vapor lock issue, which I may still have?
I installed a 6V electric fuel pump to prime and hopefully pump when hot to help start.
That seems to be working correctly and does pump gas to the carb when it is hot (it used to not fill the line till cool down).
But now, even with the fuel pump, the truck does not start when hot. I need to let it cool down, then it will start.
I'm wondering if it is something electrical?
I have a new coil with an internal resistor.
Can I install an external resistor?
when looking for these, I have not seen a 6 volt resistor - yet.
Do I need a 6 volt or are they interchangeable?

Thanks for any info or assistance!