Hard cold start- lack of fuel- UPDATED

OK- so last week, I drove the car on several 90+ degree days and the next morning, it was always very hard to start. That list of new things I put on the car, some were an (unsuccessful) attempt to solve this problem.

I added a pint of Seafoam to the gas tank the last time I did a fill-up (Tuesday evening), then drove the car Wednesday and Thursday (both 90+ degree days). Thursday and Friday morning, the car started up immediately both times. Too soon to declare victory, but...

Seafoam is a gas additive I've used successfully for many years to correct running problems in small engines, such as lawn mowers and outboards. So, the outboard experience may have come in handy here!

Meantime, I'll buy a carb rebuilding kit, to have one on hand.