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Mike Peters · 07-11-2020, 12:16 PM

So your B carbs don't like hot weather? I installed a B carb on a Model A last year and like it. Like yours, it starts and performs well at all speeds. We took the car shopping a week ago when it was pretty hot outside. It ran fine, but one time at a gas station, it was a bit hard to start. I had to crank on it for several seconds. I like to barely touch the starter button and it's running. The other two times I started the car, it did start instantly.
We had a severe vapor lock problem on hot days a few years back with a 35 Ford. I filled it up at the next gas stop with premium gas. Premium gas absolutely fixed the vapor lock on that car.

Just a wild suggestion, but you could fill your Model A with Premium gas the next time you gas up and see if that makes any difference in how your B carbs behave in hot weather.

07-11-2020, 12:16 PM	#2
Mike Peters Senior Member Join Date: Aug 2012 Location: South East Wisconsin Posts: 1,279	Re: Model B Carb Issues So your B carbs don't like hot weather? I installed a B carb on a Model A last year and like it. Like yours, it starts and performs well at all speeds. We took the car shopping a week ago when it was pretty hot outside. It ran fine, but one time at a gas station, it was a bit hard to start. I had to crank on it for several seconds. I like to barely touch the starter button and it's running. The other two times I started the car, it did start instantly. We had a severe vapor lock problem on hot days a few years back with a 35 Ford. I filled it up at the next gas stop with premium gas. Premium gas absolutely fixed the vapor lock on that car. Just a wild suggestion, but you could fill your Model A with Premium gas the next time you gas up and see if that makes any difference in how your B carbs behave in hot weather.