You have the reed vapor pressures backward, fall, winter and spring it is 9# here for pump gas. Summer here it is 7# to help keep gas fumes out of the atmosphere. Avgas generally has even less so it is even less prone to vapor lock..less.
I own a fuel company and have been selling Sunoco race fuels since the mid 80s and still do today, yes even today I sold some. I have met Sunoco's Mike T Miller and learned a lot from him over the years. He's the technical operation manager for Sunoco performance products.
Av gas check it out. Yeah.. summer fuel is low RVP winter in this area is
right at 10#... I tested the RVP on every load of fuel
I ordered.. and I even had a load with 15# RVP which
was a special order... plus I had to test it before every
test... its measured from 32*or less up to 100*..you use a
stainless seal vessel(we called them bombs) and its set in
the 100* water and that water temp is exact
[/quote]Ya, had my numbers reversed as I was basing them on the test procedure; " the higher the # the more susceptible it is to vapor lock". Sorry bout that. At any rate, there is a reason why the fuel we buy from the pump is reformulated at least 4 times a year based on average ambient air temp changes - and those changes are in the RVP area.
