Dumb Sectional Map Question

[MSPAviator]

Why is it that many airports have gas available on the field, but aren't indicated as such on the sectional map?

PEX and CHU are two examples...

 

[Sac Arrow]

The answer is on your sectional key - "Services - fuel available and field tended during normal working hours depicted by the use of ticks around the airport symbol". My guess is your examples are untended self serve stations.

 

[Doggtyred]

This sectional depiction (and what is in the AFD) is based on what the airport manager reports during their every once in a while report/survey that they mail in. If they dont report it, it doesn't get entered.

That plus what the poster above said.