Got the new cannister in the mail the other day. Took about an hour to replace. Real easy job. I didn’t try any of the testing of the valves and all, I just went for it based on other’s experience on the forum. I’ll find out this summer whether that fixed the problem. I feel like the old one is heavier, but that may just be me thinking it’s full of gas. 4 tubes, one plug and three rust free bolts and you’re done!
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This high altitude high heat truck shutting off issue is a known problem with these trucks, if you're just on vacation you need to live with it for the trip.
It is a EVAP issue.
I only used premium, but mainly because it became a dog at elevation
My anecdote is don't use high-test at elevation. Much less retarded ignition is needed. Only "85" research octane is used at elevation already for low-test regular. Less oxygen partial pressure means possibly/marginally incomplete burn.
I'm seeing a slight indication of this whole thing with premium fuel and elevation, thus my question.