I'm downgrading this from "reliable" to "mostly reliable":
I'm back from a longer more challenging trip and have mostly success to report, but one failure: After a multi hour drive in temperatures that hit 108F at one point, I filled up with gas at around 4000' elevation, and then drove another 60 miles (in 100F+ temperatures) and ended the drive with final quick uphill to 7500' over about 10 miles. When I stopped the van there was a strong smell of gas, and fumes were escaping from under the van, near the gas tank and my GM vapor canister. There were also gurgling noises, as if the gas in the tank were boiling. I opened the gas cap and there was some pressure release (but not as much as in prior years before this modification). In about a minute everything was OK again, and the rest of the trip was uneventful. There was no smell of gasoline in the engine compartment, nor around the gas cap.
I could not tell whether I had a loose connection to the vapor canister or the gas fumes were venting from some other location.
As I understand it, the entire fuel system is supposed to remain sealed normally. But I assume there must be a pressure release mechanism in case of overpressure, right? If there is an overpressure vent, where is it located? Is it possible that even in a perfectly functional eurovan, extremes of temperature + altitude could overwhelm the vapor canister and cause venting?
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On Jul 3, 2022, at 2:11 PM, Michael Diehr <md03@...> wrote:
I'm back from another trip, and happy to report the canister replacement is working great. I've driven about 750 miles with it, and done two stress tests: where I drove from sea level to 5000' elevation in 95F temps, and another where I drove to 5000' in about 100F temps, filled up with gas, and immediately drove up to 7500'.
In the past, these situations would have resulted in tons of gasoline fumes, but with the 215-464 canister, it behaved normally.
I'm going to call this a "reliable" fix so far.
