Definitely a venting issue. I parked on a slope at the front of the workshop with the filler neck corner highest and was able to get another 2 gallons in, with the gauge now showing full.
The first gallon went in no problem, but the second took ages as the neck of the fuel can would get submerged in fuel in the filler neck and airlock itself. It waited until the level dropped a bit, got a gulp of air and let some more fuel out, and carried on like that for several minutes.
Following that there was a prolonged gurgling from the tank as the level settled. Pressing the vent in the filler neck changed the gurgling but didn't stop it.
Need to investigate the venting system...
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