Enough fuel on board, doesn't mean fuel was supplying the engines. Take the Guernsey SAR aircraft, I know that was pilot error and I very much doubt the Glasgow one is! But in the SAR aircraft case:
Two engines
Well maintained aircraft
Experienced crew
At night
Low level
The Pilot new he had plenty of fuel on board, one engine stops shortly followed by the other one. It's nothing short of a miracle they found the only off Airfield landing space on the Island, walked away from it and lived to tell the tale!
Otherwise we may well be discussing on this forum, how a perfectly serviceable aircraft with plenty of fuel on board had both engines quit!
If Dave's supply tanks were wrongly reading full and he got no amber warnings (as in the case of the NWAA 135, although I see that post has been pulled from this thread) then imagine his surprise when he got a red warning in a very difficult situation.
Ok shoot away! I'm ready to duck!