Did you ever torch it ala Aussie F-111?
Unlike the Aussies (seen here), our NATOPS specifically prohibited use of burner with Dump selected so it did did not become a part of our stunts like it did down under.
However, there we were with a full bag of gas and on the flight schedule for FCLPs out of Oceana and faced with not enough time to burn it off even in burner. The jet wasn’t ready for our scheduled launch time so we were running out of time. We finally launched out of Oceana flying the Apollo Longshot Departure so we can get high enough to dump off excess gas and still get 10 passes before our period ends. We were also racing a setting sun...
As the fuel diminished on the departure that took us along the coastline, dump was secured and I cancelled the departure and asked for vector to Fentress. And we pointed the nose back towards land, Chris “Geyser” Andersen tapped burner to expedite our arrival. We immediately saw a huge orange explosion behind us. “Geyser” came out of burner and I asked if dump was secured. He said yes so double checking for fire warning lights as the orange flames dissipated, we surmised that the there must have been residual gas still streaming from the dump mast after he turned it off.