It is.
Scared the daylights out of me first time I used it.
Dumped a bunch in the fuel tank ,fired up the Bullet. put-put-put-put-put-put-put-put-put-put-HUGE-CLOUD-of-BLACK-out the silencer
and then the output subsided and returned to normal.
Every so often a dollop or glug ( technical terms
) goes in the tank as a maintenance dose.