thats a rare situation, i had to send all of mine in as they failed, had over 10 replaced, killed the life of 2 of my engines because they would get the air leaks and start running hot, the last time i needed one before i was going away for a race and they wouldnt send it because they were doing inventory,there service was bad enough to make me change cars because of the tank issues, one of the guys that still runs them at the track has changed over 18 so far, dosent seem to get a week out of a tank, even had the latest generation tank break after running it on the track for a few tanks