I also have a Jetcat P-300 RX I bought it used with 2 years of the warranty remaining. The fuel pump failed after only several runs. I purchased a new fuel pump & sent the defective fuel pump to Dream Works. Then after several runs it read that it was a p-20 SX. I found on this site how to change it. Every other run it would go back to saying it was the P-20 SX. I sent it to Dream Works & they programed the ECU. 5 runs & the same thing again. All my battery's are always fully charged. Now when I put power to the ECU the starter motor runs. I sent both engines top Dream Works but George is in Germany for another 1 1/2 weeks. nAny ideas why this is happening ???? THANK YOU VERY MUCH !!!!!!!!!!!!! RICK