hi, i am having troubles with my 500 polaris efi. The engine was just rebuilt and it ran strong for a few days and died on the trail. It has spark and good compression. The ECU flashes code 22 at me (pto side injector), and the injectors do not inject gas. The polaris dealership by me lent me a good ECU and i switched them to see if it would solve any problems. It did not. i checked all the grounds, and cleaned them. Still nothing. I can only hear the fuel pump prime once, and does not prime after each pull. Help, please!