We have a C4000 Forklift that has multiple issues. The dash is showing an error E-24. The accelerator sensor has been replaced. When you turn the key you can hear the propane flowing and can smell the propane. This seems to be coming from the intake area. There is no voltage to the fuel injector and it seems to be closed/not allowing propane through. I am not sure what would be causing the fuel leak but it could be related to the error code. What should I check next?