I have a Kamatsu forklift with a Nissan 4 cylinder engine. It has a Impco Vff-30 propane system on it. It was running fine then all of a sudden it didn't want to start. It will run for about 30 seconds and it stops. Acts like its out of propane. I did notice that there is no electrical wiring on the propane system? Is this normal. The forklift was bought from a com[any that refurbishes forklifts. This thing is stripped. No lights, no horn, no blinkers, etc. Basically it is just hydraulics and a motor. Thanks for your help in advance. All help is greatly appreciated.