can not propane inside MH

Yes as mentioned in the last post I buy from a private party. Everything was working in it at that time. The only difference is I had him re-connect the original line back to the tank and I new there the tank was empty. After reading all the help messages I believe it must be the leak detector or shutoff valve but as of now I can not find neither a leak detector or a solenoid, nor a shutoff valve. The tank has to be shut off from one of the controls you mention and am trying to trace the system out. Thanks again for all the input. I realize it should probably go to a dealer/Shop but the bill would probably be more than the unit is worth. I will pursue the problem until I find the problem and at that point may be able to help someone else. Thanks again, I'm still looking.