I have a nissan 720 1985 model that runs on petrol / LPG. I bought the car knowing that it wouldn't run on petrol properly cause there was a problem with the " fuel solenoid " ( I don't know what this is and how this work les or even if this is the problem information on this would also be good ). Every thing else runs fine on has but I would like to run it on both fuels. How can I fix these problems and tell if I have bad fuel parts e.g bad fuel pump , bad fuel solenoid , even bad fuel tank. And my car has a carburettor not fuel injected so it shouldn't be to hard to work on please any help will be appreciated