Hello I have a water in tank problem and I think it is making my truck to drive rough. I have 1988 6.2l chevy p30 step van. I tried to drain the water but I could find how to drain the fuel or water. I saw one where you drain water from fuel tank but my truck starts and fuel dont come. Can anyone please tell me how to drain fuel or water from truck and where the valve is located. I couldn't find the valve or fuel tank draining place.