Heater fan blows all the time

If the burners are strong when it fires up, it seems that if the gas pressure is not set correctly at the entrance and exit for a lot of gas. Call your local gas company and tell them you think you smell gas. This will be the roll. It takes a special gauge to adjust pressure and do them after soap for leaks. This is the problem for a lot of gas will cause it to be very strong.You need to get them out anyway high pressure can be dangerous.