Motor Turnover/ Solutions

We got our flywheel to spin and the motor and crankshaft are turning over but there is no combustion (see attached video). We believe it has either something to do with our spark plugs, fuel tank, or fuel lines, or just a lack of gasoline in the car, but most likely one of the first three. We have the fuel tank off and are going to begin to clean it, then put it back in and put fuel into it and see if it works. Here are some pictures: