If the fuel pump is developing pressure and you're convinced the connections are good, either the fuel isn't making its way into the cylinder or there's no spark to ignite it.
Could the removal and movement of the fuel tank have dislodged some debris that is now blocking a fuel line?
Have you checked that the spark plugs are firing while attempting a start?
Could the removal and movement of the fuel tank have dislodged some debris that is now blocking a fuel line?
Have you checked that the spark plugs are firing while attempting a start?