Gas tank problem (My Summer Car)

Assembled the car, it started up a little robotic
Then I played again And saved
And the car stopped starting And gasoline started leaking from the gas tank I tightened
all the bolts 4 by 7
І one by 12 with a key and tried to rebuild it many times
And used MSCeditor does not help
Gasoline still flows
Sorry for the mistakes, not good I know Russian