Hi, my car is 1993 corolla. After driving a while, a lot of fuel is
leaking from the purge canister, and it stops leaking when I open the
gas tank cap. I can drive with loosing the cap and there is no leaking
happen again.

I just replaced a new gas tank recently and I wonder if the leaking is
caused by the improper installation of the gas tank?

Can anyone give me help to figure out what problems cause the fuel
leaking?

Thanks,
Fred