my 93 grand voyager minivan leaks gas from fuel injector why

There are O-rings at the injector and fuel rail joint that may be leaking, but more likely the injector body itself is the problem. This is fairly common on older Chrysler products and a very dangerous situation.
l normally recommend replaceing all of them at the same time, but at least replace all the O-rings if you only replace one injector.

Chryslers are garbage, in general.

o rings l just did one a week a go your looking at $87 if you due it yourself..good luck

sounds like a defective o-ring to me..