Had to install new guts (Fluidmaster) in the tank of a Gerber brand
toilet. Had a problem with water spewing out between the tank and
bowl upon flushing.

We retightened every nut (flush and fill valves, the 2 bolts holding
the tank to bowl). Tried two different (new) gaskets between the tank
and bowl. To no avail.

It's like there's a hole somewhere, the gasket isn't reaching far
enough (I think it is, but not 100% positive), or ??? Never had this
kind of thing happen so I'm at a loss as to what's causing it.

Help!

Thanx
Renata