Can a stock fuel pump produce too much pressure?

Kern,
Only three things can really cause internal flooding of the TQ. All are easy to fix. Most likely are the rubber washers that seal the air horn projection to the black body. They sit in the black body, are black [ hard to see ] & are 'in the' hole adjacent to the pri main jet. Other things: fuel logged float or worn/leaking needle & seats.

If it is just the washers, just buy fuel resistant standard O rings 3/8" OD & 1/16" wall thickness. I always use these, never the ones that come in the lit, too flimsy.