Very carefully clean and dry the area on the underside of the bowl where the pump link extends through the bowl.

Now, with TWO watching, one on each side; start the truck and observe to see if the fuel is dripping down the pump link, rather than the gasket.

Jon

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop