Leaky Edelbrock Fuel Pump

And a regular tap wont work unless you grind it shorter or buy one. I've dealt with this a lot at work. Most shops need to make there own tap to get the L1 right if they can't go any deeper when even the short taps are not short enough. Probably why other pumps are 1/4 NPT, that would give you more tap depth.

This might help if someone is looking to tap theirs deeper or need to repair.

McMaster-Carr

And if you want it right.

McMaster-Carr