Yeah, I'm not convinced of the fuel pump either, with only item pointing to it being mere noise. Since it's one of the few key components I have not upgraded in the year since getting the car thought it would be a good time, and some chance it is the issue.
Injectors are all new (034's nice conversion kit) last spring, general major tuneup items as well. Everything save plug wires that you would think of doing to make a 23 year old car reliable for daily driver use has been done. Didn't do plug wires simply because of the shocking cost for the 20 valve set - my little protest...
Full throttle acceleration seems down a bit as well sometimes, other times it's normal. Fuel consumption slightly off, but not tracked precisely enough to say that definitevly. It's been going on for a month or more so not bad fuel.
I notice it when steady state driving at freeway speeds. In making those tiny pedal adjustments to match speed with traffic. Apply a tiny bit of gas and a faint falter occurs - not bucking or anything , just faintly felt hesitation. Sometimes I have also felt as I let up barely on the gas it will actually accelerate faintly. So behavior I would typically call a flat spot in the carburetor days. Thoughts?