on a 95-97 it's easy, no need to drop tank, just have to remove trunk floor mat, trunk trim cover, seat cushion and back and then 8 bolts on the set plate on top of tank, 3 nuts on fuel pump bracket, disconnect hose and pull it out!
not sure if a 1990 is the same but I bet it is a very similar procedure
The car has been harder to start the last couple weeks and now acts at times like it's starving for fuel when I hit the gas then runs ok. The other night on my way to work, I took the exit ramp off the highway and my car stalled out when I was almost stopped. It started back up and stalled again at the next light.
My Nissan did the same thing when the fuel pump was going out a few years ago. I'm planning on changing the fuel filter first then the fuel pump if it doesn't fix it.
It isn't throwing any codes, it's been running rough for a few months now. I installed new plugs and wires and it helped a bit but not much. I was looking online for a MAF and they are almost $400 for what I've seen from a couple I found that were rebuilt.
I've been planning on changing the filter and pump before my son starts driving the Lexus here soon and doing the maintenance it's needed due to previous owner not doing maintenance or repairs on the car for several years. If it's still having issues after replacing the pump and filter I'm taking it in to get diagnosed so I'm not wasting money on replacing good parts....