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I don't know what testing you have done? The fuel pump relay is in the under hood fuse box. I don't know engine liter size, it may not matter? I did notice the relay, in the diagram, has no terminal numbers, Sometimes that means the relay is soldered into the fuse box, you can pull it out?
If you want to replace the fuel pump regulator you are better off getting the whole fuel pump module I know its expensive.The problem is you went on line and there is a bunch of chatter about the fuel pump causing delayed starts. They are right. There is a TSB Nissan put out this includes the fuel pump and there is no mention of the regulator that I know of.
I don't know what relays and fuses you want to check, but your 1988 Nissan Sentra is equipped with a mechanical fuel pump which is located on the rear of the engine under the intake manifold.
Your vehicle is also carbureted, not fuel-injected, so If I had your vehicle and it was lugging out on take-off, I would be looking at the accelerator pump in the carburetor, not the fuel pump.
It is SUPPOSED to be starved for fuel when backing off of the throttle.
Have you checked the fuel filter to see if it is clogged?
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