Hey whats up guys I need help fixing my fuel pump relay or main relay. I just changed my fuel pump new, got new spark plugs, got my ignition coil working and I think its my fuel pump relay. I heard that this is a common problem on third gen preludes??? Should I get a new relay or used if so whats the price difference and where is it located on the car? 1990 Honda Prelude 2.1 Fuel Injection Manual

First turn the key to ON and look at all the lights on the dash. The check engine light should come on with the rest then go off. Once it goes off then you have a signal to the fuel pump. It only primes till that light goes off. If the light stays on and the engine just cranks then it's the main relay. Most common cause the solder joints crack and in hot weather the voltage won't make it across the gap. Most of us re-solder it. It's on the left side of the fuse block under the dash. usually a phillips screwdriver and 10 mm socket does the trick.

ONE MORE THING. I too replaced my fuel pump 2 months ago but the original screen actually tilted down and out. The replacement just went off 90 degrees to the side. So it wouldn't stay running going around a corner. It would't pick up fuel with a low tank. So went back to the j-yard and got an original pump with the angled down pick up screen.

I'd try re-soldering your main relay before you spend money on a new one. I've had success with this method. Here's a write-up describing the process...
Main Relay Fix

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1991 Prelude Si ALB 4WS
2017 Ram Rebel