The pump is under the car, accessible from a small panel just in front of and slightly inboard of the left rear tire. The filter is right next to it.

You haven't mentioned how long you've owned the car (and mileage when you bought it), maintenance and repairs completed and those deferred, or many other things.

Have you physically inspected the K40 relay? Sometimes you can look right at them and see the burning near a solder point.

Have you checked fuses? IIRC the ECU fuse blows if the fan for the electronics shorts out.

The easiest thing to do (after you check the fuses) is to change the KPS (Crank sensor) as suggested above. It's a known trouble area and is quick to change and inexpensive (at least online) to boot. On this engine it's rare that the KPS throws a code. And disconnecting it will mean the engine does not start.

If you suspect the fuel pump, it's very easy to change, particularly if you have the clic pliers for the clamps (otherwise you have to cut them off and then replace them with gear-type). Do the filter at the same time.

Good luck.