98 Miata Fuel Pump Cost?

In the US there is no 98 model, just 99 models built in 98
An aftermarket pump is ~$100US  in the USA
A "kit" is also needed ~$15US
Next, the pump comes with a pigtail that must be spliced to the Tank
connector from the old pump.
One brand name Walbro

How did they diagnose a pump failure? (Power at tank pump connector, and no
noise from pump, pressure check, etc.?)
Besides the pump at 80,000 mi
Fuel filter under car
Possibly the fuel pressure relief  valve (mounted on the pump & gauge sensor
assy)
Possibly the fuel pump relay
Fuse

The pump is cooled by the fuel in the tank. running habitually with minimal
fuel can cause the pump to fail early. (This is not too common on a miata,
due to the shape of the fuel tank if several gallons of fuel are in the
tank.)

Yes, it's a 99. I was 1/2 awake when I made that post.

I have no idea how they diagnosed it, but that was the problem.

I just went ahead and let them do it, $380.00 including tax.

The dealer wanted $340.00 just for the pump! I didn't even ask
them how much the labor would be. lol

Oh well, only the second repair I've ever had on the car, the
other being a new AC condenser that had a small hole in it
from a rock hitting it.