I literally just went through this recently and can confirm Dale is leading you in the correct direction. There is nothing wrong with the Supra pump, but it costs more than the Walbro pump without a benefit really. I bought my Walbro 255 from Banzai and cannot stress how important it is to do the same (or any other respected RX7club vendor like IRP/etc.). Yes, you can get the pump cheaper and in 2 days from Amazon... but you risk a fake. Plus the vendors deserve the small margin off the pump. Don't be cheap : )

As for the install, it is literally a 100% drop in. The only thing you will need to do is cut the power/ground connector on the fuel hanger assembly and slip crimp on the new Walbro connector (5 minutes working slow and heat shrinking it after). Pump is super quiet as well. Can't recommend this enough.

 

The Walbro supposedly draws less current than the Supra/Denso with the same/better flow rate. For that reason alone it is a better choice IMO.

 

This may be essentially accurate, but not technically accurate

Esoteric details:

Any pump will have different characteristics based on pressure, flow and temperature. Think of a fuel pump that pushes a liquid similar to a turbo charger which pushes air. Different pumps will have different characteristics at different pressures (and temperatures).

So what you could have (not having the specific pump graphs) is a supra pump that may flow more (GPH) at standard pressure (atmospheric) and temperature, but may flow less than pump 2 at a different pressure or in pump vernacular, head.

 

Not sure if this is accurate, but if it is then the Supra pump (see the Denso 260 at the bottom of the chart) flows significantly better at 43 psi than the Walbro:
http://www.roadraceengineering.com/fuelpumpflowrates.htm

 

very true, but what I was referring to was current draw under equal test conditions. I recall a review of the Supra/Denso pump that was evaluated under test conditions with a variety of other aftermarket pumps including the Walbro. The Supra demanded more current to flow about the same volume. Not saying the supra pump is bad, but it does seem to require more current. Unless the wiring is updated, I personally don’t think it’s a good choice for a stock, unimproved 25+ year only RX7 based on the voltage drop tests I ran on my FD. Just my .02, YMMV...