With the Fuel, you want to measure the fuel delivery volume at pressure.
Easier to test with electric pumps, with a mechanical you may need a temporary fuel supply to be able to rev the engine with the mechanical pump disconnected.
You need to add some restriction at the fuel output to create pressure. If the pump is internally regulated, need to be careful to just bring pressure up to the regulated set point.
Setup fuel outlet into a empty gas can, and time how long it takes to fill to figure the fuel volume delivered.

This is just a static test with the car under zero G-Force.
You can also lift the cars front end to simulate fuel delivery under acceleration.