[oab_au]

I agree that it is a 1 Ohm resistor.
The early pumps used around 1 Ohm, the later (more efficient) pumps are around the 0.28 Ohm that the Mitsubishi has, the value isn’t really critical, the value controls the pumps flow rate, when the engines demands for fuel is low, like idle, cruise, etc. If the resistance is too big it may cause problems of lean fuel, missing, if too small, the pump would run at high flow, heating the fuel.
When the engine needs full flow, 12V+ it turns the modulator on to supply the pumps ground.

If the pump was to operate at full flow all the time, at times of low engine fuel needs there would only be a small flow through the injector, fuel pressure regulator circuit, back to the tank. The excess would be blown off through the pump’s relief valve to be circulated back through the pump, heating the fuel at the pump. To prevent this happening the ground in the modulator is turned off to leave only the 1 Ohm resistor ground that drops the pump’s voltage to about 6V to reduce the amount of fuel blown out the relief valve reducing the fuel heating.
All the fuel pressure is set by the fuel pressure regulator at 36.3 psi against the manifold pressure, and no other regulation is done.