Fuel Pump Roulette

SG4247

My understanding is the ecu turns on the pump when you hit the ignition switch to the “on” position, foot off the brake. You should try this by pressing once for ACC, and a second time for “on” - foot off the brake.

At the on position, the pump will cycle for a second to raise the fuel pressure for starting. It should raise the pressure to factory spec, like 50 psi. Once the driver presses the start button a third time - foot on brake, the pump will come on and stay on while the engine is running.

Two relays in series, may not work well, because you have two coils in series, there may be varable resistance and heat. I would try the OEM relay only with the Aero pump and just keep an eye on the 15 amp fuse.