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Research: Fuel pump and Fuel filter are inside the tank. Can only get to them from under the vehicle, need to remove exhaust and bunch of shields, need to empty tank as much as possible. Actually have to reach into the tank to fish out the pump it seems. No idea how easy it is to update those pumps. Was going to go dual Walbro and bypass the entire internal fuel filter assy, do a -6an line and standard fuel system. TBD
Also, unlike the Supras where you supply a TTL signal for low or high fuel pump voltage, the Z4 has a fuel pump controller (ECU) which regulates fuel pump voltage via CAN messages. Yikes. I can bypass it all and control the fuel pump via a relay, but from some reading:
"
The EKP control unit controls the EKP according to the system mode of the fuel supply system in the operation of the vehicle. The fuel output rate of the EKP is activated and regulated according to a given characteristic curve via engine speed recognition. The reference variables for this are the fuel requirement of the engine and the fuel circuit systems.
Emergency operation
If there is no communication with the DME (engine ECU) of this is defective, the EKP (Fuel Pump) control unit switches to emergency operation. The electric fuel pump is fully activated."
If this is correct and pump runs at full voltage, then I can just regulate it with a FPR up front.
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