What makes you suspect the fuel pump is pulling the voltage down? Where are you logging your voltage?
Laboured cranking is likely voltage related, 'losing sync' could be related to microcontrollers in the ECU browning out from the low voltage.Thanks
Zero issues at wide open throttle, it's just this weird laboured cranking and sometimes losing sync. Fuelling is fine, my car is currently continuously priming on ignition and that also has no interruptions.
I have a new map to try today with different trigger edge settings as it was mentioned that sometimes "falling edge" can cause this behaviour.
My next port of call is either a new crank sensor or a new battery, I haven't decided which yet.