06-04-2021, 11:08 AM
I wonder if something needs 'reversing' or the like? If you replace the pressure switch on the AYC pump, you need to know whether it's PFL or facelift so Malc (@mpbvr4) can supply the correct switch.
Which makes me think - was your replacement pump from a PFL or FL? I wonder if this is potentially the cause of your current issues?