on April 3, 2015, 9:48 am, in reply to "Re: vauxhall astra g y17dt diesel in ecu plug"
I have the exact same issue with my 2002 Combo Van Y17DTL.
Every now and then I get a random fault code due to diesel in ECU plug and like you traced it to this connector on the pump.
I keep meaning to sort it but never get round to it.
Regards
Iain