Originally Posted by
OAP Pete
From ex Auto sparks [ retired now 13 years ] fully conversant with Bosch "K & KE" system...What you have hear is the Pump is " locked up...siezed "...when you bridge the Relay out, the Pump draws 9 amp normal [ if 044 pump fitted then 10 amp ]...the 12v gets "loads up" hence your getting 9 volt...so the pump is Duff...but watch there is no "Rust debre" in the Tank, as for sure the Tanks rust in the inside over the years....removing the Pump should show this, so dont fit new Pump untill new tank fitted, of course it can be the pump has just siezed !!...hope of help. Peter
thanks Peter, you was 100% on the money. What was throwing me was I’d bought a new pump off eBay and was giving me exactly the same issue as the one id swapped it for….. this afternoon I tried on a really old Bosch pump from my spares and worked no problems at all. I’ll send the duff pump back and just buy a Bosch 1. Thanks again Peter.