Gonna have to get a sparky to have a look as my understanding of auto electrics is limited

Is there any reason why the new relay would trigger the pump with no ignition on. If I touch the + wires at the battery and only the - wire from the new loom, the pump starts. If i conenct the negative leads from the car first and then the negative lead from the new loom it doesnt.

Anyway, now the system is pressurised it starts on the key and runs, but I suspect its because there pressure there and it will just cut out after a while. Its tight in the garage at the minute, will have to try again tomorrow.