no power to fuel pump or cut off switch,power at F12 fuse and fuel relay,have swopped relay still no power to pump.
any ideas please

ford focus 1600 auto 2002

richard, February 2012

Yes if the main engine relay is not energising you wont get any power to the coil of the fuel pump relay and the rest of the injection system. The main relay is energised as soon as the ignition is ON via the diode V33
X, X, F, M,
X, X, U, A,
X, X, E, I,
X, X, L, N
v33, X, X,
fuse, fuse,

If that makes sense?

nigel, February 2012

thanks Nigel, are u suggesting I check the main engine relay, all the fuses are intact, and thats the only relay I have not swopped over to check

richard, February 2012

The fuel pump relay gets it's power from the "main engine control" relay via fuse#9 this relay is energised when the ignition is switched on through a diode in the fusebox, with this relay energised it puts power to one side of the fuel pump relay coil, the earth for the coil comes via the engines ECU when it gets a good signal from the immobiliser control.

The main engine control relay is the one below the fuel pump relay.

If you would like a copy of the wiring diagram contact me on nige110162(at symbol)hotmail.co.uk

nigel, February 2012