Fuel pump stayig on???

Have noticed when i park the truck up that the fuel pump is staying on for 5 mins or so despite it being off and locked up! I'm assuming it is the fuel pump as i can't see what other motor is down the back? Like i say, it hums away for 5 mins or so following shut down. It s a Disco 1, 96 model V8.

Is this right or should i be investigating further?

Cheers
Ritchie.

Can't think of anything else at the back whick would hum.

Maybe the fuel pump relay is sticking?

Thats what i thought too, gonna have a look for the relay i thinks.