prob the green relay, maybe a fues to the pump has blown.

somethims the cut off switch plays up, although it could still be on it may of gone dry, ive come across it on a few fords ive worked on, just a case of pull the switch up, push it down back into on postion, do that a few times to make sure.

its located behind the passange kick trim under the dash.

or could be that your out of fuel? maybe the sender isnt working right?

i would also check the plug on the tank, give it a little spray with some WD40.