The easiest way is to remove the fuel pump relay, then insert an ammeter in terminals 30 and 87 or the two shown with arrows. The pump will run even with the ignition switch off. Six to eight amps is about typical, as I recall.
You should also check the terminals in the relay socket for signs of overheating. Regardless of how much current is flowing, the contacts inside the relay should not get hot. Heat results from undesirable resistance between the contacts or from a poor connection between the relay's terminals and the terminals in the socket. Once that resistance develops it will affect any other relay that's plugged in there. Heat promotes a poor connection and a poor connection causes heat, so it's a vicious circle. Usually by the time it gets that bad you'll see signs of the plastic melting around the contacts.
Thursday, December 8th, 2011 AT 11:12 PM