Hi guys.Hope to get a little clarification on the fuel pump system on a 06 E350.Background is car died on highway.Checked fuel rail,no gas at port.Car runs with carb cleaner sprayed in throttlebody.Questions I have there are supposedly 2 pumps,right and left.How can I tell which one is bad? Also can someone point me to a fuel pump relay loacation for this vehicle? vin # WDBUF56J86A830157.