It is the fuel pump in that tank. See how it works is there is a pump in each tank (lift pumps) then there is a switch valve and the high pressure pump on the frame and infront of that the fuel filter. So what happens when you select the tank it turns on that pump in that tank and that move a check ball in the switch valve so the fuel returns back to the right tank and lifts the fuel to the pressure pump as well. If one of the intank pumps go bad then it dies shortly after you switch tanks.
Wednesday, May 20th, 2009 AT 8:51 AM