My wife's 1991 Toyota Camery stopped running. I could start the car with starter fluid and would quit as the fluid ran out. I figured the fuel pump was out and replaced it. Still had the same problem. I replaced the EFI relay, still no good. With a test light I found out that there was no power to the electrical connection to the fuel pump, there is power to the sending unit. I am thinking that perhaps the power flows through the Engine Main Relay but cannot verify that with the electrical diagrams I have. On another site someone suggested that there is a switch on the Massive Air that has an effect to the power going to the fuel pump. I am unable to verify this also. I have spent $150.00 so far and am reluctant to spend any more on just replacing parts until I can get better information as these other parts are $80 and up.