Hi All,
First, thanks to all of writing such great posts that have helped me solve many issues over time.
I have a 97 4.6L with a fuel pump issue. The truck likely has about 160K miles on it (the odometer quit a long time ago).
The truck tries to turn over, but will not. There's no fuel getting to the injectors and the pump does not kick on when the key is turned.
I've tested the fuse and the relay, both are fine.
I've traced the problem as far back as the wiring.
The wires leaving the relay show 12.5V when the relay kicks on, but when I check for voltage at the connector nearest the pump, I only get 5V.
Is this just a case of bad wires? If the wires were shot, I wouldn't expect to see any voltage at all. Is there something else along the line that would cause the voltage drop?
Thanks,

Alex Amyot
Tampa, FL

 

inertia switch??

 

The inertia switch is not thrown, but that makes me realize I should check if it is malfunctioning. The switch may be doing something screwy and acting as a resistor. I'll let you know how it goes.

 

Ohhhhh, I was measuring voltage at the wrong connector. False alarm, everyone. I reached up above the tank and felt what I thought was the wiring that came from the pump, but it was something else. After a while of troubleshooting the voltage issue, I thought I'd better drop the tank and make sure I knew what I was talking about. Turns out I didn't. In the end, it was just a burned out pump, easily replaced while the tank was dropped. Thanks to anyone who read the thread.