ColeSlaw
New Member
- Joined
- November 8, 2012
- Messages
- 1
- Reaction score
- 0
- City, State
- Lynchburg, VA
- Year, Model & Trim Level
- 97 Explorer 5.0 AWD
Hey everyone!
So here's my problem, my 97 Explorer 5.0 sat for about two years and after it failed to start I discovered the fuel pump wasn't working. So I replaced it but before I connected the new one I decided to check the fuel pump wiring to make sure all was good, it isn't.
With my lack of electrical experience here's what I've been able to figure out... I'm getting constant power to the fuel pump when the key is in "run" position, according to my Haynes book I should only have power for about three seconds and then the computer will shut the fuel pump off. It also doesn't matter if the inertia switch is on or off or if I pull the fuel pump relay out, it still has power.
I've done the best I can at tracing wires off and on for the past two weeks and the best I can come up with is this:
With the inertia switch up (in the tripped position) I get 11.5V at the fuel pump connector.
With the inertia switch down I get about 6.5V.
Fuse #19 cuts the power when pulled with the inertia switch switch down but when it's up I get 9.6V.
Pulling fuse #11 will also cut power if the inertia switch is up but gives power when the key is turned to run, 9.6V that drops to 5.4 after a second or two when I assume it's supposed to have all power cut.
I think the PCM relay and diode are working properly, both cut power when pulled.
That's all I've got so far, I'm pretty much at a loss here and not sure what to try next, any help you can give is greatly appreciated!! Sorry if my descriptions seem vague or don't make sense, I am not a very good electrician haha. Thanks, Daniel
So here's my problem, my 97 Explorer 5.0 sat for about two years and after it failed to start I discovered the fuel pump wasn't working. So I replaced it but before I connected the new one I decided to check the fuel pump wiring to make sure all was good, it isn't.
With my lack of electrical experience here's what I've been able to figure out... I'm getting constant power to the fuel pump when the key is in "run" position, according to my Haynes book I should only have power for about three seconds and then the computer will shut the fuel pump off. It also doesn't matter if the inertia switch is on or off or if I pull the fuel pump relay out, it still has power.
I've done the best I can at tracing wires off and on for the past two weeks and the best I can come up with is this:
With the inertia switch up (in the tripped position) I get 11.5V at the fuel pump connector.
With the inertia switch down I get about 6.5V.
Fuse #19 cuts the power when pulled with the inertia switch switch down but when it's up I get 9.6V.
Pulling fuse #11 will also cut power if the inertia switch is up but gives power when the key is turned to run, 9.6V that drops to 5.4 after a second or two when I assume it's supposed to have all power cut.
I think the PCM relay and diode are working properly, both cut power when pulled.
That's all I've got so far, I'm pretty much at a loss here and not sure what to try next, any help you can give is greatly appreciated!! Sorry if my descriptions seem vague or don't make sense, I am not a very good electrician haha. Thanks, Daniel
