Fuel Pump Question - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 10-16-2016
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Fuel Pump Question

2005 Ranger 3.0

Diagnosing a fuel delivery issue. To see if the fuel pump was running when I turn the key I put an 8' plastic hose into the tank through the filler tube and stuck the other end in my ear.

Turning the key on and off repeatedly it was, nothing, nothing, 2 second run, nothing, 2 second run, nothing, nothing...

MY QUESTION: Should the pump always run for at least 2 seconds when you turn the key regardless of pressure?

Thanks, Andy
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Old 10-16-2016
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Yes.

Open hood and open engine fuse box
The Fuel Pump Relay will be in there, FP Relay
Put you finger on it and have someone cycle the key on and off, same as you did for fuel pump test.
If relay is "clicking" on, and then off after 2 seconds, every time, then problem is the fuel pump itself.
If FP relay is also not "clicking" then could be relay problem or computer problem.

Ford did add Fuel Pressure sensors to some models but as far as I know 2005 Ranger didn't have that.
You can look to see, it would be on the Fuel Rail, held on by 2 bolts and have a wire connector and vacuum hose.
If you see something with just a vacuum hose that is the Pulse Damper, not a sensor.

The in tank fuel pumps do have an over pressure valve that opens to allow gas to flow back into the tank.
2005 Ranger will also have PATS(passive anti-theft system) which disables Fuel Pump Relay and fuel injectors if the PATS key is not read correctly, but you would get a fast flashing Theft light on dash if that happens

Last edited by RonD; 10-16-2016 at 11:22 AM.
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Old 10-16-2016
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Quote:
Originally Posted by RonD View Post
Yes.

Open hood and open engine fuse box
The Fuel Pump Relay will be in there, FP Relay
Put you finger on it and have someone cycle the key on and off, same as you did for fuel pump test.
If relay is "clicking" on, and then off after 2 seconds, every time, then problem is the fuel pump itself.
If FP relay is also not "clicking" then could be relay problem or computer problem.

Ford did add Fuel Pressure sensors to some models but as far as I know 2005 Ranger didn't have that.
You can look to see, it would be on the Fuel Rail, held on by 2 bolts and have a wire connector and vacuum hose.
If you see something with just a vacuum hose that is the Pulse Damper, not a sensor.

The in tank fuel pumps do have an over pressure valve that opens to allow gas to flow back into the tank.
2005 Ranger will also have PATS(passive anti-theft system) which disables Fuel Pump Relay and fuel injectors if the PATS key is not read correctly, but you would get a fast flashing Theft light on dash if that happens
THANK YOU!

I already tested the relay that a diagram online said was for the fuel pump, BUT IT WAS THE WRONG DIAGRAM!
Your post motivated me to double check the relay and you sir hit the nail. I swapped it with another relay for the AC and I'm up and running.
Once again, thank you and thanks to the folks at Ranger-Forums.
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Old 10-16-2016
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Good work

Thanks for updating the thread and posting the FIX
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