no power to fuel pump or inertia switch - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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Old 03-26-2011
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no power to fuel pump or inertia switch

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I have a 1997 Ford Ranger xl 2wd with 3.0 liter. bought the truck with a blown engine. had three broken connecting rods. anyway, I installed a new engine and now I find that I have zero fuel pressure and I can't hear the pump when the key is turned on. So, I checked the interia switch (GOOD). removed my bed to get to the fuel pump and found no power at the pump. went back to interia switch to check for power (I know, I should have did that before removing the bed.. live and learn..lol) (NO POWER). when I turn the key on I can hear the relays clicking but I can't hear the pump. not sure which is the fuel pump relay but all three have the same part number printed on them so I switched them (still nothing). can somebody tell me which is the fuel pump relay and where the fuse is. I have a haynes manual but it don't tell which or where the relay or the fuse is located. I checked all fuses under dash and in the power distrubution box and they are good. I found one fusible link (not sure what it went to) and it was good. how can I test the pcm? any troubleshooting tips? thank you

Last edited by 50mustangs; 03-27-2011 at 12:09 PM.
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Old 03-26-2011
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I read a couple forums that stated that the check engine light didn't come on when the key is turned to on position indicating the pcm is not getting power. I checked mine and the check engine light doesn't come on. maybe my pcm isn't getting power. from what I've read the pcm tells the relay when to energize the fuel pump. I followed the wire with the fusible link and I found it went to something not installed by Ford probably a cb or some kind of accessery. where can I find the fusible link? thanks

Last edited by 50mustangs; 03-27-2011 at 12:11 PM.
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Old 03-27-2011
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anybody know where the PCM power Diode is located?
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Old 03-27-2011
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Originally Posted by 50mustangs View Post
anybody know where the PCM power Diode is located?
It's located in the power distribution box under the hood. The PCM relay is also in this box.


Also check fuse #11 in the fuse box at the end of the dash on the driver's side.

Last edited by Takeda; 03-27-2011 at 02:37 PM.
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Old 03-27-2011
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I do have power on both sides of #11 fuse. what does the diode look like? thanks

Last edited by 50mustangs; 03-27-2011 at 03:00 PM.
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Old 03-27-2011
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It is in location #19 in the power distribution box.
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Old 03-27-2011
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Check Maxi fuses 2 (PCM Power) and 3 (Fuel/Anti-Theft) in the underhood box
Check the bolted grounds on the DS of the upper radiator support near the battery and the center of the firewall near the PCM.
Individually swap out the Fuel Pump Relay and PCM Power Relay w/ another identical one in the box.

The locations of all relays, fuses and the PCM Power Diode are in the owners manual. Look in the "Roadside Emergencies" section. If you don't have an O/M, use the link in my signature to view one online.

To the best of my knowlwedge, there is only one fusible link in a 97 and it is between battery positive and the voltage regulator on the alternator.

[Just in case: you do know that the pump only runs for about 1 sec if the key is turned on but the engine is not turning, right?]

Last edited by V8 Level II; 03-27-2011 at 04:28 PM.
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Old 03-27-2011
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FOUND IT!!!!! thanks guys the information you've provided me was very valuable and I've learned alot. two different thing were wrong. first thing was the wire at the fuel relay to the intertia switch and PCM (dark green an yellow wire) was very corroded under the distribution box. I cleaned that wire up and reinstalled. checked for power at fuel pump and I then had power. Still no noise from pump or fuel pressure. pulled pump and found wire broke. installed new pump and assembly. hit switch and heard hummmmmmm. bled air out of fuel lines. hit the starter and she fired up and purred like a kitten.
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Old 10-07-2015
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Originally Posted by 50mustangs View Post
FOUND IT!!!!! thanks guys the information you've provided me was very valuable and I've learned alot. two different thing were wrong. first thing was the wire at the fuel relay to the intertia switch and PCM (dark green an yellow wire) was very corroded under the distribution box. I cleaned that wire up and reinstalled. checked for power at fuel pump and I then had power. Still no noise from pump or fuel pressure. pulled pump and found wire broke. installed new pump and assembly. hit switch and heard hummmmmmm. bled air out of fuel lines. hit the starter and she fired up and purred like a kitten.
Figures, in my experience, 90% of electrical problems I've encountered have been a bad ground or broke wire. But always time consuming and tedious. Glad you found your problem and it was a free or cheap fix!!
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