1999 F-250 Fuel Pump issue.. relay or fuse? - Ford Truck Enthusiasts Forums



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1999 F-250 Fuel Pump issue.. relay or fuse?

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Old 11-26-2011, 02:46 PM
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1999 F-250 Fuel Pump issue.. relay or fuse?

Hey guys, my fuel pump isn't running and I can't start the truck. I just checked the voltage at the pump connector. I only got a 4.6 volt reading from one wire. I checked the inertia switch and it wasn't tripped.

I'm assuming there's an issue with the fuse, inertia switch, or relay. My truck did not come with an owners manual so I cannot locate the fuel pump fuse. Does anyone know which fuse it is? My fuse panel is located under the steering wheel.

I've heard the relay is behind the radio, is there anything I should know about taking the radio out to access it?

Would appreciate any help..

Jason
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Old 11-26-2011, 02:59 PM
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Okay, finally found the owners manual. Checked all fuses associated with fuel pump, they all looked good and had 11.67 at the fuse panel.

Onto the relay, how do I remove the radio?
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Old 11-26-2011, 03:04 PM
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Gas or diesel?
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Old 11-26-2011, 03:24 PM
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Gas 5.4L. Just managed to get radio off. Removed a black cap that has two relay sockets. only one blue relay inside though. Listed as Ford TBB89. Is this the fuel relay?
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Old 11-26-2011, 03:34 PM
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No. The blue one is your flasher for the turn signal. It's the black relay with no writing on the top, I believe.
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Old 11-26-2011, 03:43 PM
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Just figured that out. Thanks for the help.

I don't see a black one but I'll keep looking. Is it behind the radio as well? According to the manual is says its in location #33.

Moreover, I just checked the green wire going into the Inertia switch and it also has 6.4 volts. Does this verify that its a relay issue?
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Old 11-26-2011, 03:47 PM
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Try this thread.

http://www.ford-trucks.com/forums/11...-location.html
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Old 11-26-2011, 04:02 PM
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Thanks. I looked in that little relay box but I only had a flasher relay. The other slot did not have a relay.. Maybe its under the hood...
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Old 11-26-2011, 04:45 PM
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Is your F250 a Super Duty or a light-duty? The circuits are different and the location of the FP relay is different between the two versions.
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Old 11-26-2011, 05:00 PM
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1999 F-250 Superduty 4x4 5.4L
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Old 11-26-2011, 05:33 PM
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Unfortunately Ford does not have the 99' f250 SD owner manual on their site .. I've lookeds through all the other manuals for similar trucks, but cant seem to find any that have the same relay/fuse setup. My relays start from #301 up under the steering column. I only found one full relay under the hood, with 2 half relays sharing the same box...

Any help? I'm desperate, as I need to move truck by tomorrow...

Thanks
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Old 11-26-2011, 09:29 PM
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Are you SURE about the year of your truck? I went through the schematic of the thing and it does not show the fuse/relay numbers like you describe until after 2002. I can check it by VIN if you want to pm it to me.
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Old 11-26-2011, 10:14 PM
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Carltonwebb- Thank you, but I just got it going.

After switching around all the relays many times, I finally was able to get the fuel pump running by pushing Relay 302 to the side. After it closed and opened a few times I was able to get it started while giving gas . All seems well now. I guess it must have been corrosion on the relay socket terminals?

Will have to see how long till it happens again..

Wish I knew all this before I pulled my radio and broke the retaining clip.
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Old 11-26-2011, 10:16 PM
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Glad you got it going. Just realized you probably not able to pm yet. Good luck
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