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Old 02-14-2011, 23:58   #1 (permalink)
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Fuel Pump Disabled - Mispositioned Relay?

Howdy!
I own a Ford 2006 F250 Super Duty truck which is presently used for plowing and salting operations during these winter months. Originally I was working on the truck today to find out why I have no brake lights or rear turning signals (the rear brake light on my salter is working fine).

I managed to start the truck, park it in my garage and work for a few hours (no luck with the lights so far) but when I was finished for the day I could not start the truck.

The starter works fine but it sounds like the fuel pump is not working.

Long story short I had someone giving me a hand who suggested I check the High Current Fuses and Relays under the hood as checking the fuses under the driver side fuse compartment didn't solve anything.

I watched him pull one of the relays from the compartment to inspect it and I am quite certain he could not remember where he pulled it out from by the look on his face. He proceeded to replace the relay back in the box. Not long after I was in a slight panic as my truck wouldn't start.

I am guessing here but is it possible that he placed a Full ISO Relay belonging to #302 HFCM in the #301 DRL#3 position by mistake disabling the fuel pump?
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Old 02-15-2011, 08:09   #2 (permalink)
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Re: Fuel Pump Disabled - Mispositioned Relay?

Does it still crank over? Aslong as it's switched back it should be okay. When you turn the key to the run position, you should hear the pump run for a few seconds, every time you turn it there. Try spraying starting fluid in the intake and see if it starts.
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Old 02-15-2011, 11:02   #3 (permalink)
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Re: Fuel Pump Disabled - Mispositioned Relay?

Hi Bert,
Thanks for the reply. The starter and battery are working well and the engine cranks over however I don't hear any noises coming from the fuel pump at all, good or bad.

My hunch (hope) is that he pulled out the fuse in slot #302 which is the HFCM relay, forgot where he took it from and placed it in slot #301 which takes the same Fuse Amp Rating/Relay but is labelled as DRL #3.

As Daytime Running Lights are involved I'm hoping that someone living in Canada with the same model truck as I can tell me how the fuses and relays are arranged in their Power Distribution Box before I try to take out the relay from #301 and place it in #302.

Hope I haven't complicated what seemed like a straight-forward question. lol
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Old 02-15-2011, 11:15   #4 (permalink)
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Re: Fuel Pump Disabled - Mispositioned Relay?

Page 213 in the owners manual shows the location of all of the relays. You are talking about the one under the hood? If you don't have the owners manual, you can download one here. https://www.fleet.ford.com/maintenan...ls/default.asp
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Old 02-15-2011, 11:17   #5 (permalink)
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Re: Fuel Pump Disabled - Mispositioned Relay?

Is that a diesel?
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Old 02-15-2011, 12:00   #6 (permalink)
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Re: Fuel Pump Disabled - Mispositioned Relay?

It is not a diesel truck. Thanks for the link but I do have the owners manual.

On page 213 it states that I should have a Full ISO Relay in slots #301 and #302. However in my Power Distribution Box there is only one relay in these slots and that is #301 DRL#3.

Looking through that chart I notice that there are only two locations related to the HFCM. One is #7 (For Diesel Engines only) and the other is #302.

I had a quick look in the fuse box and both of those slots are empty.
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Old 02-15-2011, 12:32   #7 (permalink)
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Re: Fuel Pump Disabled - Mispositioned Relay?

You should be okay with that then. Listen for the pump and if it doesn't run, check the impact sensor and see if it tripped.
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Old 02-15-2011, 12:47   #8 (permalink)
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Re: Fuel Pump Disabled - Mispositioned Relay?

Well that didn't work. By impact sensor do you mean the Fuel Pump Shutoff?
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Old 02-15-2011, 14:50   #9 (permalink)
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Re: Fuel Pump Disabled - Mispositioned Relay?

That's the part I mean. If it isn't tripped, you could check for power there when the pump should run. Like the first few seconds when the key is turned on. From there, the power goes through a fuel pump driver module. Not sure how to help with that. Did it start with spray in the intake?
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