Fuel guage - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 02-10-2011, 10:39 AM Thread Starter
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Fuel guage

So on my lunch break i stopped to put in some diesel since i was down to a 1/4 of a tank. Put the nozzle in started it up and got back into my truck, Watched for the needle to start to climb and after a couple seconds it didn't? so i looked to make sure it was pumping and i had 7 gallons in, kept watching the needle and nothing, I put in 20 gals and no move in the needle, got back to work shut it off and turned the key back to koeo the guage was still on 1/4 tank. Anyone know whats going on? the only thing i can think would affect it is on my way out some idiot in front of me who wasn't paying attention slammed his brakes and i had to slam mine and came to a pretty hard stop. But other than that im clueless

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post #2 of 7 Old 02-10-2011, 10:54 AM
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I had a "lazy" fuel gauge last year. It was the fuel sending unit. It had gotten wet (from fuel) as I had a crack in my Transfer Flow fuel tank. I had to replace the fuel tank but not the sending unit...I've had no problem since it has not been subjected to the wetting.

I don't think the 2005 Ford F-250 had a 40-gallon behind-the-axle fuel tank but Ford Doctors has an article:

Diesel Technician Society

Hope this helps direct your troubleshooting.

Good luck!

Jonathan
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Jonathan D. Howell
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post #3 of 7 Old 02-10-2011, 11:01 AM Thread Starter
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I don't have the behind axle tank, could this still be my problem? what do i need to do check my tank for cracks?

2005 F250 Reg cab LB XL

Airaid CAI
4" MBRP straight pipe from the turbo back.
RCD EGR Delete
Upgraded Banjo Bolts
Zoodad Mod
Swamps HOT FICM
Lariat Captains Chairs with woodgrain center console

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post #4 of 7 Old 02-10-2011, 11:20 AM
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If you had a crack in your fuel tank I think you would know it. The crack in my tank was very small but a drip even every few seconds makes a fairly large slick underneath over the course of a day. The top of the tank is where I would look for signs of wetness. It could be wet from accumulated debris not necessarily fuel. Another way to check for sending unit function is to use a voltmeter on the backside of the fuel gauge (I would imagine a lower voltage reading ) or to query the fuel tank through the OBDII port (likely to report a percentage full not a gallon figure).

When this happened to my truck, there was an associated DTC as well: I think it may have been P0460 but I am not certain...I cleared it out from the keep-alive-memory after the problem went away.

You may find the OBDII guide from MotorcraftService.com helpful too:

http://www.motorcraftservice.com/vdi.../DOBDSM502.pdf

(the link is for 2005 Fords with the 6.0L diesel)

Check for DTCs and see if that helps direct your troubleshooting. Good luck!

Jonathan

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post #5 of 7 Old 02-10-2011, 11:25 AM Thread Starter
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Thanks Jonathan!

2005 F250 Reg cab LB XL

Airaid CAI
4" MBRP straight pipe from the turbo back.
RCD EGR Delete
Upgraded Banjo Bolts
Zoodad Mod
Swamps HOT FICM
Lariat Captains Chairs with woodgrain center console

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post #6 of 7 Old 02-10-2011, 12:08 PM
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mine does thas all the time on my 2000 and my 2005. turn the key off an back on usually fixes it.

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'00 F 350 4x4 7.3 PSD
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post #7 of 7 Old 02-10-2011, 12:32 PM Thread Starter
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^ i tried this when i got back to work and it didn't fix it

2005 F250 Reg cab LB XL

Airaid CAI
4" MBRP straight pipe from the turbo back.
RCD EGR Delete
Upgraded Banjo Bolts
Zoodad Mod
Swamps HOT FICM
Lariat Captains Chairs with woodgrain center console

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