Fuel Gauge Problems...

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Jan 29, 2006 | 02:05 AM

Todd Dietz

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Fuel Gauge Problems...

1984 6.9 diesel, dual tanks....when either tank gets down around 1/2 the needle drops off to dead empty? Gauge? Sending unit? Float? Where do I start?
TIA
Todd

Jan 29, 2006 | 09:18 AM

IHdieselfan

Tuned

Joined: Oct 2005

Posts: 392

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From: Panther Branch, NC

Sending unit 9 times out of 10

Jan 29, 2006 | 09:49 AM

CF-DRG

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From: Vancouver Island

Its sounds like your sending unit, but it shouldn't effect both tanks. Each tank has its own sending unit... So one of them should still work.. It would be mighty coincidental that both went at the same time and in the same place (at half a tank)... When you switch between tanks (with the engine off) can you here a clunk comming from the switching valve (under the drivers frame rail)????

Last edited by CF-DRG; Jan 29, 2006 at 10:02 AM.

Jan 29, 2006 | 12:04 PM

Todd Dietz

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Fuel gauge...

Yea, I know both tanks are working because I have run them out before. I am not sure they both do it at the same exact spot, but one worked pretty good when I got the truck. N ow they both do it.
Todd

Jan 29, 2006 | 08:06 PM

Dave Sponaugle

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Joined: Nov 2003

Posts: 21,285

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From: Nutter Fort, WV

Soon after that you can expect the fuel pickup tubes to break off or crack.
Either way the truck will start running out of fuel between 1/4 and 1/2 tank of fuel.
Big tank, no baffles, sloshing fuel not good for the gauges and pickup tubes which are the same unit.

Jan 29, 2006 | 08:11 PM

Todd Dietz

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Where is the cheapest to buy?

Where is the cheapest to buy new sending units for the tanks? Let me know. Thanks,
Todd

Jan 29, 2006 | 08:20 PM

94turbodiesel

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From: Post Falls, Idaho USA

I believe Ford is the only source. Try Ford Parts Online. I haven't heard of any aftermarket sources and I believe they'll run about $100 each. I know a couple guys who have had to replace theirs. The front and rear tanks take different units, too.

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Jan 29, 2006 | 08:30 PM

Todd Dietz

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Check this....

<table align="center" border="0" cellpadding="3" cellspacing="0" width="100%"><tbody><tr><td class="tabletext" style="border-top: 4px double rgb(51, 0, 153);"> FUEL GAUGE sending unit, F250 Pick-Up, Diesel </td> <td class="tabletext" style="border-top: 4px double rgb(51, 0, 153);" align="center" nowrap="nowrap"> 84-87 </td> <td class="tabletext" style="border-top: 4px double rgb(51, 0, 153);" align="right">
</td> <td class="tabletext" style="border-top: 4px double rgb(51, 0, 153);" align="right" valign="top">
</td> <td class="tabletext" style="border-top: 4px double rgb(51, 0, 153);" align="right">$41.24</td> </tr> <tr> <td class="tabletext" colspan="5"> Electrical - Chassis electrical - Senders - Fuel gauge sending unit </td> </tr> <tr> <td class="tabletext" colspan="5" style="border-bottom: 4px double rgb(51, 0, 153);"> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tbody><tr> <td class="tabletext">
</td></tr></tbody></table></td></tr></tbody></table>
This the only one they list for a diesel?

Todd