Question about 1990 Ford F350

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1990 F350 dule tank Fuel guage does not work

I have a 1990 F350 Dump body diesel(7.3) duel tank and the fuel guages on either tank are not working.When I disconnected the wires on the front tank the guage went to full and when I reconnected it went right back to empty.I checked the fuses and they seem to be Ok.I also have a 1996 F350 that I just bought with 19,483 originalmiles on it ant it also has the same problem with both tanks 460 cid in the 1996.Can sombody please help I am tired of going to get the idiots that work for me off the side of the road cause they run out of fuel. Thanks John

Please contact me at jdewees299@comcast.net

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  • jdewees299 Oct 27, 2008

    Thanks could this also be the proble with the 1996 with the 460 in it.

  • Anonymous Dec 20, 2008

    j' have Ford F 350 with gases and my two pledge does not function, when I am on the reservoire before it marks vacuum and it is full and on that in late it is empty and it marks full autremendis when I switch with l' before worms l' postponed l' master key d' switches; extreme has l' other

  • Anonymous Mar 31, 2014

    duel tanks

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I have had this problem before these trucks are famous for the fuel gauges not to work in the back of the dash panel there is a nine volt battery that runs power to it and might be dead

Posted on Oct 27, 2008

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the diesel system on your vehicle works on a continous 'loop". Tank to engine....engine to tank. The fuel filters and the water separator are very susceptible to the diesel fuel 'clouding" , making the fuel heavier to push around the system. The 'clouding' is actually a type of wax which is normally held in suspension within the body of the fuel and thus is not a problem.

The wax starts to plug up the fuel system, and cause lots of problems. The fuel, being harder to push around the system, takes more pressure to move it. This will result in diesel leaqkage at any and all outlets to atmosphere at the pressure end.

The problem is usually resolved by adding an additive to the fuel tank, or having a water separator with a heater., There are also weap-around heating cables which can be fitted to fuel lines to aleviate the same problem. If your water separator has an automatic dump valve, you might like to check that it is functioning correctly and the water content is not freezing and providing an exit for the diesel fuel.

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Just filled the gas tank in my 2006 f-350 turbo diesel super duty (6.0), started the truck and the guage showed a full tank. Drove down the road about 1/10 of a mile and the guage dropped to dead empty...


A loose connection on the sending unit could cause the problem but also moisture in the tank in cold weather could also be a factor in which i would add fuel line antifreeze to a full tank of fuel..........Hope this helps you out.

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