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
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No issues with the fuel guage that I know of , but you can follow the basic troubleshooting guidelines. Starting with the wiring disconnect at the fuel tank for a bad connector or bad connection. Only other connection would be up to the instrument cluster in the vehicle. Only replaceable items would be the guage or the sending unit in the fuel tank. You can disconnect the return line circuit or connector at the at the gas tank and jump a wire to the ground the that feeds the gauge and see if the guage moves, but don't and i repeat don't hold to long because the guage will go over hard over and could damage the guage. If the guage moved and I would suspect a bad float on the sending unit or a bad sending unit, either case the fuel pump assy would have to come out for repairs.
crack open an injector line and look for fuel at that point if no fuel there, take off oil filtertype fuel filter and look to see if it has fuel in it..we had a ford f650 superduty that a driver ran empty and were forever bleeding att hthe air out of the system to restart it..on diesels the system can have no air in the lines anywhere..so if the filter is empty, fill it before installing it...saves on the starter getting hot...in extreme cases you can pump pressure into the tank up to 20 psi and force fuel up front be careful on plastic tanks though...good luck and repost please...
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.
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.
drop fuel tank. if guage moves all around its probably the fuel level sensor on fuel pump assembly in the fuel tank. If the guage stay's in one spot its the guage , replace instrument cluster assembly. you can take just the glass off the cluster and move the fuel guage needle and it will work (if stuck) but for how long? The wires to the guage come from the sending unit to the power train control module to the instrument cluster. pray its not in the wiring.