Question about 1984 Ford F 150

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1984 Ford F150 Fuel gauge reads empty

Fuel gauge always reads empty. Haven't checked anything yet, what are some ways I can test the fuel sending unit and gauge itself? I know removing the dash cover is one way to check the gauge.

Posted by dillon_couch on

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Johnny Brown

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  • Ford Master
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I would bet the sending unit is bad but lets check it, a good test i use is that i have a used sending unit i connect to wiring to test the gauge and wiring, if the gauge moves when i move the testing unit then i know the gauge is good and the wiring to, locte the connector at fuel tank, and unplug it, this will be the one the leads to top of the tank and the connector will be on the side be the frame on drivers side, the way you know you have the right connector will be the truck will not run as this connector has the sending unit and pump wires in it, if the gauge goes to full then you know the wiring is good and the gauge is good, you can jump the two wires and gauge should go to full also. the problem is you must get the right wires for sending unit or you may pop fuse, let me see if i can get you a wiring diagram or just do the full test by unplugging connector.

Okay, your sending unit has a yellow and white wire, thats the sending unit wire, the other is a ground and we wont worry about that. so if you want to see if gauge will go to empty or full just unplug connector and gauge will move to full then if you take a wire and jump the yellow wire with white stripe to a good ground the gauge will go to empty, the thing is your gauge is on empty so sending unit may be grounded out, good day1984 Ford F150 Fuel gauge reads empty - 10_21_2012_4_15_34_pm.gif

Posted on Oct 21, 2012

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5 Related Answers

Anonymous

  • 1 Answer

SOURCE: 1966 Ford Mustang Gas Guage not working

I had a similar problem. In my 1966 Mustang gas tank, the fuel pick-up was on a "float." My float developed a hole, filled with gasoline, and sank to the bottom of the tank, therefore, the gauge always read empty, but the car ran well. All the other gauges of course worked correctly. The repair was a relatively simple soldering job (after removing the float from the tank), but if that is indeed the problem, ensure all the gasoline is drained from the float before beginning the soldering job.

Posted on Dec 05, 2008

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rblack_51

  • 3 Answers

SOURCE: fuel guage quit

the sender unit in the fuel tank has given up the ghost ,replace unit

Posted on Dec 02, 2008

mpservices

  • 191 Answers

SOURCE: Fuel Gauge not working

The switch that you use to change tanks is probably faulty - the switch supplies power for the sending unit in the tank, and to the transfer switch for the gas lines - use a meter to check it

Posted on Nov 27, 2008

jamie

  • 1810 Answers

SOURCE: 1993 F150 front tank gauge reads empty, sending unit bad maybe?

chilton ar harnes make a great bible for cases like theise chapters indago sell em cheep

Posted on Jan 03, 2010

Anonymous

  • 295 Answers

SOURCE: 1985 ford bronco 2 fuel gauge does not work.

I would change the fuel gages if not part of teh complete instrument cluster.

Posted on Mar 18, 2009

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My fuel gauge read empty even with a full tank of gas


Probable causes:

  1. Wire from dash gauge to sending unit is broken or the connection is corroded hindering electrical connection.
  2. Resistance wire inside sending unit is broken
  3. Lack of proper grounding between sending unit and tank or between tank and chassis
Narrow the cause by testing. At the bottom on the following webpage you will find testing procedures as well as repair. (It is always helpful to mention brand and model and year).
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Most likely just a faulty ground connection. When something electrical goes wrong, always check the ground FIRST. You already know the gauge itself is working, because it will move on it's own. It has to be grounded well in order for the sending unit in the tank to show proper reading. If all grounds are good, it would be a faulty sending unit in the tank. Best to check ALL connections.

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Courtney, Check the fuse first for the gage, if blown, replace. The gas tank will probably have to be taken out of vehicle to change the fuel sending unit. 1st Link shows how to test, other links will show replacement procedures.
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The most common way to find out is to test both components.
The sending unit in most vehicles grounds the gauge on the dash.
You would unplug the sending unit - pump harness at the tank and ground the sending unit wire. If the gauge climbs up to full the sending unit is at fault.
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You need to check voltage at the gauge on the dash.
They would stop at random places with the key off.
You can disconnect the sending unit in the tank and ground the gauge to test.
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Got the same problem, when empty fuel gauge shows full but fuel indicator light lights on.
Problem was the gauge itself and replaced by a second hand one.
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I have a 94 chevy s10 and my gas reads empty while i drive.but when i shut off the truck the gauge moves to different readings.


Is......the problem--"the gas gage reads empty when there is fuel in the tank. OR, The gage moves when the key to turned off ?

If it's the first,
You will need to test the gage and through process of elimination, determin if the Sending unit inside the fuel tank has gone Bad.

If its the second ? - Electrical gauges will move when powered down. Normal

Testing the gauge may not be easy - just depends on your ability.
It is a simple 2-wire gauge circuit, when disconnect (usually need the fuel tank) the gage reads in one direction (either full or empty)
then when shorted-the gage reads in oppisite direction.

Of course you must select the correct wires or you may short out the wrong circuits!! Most GM vehicles use a purple wire & black wire.

A quick method I have used to check the in-take part of the gauge is this.
1st. know there is gas - 1/2 tank works best.
2nd driver's door open, key in run position, engine not running.
3rd gently lift up on the door then let if come back down, gently.
just enough to cause the gas to slosh around.
4th - keep an eye on the gas gage, a bad sending unit in the take will show up as a "twitchy" needle.

Of course, if the gage never leaves empty - sloshing won't work.
I have a known good sending unit I can plug into the vehicle and simulate different levels of fuel - if the gas gage works, I know the problem is in the tank.

Let us know.

Dave

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Buick with a 5.0?? OK, regardless, pressure should not drop like that. Possible that fuel filter is full of **** & should be changed, or, you may indeed have a bad pump... (can happen). Sending unit: sounds like you have the leads reversed or the unit is somehow different than the one you replaced.

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You don;t say whether the fuel gauge is reading accurately, or whether it's always on empty. If the gauge is always showing empty, it's most likely a problem with the sending unit in the fuel tank. Check the resistance across the two terminals of the sending unit.

On a C900, the fuel sender level unit is separate from the fuel pump and located on the right side top of the tank, accessible by removing the trunk floor lift up panel (the pump is located on the left side top of the tank.
Possible problems are: electrical line off or broken, float not working (it's fairly delicate); or gauge not working.

Test the resistance of the sending unit with the lines disconnected, the resistance should be 2.6 to 3.8 ohms full tank, 63.3 to 67.5 ohms empty tank; and test for voltage across the top of the sender unit, if no voltage, that's likely the problem!

If the gauge is otherwise reading accurately (showing 'full' for a full tank, etc) then the problem is likely a gauge malfunction and can be simply replaced.

Good luck!

Saabreur

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