When replaced the fuel send unit the fuel gage sits on empty
I replaced the fuel send unit in my f 350 with the 6.9L 1986 and the fuel gage will not work. replaced it with a ford part and still can not get it to read I am getting 6 volts to the back were the tank is and there is still notthing on the gage anyone have ideas
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Most likely it is either the fuel level sending unit attached to the fuel pump or the stand alone unit (there are two sending units, both located in the tank), or, as counter-intuitive as it seems, it could be the speedometer assembly. Personally, I lean toward the latter.
The Fuel SENDING UNIT HAS FAILED And IS CAUSING This Fluxuation Of the GAGE, The Sending Unit Is Located IN the FUEL TANK & Requires TANK REMOVAL to Replace it,
NOTE;;;; IF YOU HAVE HAD THE FUEL PUMP REPLACED RECENTLY, THEN 99% PROBABILITY THAT THE INSTALLER WAS NOT VERY GENTEL WITH IT, THIS IS A COMMON REASON FOR THIS TYPE OF FAILURE.
Gauge is not connected to any relay,its a signal from the fuel pump sending unit, you do not get voltage from that wire for the sensor you need to use a multimeter and test for ohms, every manufature is different and cant recall what it should be empty or full.
Get a shop manual or even call the local repair shop/dealer and they might give you the information you are looking for, but sounds like you have a bad sending unit and need to replace it as an Assembly.
p0463 is a self diagnostic code that is for the fuel gage sending unit located inside the fuel tank if your fuel gage is reading empty just after you filled it then that verify's the code is correct you have a bad sending unit
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.