Fuel gauge erroneous

[thx1138v2]

I had my ECM replaced and ever since then the fuel gauge reads incorrectly. It throws a P0463 code, "Fuel level sensor A circuit high".

 

I filled the tank to make sure it would read something but the needle stays on "E" and the LED stays lit all the time. The shop that put the new unit in said they had it reprogrammed. Is there anything I need to do re-calibrate the sender in the fuel pump and the gauge in the cab?

 

 

 

[CamGTP]

Nope, nothing requires a reprogram for the fuel system.

 

It should be the shops problem if a new PCM is causing the fuel gauge to read incorrectly all the time. Though it could be possible the fuel level sendor just randomly died at the same exact time.

[thx1138v2]

Is the "fuel level sendor" the same thing as the float that is attached to an arm inside the tank?

[CamGTP]

Yes.

[richard wysong]

the arm is attached to the fuel level sensor. Serviced by replacing the fuel pump module,  Usually easier to unbolt the bed and block it up to work on it than dropping the tank. Don't skimp on the part, too much labor to do twice

[thx1138v2]

16 hours ago, CamGTP said:

Yes.

The reason I ask is that this fuel tank has two things that go through the top of the tank - the fuel pump assembly with the float and something goes through the top of the tank near the rear. Do you know what that 2nd device is?

[thx1138v2]

16 hours ago, richard wysong said:

the arm is attached to the fuel level sensor. Serviced by replacing the fuel pump module,  Usually easier to unbolt the bed and block it up to work on it than dropping the tank. Don't skimp on the part, too much labor to do twice

Good advice. Thanks. I've been trying to tilt the bed over to the passenger side to get to the pump on the driver's side. That is quite a bear. I'm taking a break right now and might look at it again when I get back to it.

 

Thanks again.

[CamGTP]

Likely the EVAP stuff at the other end of the tank. The pump and fuel level sendor are together,

[thx1138v2]

Are there any known "Tips and Tricks" to getting the lines that attach to the top of the fuel pump back onto their appropriate nipples? I've got 2 back on but the largest one just won't go on. All of the videos I've viewed make it look easy peasy but I just can't get the large one back onto its nipple on the fuel pump.

 

 I've tried WD-40 on the nipple and inside the fitting but I just can't get it go on. I've been squeezing the outside front of the fitting and wiggling it back and forth and pulling on it but it has defeated me.

 

Could someone please explain to me what each of the 3 lines on the top of the fuel pump are used for.

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Never mind. On closer inspection the fitting was completely on and secure. My bad.

 

The 3 lines are the fuel to the engine (closest to the cab) and the other 2 are evap lines.

Edited November 10, 2024 by thx1138v2