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Hey guys, I really need y'all's help on this. Ever since January My fuel gauge has been acting up big time. I can have any amount of gas in my tank at any given time and the fuel gauge will fall to empty resulting in the fuel and check engine light coming on. The gauge will then return to its position (it still doesn't read correctly) and the check engine light will stay on. I took it to the ford dealer and they said to replace the entire fuel sending unit assembly and quoted me $1,500 for parts and labor so I went to Amazon and bought the oem motorcraft fuel sending unit assembly for $308 and did it myself. The only problem is, I still have the issue. I'm currently checking fuses and relays, PLEASE HELP. By the way, my truck is a 2004 f250 fx4 5.4
Do you have the "Torque Pro" app and a ELM 327 OBD adapter?
If so, when the gauge is incorrect, look for the PID for "Fuel Level". It reads as a percentage. If it doesn't match your cluster, you have a bad stepper motor or a different electrical problem in the cluster.
I have this problem currently in my 2005 F350 6.0L, but the ECM always shows the correct fuel level. For example, my fuel gauge will read half a tank ON THE OTHER SIDE OF THE GAUGE sometimes. On the Torque app, I can see that I have 78% in the fuel tank.
Sometimes, my gauge will read below empty after a fill up, and the torque app will show "99.8%" Fuel Level.