Petrol gauge not working properly

SIPHIWE MAFOKATE

MEMBER
2008 FORD FOCUS
2.0L
MANUAL
107,330 MILES

Hello

I have the car listed above which I recently bought. I am experiencing a problem whereby my petrol gauge is malfunctioning. When I pour a full tank, the gauge will go up until above half but won't reach full tank and the petrol ends up overflowing.

So I ended up asking some questions, then some people were suspecting that it maybe the "tank fuel pump" and others were suspecting the wiring of the car.

So I ended up taking my car to a diagnosis on Friday. On the diagnosis it didn't say much about the tank fuel pump. The report came starting that the code of "U2023-vehicle communication network fault".

So I wanted to inquire about this matter to you.

2 Replies

DANNY L

MECHANIC
5,648 POSTS

Hello, I'm Danny.

Your in tank electric fuel pump also includes a float to determine the fuel level in the tank.The float is used in conjunction with a circuit board acting as a potentiometer to be used to determine the fuel level. If the potentiometer has fallen out of calibration or is faulty it will show an incorrect level.That means the fuel pump assembly will need to be replaced to correct the problem. Here is a tutorial showing what's involved:

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

I've attached a picture of the fuel pump and circled the float in red. I've also attached photos of what need to be checked for your code. Hope this helps and thanks for using 2CarPros.

Danny-

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Monday, July 8th, 2019 AT 10:41 PM

BMDOUBLE

MECHANIC
1,139 POSTS

These fuel pumps have a tendency to become dislodged because of the way they are mounted inside of the tank, which will give you an incorrect fuel level reading because the entire pump is floating inside the tank instead of anchored to the bottom of the tank like it’s supposed to be. Wait until your tank is nearly empty from daily use then unbolt the front of the tank while the car is safely raised on a lift or jack stands and lower the front of the tank to access the pump for removal. You’ll need to take this pump out for inspection is the best way to verify what is going on here.

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Tuesday, July 9th, 2019 AT 1:53 PM