Inaccurate Fuel Gauge

ColinLDeans
0

Asked by ColinLDeans Jan 25, 2013 at 05:38 AM about the 2003 Volvo V40 4 Dr Turbo Wagon

Question type: General

The fuel gauge on my 2003 Volvo station wagon which has now done 104,000K keeps showing empty
well before the tank is empty, and the light comes on. While I have got used to it, what is needed to fix
this problem? Regards, Colin.L.Deans

12 Answers

DavidH25
Not Active

Probably the float sensor in the gas tank.

1 out of 1 people think this is helpful.
DavidH25
Not Active

every place I looked they all agree, the gas tank has to come out to replace the float. Personally, to me it would not be worth the expense, because you are talking 4 to 5 hundred bucks. And it seems to be a common problem on Volvo's, one of the very few problems that car develops as it ages, although any Volvo built after 2008 is not really a Volvo, the Chinese bought the nameplate from Ford, they have not been manufactured in Sweden since 2008, however your '03 is a very very well engineered car. This float thing is an anomaly you are not alone on this problem

2 out of 2 people think this is helpful.
Best Answer
tenspeed
51,825

You can try some fuel system cleaner. That might clean the variable resistor if that is the cause. It won't be any help if the resistor winding has worn through. Either way, reset the trip odo to zero when you fill up so you can estimate how much is left in the tank.

2 out of 2 people think this is helpful.
ColinLDeans
0

Thank you so much for your help. You have given me food for thought and I shall try anything out. I feel chuffed that you are telling me it is a common complaint, but that my vehicle is a good one. Thank you all. Best wishes, Colin.

Lars Cats
2,735

Drop the rear seat backrest, release the front edge of the load space carpet and remove the support panel under the carpet. You will now have to remove the access cover and the protective case on top of the combined fuel pump/sender unit, then unplug the wiring and und the fuel hoses (make sure you mark which is which). Unscrew the large plastic nut that secures the combined fuel pump/sender and pull it up (let it drain for a few seconds before taking it out all the way), Then simply replace the combined pump/sender with a new one ensuring the alignment marks match up (a small amount of petroleum jelly will aid in refitting the seal and hoses). the rest is pretty much reversal of removal. It's a bit of work to do and will cost you around 300 dollars to buy a sender unit, but that will also include a new fuel pump. As David said it's a common complaint but not a major operation to fix.

5 out of 5 people think this is helpful.
DavidH25
Not Active

I stand corrected Lars. My source(s) all seemed to agree that the tank had to come out, but your answer makes perfect sense. I saw some images and wondered..

Lars Cats
2,735

Sometimes it helps to have access to the IPB, FSM or the actual car ;-)

DavidH25
Not Active

Not sometimes....that is the most difficult part of trying to help on this forum, if every question that came in the car miraculously appeared in my driveway.....

Lars Cats
2,735

It also helps to spend a lot of time in the auto hobby club on an air base, you get to see pretty much every make and model of car pass through there.

Lars Cats
2,735

Not to mention every sort of problem...

DavidH25
Not Active

Oh yeah, I have spent plenty of time on flight lines and hangers, my knowledge of A &P, especially jet and turboprop, has carried over in to automotive applications. They are apples and oranges really, but then again some things are constants..... but I would love to get my hands on one of these again..or an F 16, the hot rod of fighters

1 out of 1 people think this is helpful.
gdt324
0

I have 2003 V40 with 71,000 on it. We bought in in 2009 and the gauge has never been accurate. I just watch the odometer. I just filled it up when it was approaching E and it only took 8.8 gallons for a 16 gallon tank. My wife does not believe me that there is better than 100 miles left in the tank. I would like to get the sender/pump replaced but only if someone knows for sure if this fixes the problem. Comments please. I think Volvo may have had a field fix for this when it was under warranty. The car has been terrific

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