MK4 GTI Dodgy Petrol Gauge

[Rannerz]

The petrol gauge is acting up.
Monday evening I filled the tank up with 98 Octane. After driving the car numerous times the petrol gauge is stuck on full.
When i got the car i filled it to the brim and never had this problem, this is the second time I've filled it to the brim and now the gauge doesn't like me.
When I turn the car off it goes to the bottom, so that works fine.
Today i was driving and was stuck on a hill with traffic and the gauge went to below the top line, as i drove off on level ground it went back up to full.
I even boosted a fair bit to see if the gauge would move but nothing.
Hitting the dash did nothing.

Has this happened to anyone else?
Or how could this be fixed? As i would like to know how much petrol is in my car.

Thanks

[thepowercosmic]

Sounds like the fuel sender unit is busted.

You'll have to remove your rear seats to get to it.

I believe that the fuel sender unit is separate from the fuel pump and if I'm correct you'll be able to just replace the FSU.

DIY here: VWVortex.com - DIY: Removal and Reinstallation of Fuel Sending Unit

[GTIMK4]

Hey Mate,

you should try the following:

1 Disconnect the postive and negative cables on the battery
2 Bridge the cables for ten seconds
3 reconnect the cables on the battery

Doing this will reset your instrument cluster, sometimes this is enough to do the trick.
Hope this helps,
Cheers Richard.

[Rannerz]

The gauge slightly works now. It moved down a little bit, but it should be lower. Ill have a look and get a new one i suppose.
Thanks

[JustCruisn]

How many Km have you traveled since filling up ? I get about 80km before mine moves.

[Cookie28]

How many Km have you traveled since filling up ? I get about 80km before mine moves.

I can get up to about 130kms before mine moves at all depending on how I drive haha, to the OP just give it a little bit of time and just see if it drops

[Rannerz]

haven't really checked how many kms. Ill have a suss tomorrow how many i do, and hopefully the gauge budges more