vacuum issue.. help!
Join Date: Feb 2006
Location: United Kingdom
Re: Fuel gauge problem 156
Had EXACTLY the same problem.
The reason mine did it, was the fuel filler cap wasn't on properly, Filled up at the Petrol Station, usual 50+ Litres and the gauge tock ages and ages (like 20 mins) to go to half way.
I checked the filler cap, and refitted it, went straight back up to full (in a few mins).
I'm not sure on the fuel level system, most cars have a float in the tank, maybe the my 147 JTD has a volumetric system, creating back pressure in the tank to measure how full it is.
I'm sure someone out there will know how it works.
Hope this is your problem, make sure the click a couple or three times clockwise, before locking it clockwise.