fuel tank capacity for 997tt

[chrismouzou]

warning light came up consider fuel range, drove for 3 more miles filled up at shell garage £40.00 and tank full to brim,checked fuel range 231 miles spoke to opc today re fuel tank, was told demo car was low on fuel and £25 put in tank took tank up to 3/4,






chris

 

[Jimberland]

Hi Chris,

Is this an observation or a question?
£40 seems good for a full tank of fuel, mine averages around £54 off the top of my head, unless the turbo tank is smaller than a C2S. No idea on that though.
Fuel range varies depending on whether or not i have been driving in town or not, 230 seems quite low to me though, but then again at £40 a tank it isn't too bad.
Be interested to see what others have to say.

Jim

 

[Rodney Naghar]

Hey Chris,

Your car has a 67l fuel tank. The problem, as with all 996/997 variants is that they have a horse-shoe shaped fuel tank.

Because of this, the car has to use 2 fuel measuring devices, one being the regular 'float' type (when the tank is around 1/4 full) and thereafter a digital device, which calculates fuel used in a real time way. From this point onwards, you should use the OBC 'Range' reading as it will be more accurate than the fuel guage.

In my experience, when the OBC says you're low on fuel, then switch to your OBC...I usually have about 18 miles left until that gets to '_ _' (ie 0) then I still have at least another 10 or so miles to go!

That's why you'll never fill up more than 40 odd litres if you do so as soon as the indicator says you're low.

This is also why you get the common problem when putting a low amount of fuel when the tank is low, and nothing registering on the meter. You have to put in at least the 1/4 odd tank full so that the float registers that fuel has been put in. [FONT=ms shell dlg"]

 

[Chris5150]

Yes indeed it is an interesting fuel tank on these cars. I remember when I first came across it, I was heading back from scotland and was registering under a qtr full, stopped at the next garage, a bp one, and only put in £20 as I like my shell garages for the plus points!.Set off from the garage and the fuel gauge doesnt move!..Im thinking has that garage just conned me? whats going on. Stopped further down at a shell garage and filled it up which only took another £25, so obviously I became aware the fuel had gone in, just the guage didnt register it. I was led to believe this is becuase it is effectively two fuel tanks and the float for the guage is in one half, so if your low and add some it does not register.
Guy took me out for a test drive in a 997 TT not so long ago and the fuel light was on, I thought hmmm this is going to be a short test drive, to which he explained he had just put £25 in and not to worry about the light...fair enough now I knew!. One of Porsche's little quirks!

 

[garyw]

Yes, 996 is the same... so luckily it was no surprise to me on this one...
Thing is that even if the car has 1/2- 3/4 of a tank and I top it up with less than £20 (not in recent times obviously[:'(]) it wouldn't register as full.

As said, one of those little quirks.. []

garyw

 

[chrismouzou]

car going to opc tue, check fuel tank petrol warning light came on checked had 20 miles showing, filled car up still only £43.00 to fill tank,am i doing something wrong




chris

 

[Rodney Naghar]

So Chris, what did the OPC say?

 

[chrismouzou]

hi rod

drove car to opc fuel tank empty, opc checked couldnt find any problems but opc filled car up £47
so car must have 20 litre reserve tank???




chris

 

[Rodney Naghar]

Hi Chris,

Its just a stupid fuel gauge. I'm in the habit of filling up when
I have a quarter tank left and noting how many litres I've
put in just in case.

Have a great Christmas mate