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OnOneSteve
Newbie


Joined: 10 Dec 2013
Posts: 13
Location: Barnsley


PostPosted: Wed Dec 11, 2013 3:55 pm    Post subject: Fuel gauge!!!!! Reply with quote

I don't seem to be having much fun since becoming a 911 owner Mad

I've just been and put some fuel in my 996 C4 and the fuel gauge hasn't moved!!
Can they take some time to catch up or do I have a problem?

I had a Boxster previous to this and didn't have an ounce of trouble in 18 months
 
  
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scottuk
Hockenheim


Joined: 06 Sep 2012
Posts: 738
Location: Broughty Ferry

2003 Porsche 996 Carrera 4S

PostPosted: Wed Dec 11, 2013 3:59 pm    Post subject: Reply with quote

Hi,
You don't have a problem, you have a Carrera 4!
The front diff' required a redesign of the fuel tank, also front mounted, to keep it simple, think of your tank as two saddles, if you only put in a small amount of fuel from empty, it will never move the gauge.

ScottUK
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OnOneSteve
Newbie


Joined: 10 Dec 2013
Posts: 13
Location: Barnsley


PostPosted: Wed Dec 11, 2013 4:02 pm    Post subject: Reply with quote

Phew thanks for that. I did only put £20 in and it was almost empy!!!
Guess I'll not have to be such a tight arse next time.
 
  
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OnOneSteve
Newbie


Joined: 10 Dec 2013
Posts: 13
Location: Barnsley


PostPosted: Wed Dec 11, 2013 4:04 pm    Post subject: Reply with quote

Empty even!!!!
 
  
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ragpicker
Reims


Joined: 14 Apr 2013
Posts: 4029
Location: North East England


PostPosted: Wed Dec 11, 2013 4:12 pm    Post subject: Reply with quote

Haha, i used to find this with my 4S.

Trouble is you never know how much fuel you have in unless you always fill it up...

Having said that I did find that if I drove for more than 30 mins or so the fuel guage sometimes figured it out! Question

One of the little things that give the Porkers so much character I spose!
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GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire


PostPosted: Wed Dec 11, 2013 4:40 pm    Post subject: Reply with quote

It won't register (on AWD chassis cars) until you fill it with at least 19L

You have an AWD chassis, so you have a split fuel tank (ie "separate" sections, rather than leaking!)

The AWD models (so C4, Turbo etc) have additional driveshafts to and at the front (obviously), but this poses problems for the original position/size of the fuel tank.

So AWD models have a reshaped tank, to straddle the driveline and new chassis strengthening structures and driveshaft mountings etc.

The fuel gauge technically only operates above the "flat" of the tank, any fuel level below this is "guessed" by a fuel tank algorithm and sent to the electronic analogue display on the dash.

This means if you are empty and add only enough to fill the lower section of the tank, the sensor is still dry and the gauge won't move (ie under-reads fuel volume)

This might sound stupid, but it is preferable to having the sensor in the base of the tank and over-reading and hence you thinking you have more fuel.

Once enough fuel is added to fill the lower section (ie up to the "flat") the sensor is "wet" and the gauge reads as normal (ie a measure of the entire tank).

This "flat" volume is usually about 1/4 tank (below 19 litres the system actually guesses your remaining fuel from fuelling data, only once it is refilled above this level again is the alogorithm reset and continuous reading handed back to the sensor).

Note: in the diagrams below the "2WD" and "AWD" refer to chassis type, this means as GT3/G2T models use AWD chassis and hence use AWD tanks.

 
  
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Disco
Estoril


Joined: 13 May 2008
Posts: 3965
Location: Hertfordshire

2010 Porsche 997 GT3

PostPosted: Wed Dec 11, 2013 5:07 pm    Post subject: Reply with quote

As a footnote to this, when I had a 996 GT3 (which while a 2WD car actually uses a 996 C4 shell for rigidity, hence has the same tank) I had a couple of instances where it failed to register fuel. Both when running it low on track and it then brimming it but no indication that any fuel had been added. In both cases a couple of laps of the Nordschleife later it was fine.
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OnOneSteve
Newbie


Joined: 10 Dec 2013
Posts: 13
Location: Barnsley


PostPosted: Wed Dec 11, 2013 5:13 pm    Post subject: Reply with quote

Yeah thanks for that guys.
Guess I'll put at least £40 at every visit now. It all make perfect sense for the tank being modified to accommodate the front diff. worship
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GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire


PostPosted: Wed Dec 11, 2013 7:15 pm    Post subject: Reply with quote

Disco wrote:
As a footnote to this, when I had a 996 GT3 (which while a 2WD car actually uses a 996 C4 shell for rigidity, hence has the same tank) I had a couple of instances where it failed to register fuel. Both when running it low on track and it then brimming it but no indication that any fuel had been added. In both cases a couple of laps of the Nordschleife later it was fine.


GT models mentioned above (although apologies for "G2T" typo)

The problem with dropping the fuel level to really empty and refilling is independent of the algorithm issue.

If the fuel drops below the bottom of the gauge capillary, you get airlocks (and measurement).

Fortunately, overnight park-up or continued use will clear it.
 
  
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LIZ111S
Montreal


Joined: 29 Mar 2011
Posts: 566
Location: Herefordshire

2003 Porsche 996 Carrera 4

PostPosted: Wed Dec 11, 2013 7:24 pm    Post subject: Reply with quote

A characteristic of the 4 Grin
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monty
Montreal


Joined: 19 Nov 2010
Posts: 557



PostPosted: Wed Dec 11, 2013 8:19 pm    Post subject: Reply with quote

Gt4 please tell me you cut and paste that explanation not retype it every time it gets asked Surprised

One for the FAQS maybe?
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GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire


PostPosted: Thu Dec 12, 2013 10:00 am    Post subject: Reply with quote

Of course I cut a paste it.

I have no shame in that, given I wrote it.

I don't draw the explanatory diagram in MS Paint again either!


I do sometimes modify it depending on the vanilla of the question.

(I really do need to correct the "G2T", but I only just noticed it this time - Embarassed).


Sometimes putting things in FAQs is the best way for them not to be read!

There is always the search button, and posting so many times at least gives someone a fighting chance of finding it.

Cutting and pasting means it is no more effort than posting any FAQs link anyway.
 
  
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ScoobyDoo555
Barcelona


Joined: 26 Feb 2012
Posts: 1295



PostPosted: Fri Dec 13, 2013 3:00 pm    Post subject: Reply with quote

LOL Very Happy A belated "welcome" Thumb

Another C4 owner thinking, "is there a feckin hole in my fuel tank?" Very Happy

I sh@t myself first time it happened Very Happy

Not something they put in the manual Very Happy

Dan Smile
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Mods: "new car" magic tree. Pioneer F900bt, Alpine SPG10C2 x 4, JBL GTO 804 8" subs x 2, Shiny new rads & AC! Hartech-rebuilt engine & Sports exhaust
997 C2s discs. She stops quite nicely!
 
  
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mcbit
Nürburgring


Joined: 15 Oct 2013
Posts: 445
Location: Abu Dhabi, UAE


PostPosted: Mon Dec 16, 2013 3:03 pm    Post subject: Reply with quote

ScoobyDoo555 wrote:


Not something they put in the manual Very Happy


Dont know
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2009 Cayenne turbo (PDCC)
 



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ScoobyDoo555
Barcelona


Joined: 26 Feb 2012
Posts: 1295



PostPosted: Mon Dec 16, 2013 5:32 pm    Post subject: Reply with quote

I stand corrected - must have missed that bit. But good to point out.

That said, being in the UAE, surely fuel is not exactly an issue - just fill it up at a stupidly cheap price! Very Happy <jealous>
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Porsche 996 Carrera 4
Mods: "new car" magic tree. Pioneer F900bt, Alpine SPG10C2 x 4, JBL GTO 804 8" subs x 2, Shiny new rads & AC! Hartech-rebuilt engine & Sports exhaust
997 C2s discs. She stops quite nicely!
 
  
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mcbit
Nürburgring


Joined: 15 Oct 2013
Posts: 445
Location: Abu Dhabi, UAE


PostPosted: Tue Dec 17, 2013 3:06 am    Post subject: Reply with quote

ScoobyDoo555 wrote:
I stand corrected - must have missed that bit. But good to point out.

That said, being in the UAE, surely fuel is not exactly an issue - just fill it up at a stupidly cheap price! Very Happy <jealous>


31p /litre, can fill up the CTT and 4S from empty for fifty quid

.....just so you feel better thumbsup
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2009 Cayenne turbo (PDCC)
 
  
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ScoobyDoo555
Barcelona


Joined: 26 Feb 2012
Posts: 1295



PostPosted: Tue Dec 17, 2013 8:04 am    Post subject: Reply with quote

Very Happy

So the section in the manual is completely irrelevant to you Very Happy
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Porsche 996 Carrera 4
Mods: "new car" magic tree. Pioneer F900bt, Alpine SPG10C2 x 4, JBL GTO 804 8" subs x 2, Shiny new rads & AC! Hartech-rebuilt engine & Sports exhaust
997 C2s discs. She stops quite nicely!
 
  
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mcbit
Nürburgring


Joined: 15 Oct 2013
Posts: 445
Location: Abu Dhabi, UAE


PostPosted: Tue Dec 17, 2013 3:40 pm    Post subject: Reply with quote

ScoobyDoo555 wrote:
Very Happy

So the section in the manual is completely irrelevant to you Very Happy


I had to find out where to put it. Question
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