Strange fuel/gauge problem - any ideas?

Gary Jones · 14 Jul 2007

electech said:
The float should NOT jam if you let the car run low on fuel, however the float does not actualy touch the fuel much below 1/4 tank. If you let it run low and only add ten pounds or so the fuel still wont reach the float and hey presto the car does not know the fuel has been added. The car systems calculate the fuel use electronicaly at less than 1/4 tank thus the gauge still appears to work going down.

Cheers - that makes some sense....I noticed that even though it was registering as "empty" and zero range, I was still getting mpg calculations so that seems to tie in too 8)

wdonovan · 17 Jul 2007

You'll still get MPG calculations because Porsche estimates the fuel level below a certain fuel level, basing the estimate on average MPG before that point. They do not trust the actual float when level is low so they do it that way. Float will not activate again until a certain threshold is reached. It's all in the service manual. Because of the difference in the tank shape, the C4 has this issue even more than the C2.

David M · 18 Jul 2007

Woops....I just accused a BP garage for ripping me off when I added £20 of fuel to an almost empty tank

.....now I know why the needle did not move.

Gary Jones · 18 Jul 2007

David M said:
Woops....I just accused a BP garage for ripping me off when I added £20 of fuel to an almost empty tank .....now I know why the needle did not move.

I was only slightly more diplomatic when it happened to me :wink: Luckily the natives in mid-Wales were very friendly

...and just used my confusion as an excuse to ask questions/have a nose about the car

8)

Strange fuel/gauge problem - any ideas?

Gary Jones

Montreal

wdonovan

New member

David M

Spa-Francorchamps

Gary Jones

Montreal

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