How many litres left when the warning light comes on? - Page 5 - Motorhome Forums, Motorhome Discussion, Motorhome Chat

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post #41 of 45 (permalink) Old 12-02-2012, 12:06
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There can be one problem with trying to assess the amount left when the warning lights; by filling up and deducting the fill amount from the tank capacity to arrive at the 'reserve' figure.

If the forecourt is not level when filling the fill can be less than to 'full tank'.

E.g 100lt tank

There is 10lt remaining before fill.

Fill on flat would be 90lt

Fill on slope might be only 85 lt (or less)

Leading one to believe 100-85 = 15lt remaining, when in reality it is 10lt

Geoff
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post #42 of 45 (permalink) Old 12-02-2012, 13:03
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this reminds me of the old vauxhall carlton I'd been given by my company - while on holiday in the South of France it developed a fuel sensor fault - on the return journey I remember stopping with monotonous regularity to ensure the tank stayed full never knowing the distance to the next filling station.
I must admit that nowadays I prefer to fill up at supermarkets and consequently do sometimes run into the red!
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post #43 of 45 (permalink) Old 12-02-2012, 21:00
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Quote:
Originally Posted by nicholsong
There can be one problem with trying to assess the amount left when the warning lights; by filling up and deducting the fill amount from the tank capacity to arrive at the 'reserve' figure.

If the forecourt is not level when filling the fill can be less than to 'full tank'.

E.g 100lt tank

There is 10lt remaining before fill.

Fill on flat would be 90lt

Fill on slope might be only 85 lt (or less)

Leading one to believe 100-85 = 15lt remaining, when in reality it is 10lt

Geoff
Not always the case. I had a Saab 900 with a computer that would do "distance til empty" and a warning light. The warning was based on a commutation of the consumption in the last 5 miles and amount of fuel left.

The last few miles to our house involves a number of 3 in 1 climbs (second gear stuff) on narrow roads. We could get home with the light on. Next day on crusing down the hills it would go off.
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post #44 of 45 (permalink) Old 13-02-2012, 09:06
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Quote:
Originally Posted by Glandwr
Quote:
Originally Posted by nicholsong
There can be one problem with trying to assess the amount left when the warning lights; by filling up and deducting the fill amount from the tank capacity to arrive at the 'reserve' figure.

If the forecourt is not level when filling the fill can be less than to 'full tank'.

E.g 100lt tank

There is 10lt remaining before fill.

Fill on flat would be 90lt

Fill on slope might be only 85 lt (or less)

Leading one to believe 100-85 = 15lt remaining, when in reality it is 10lt

Geoff
Not always the case. I had a Saab 900 with a computer that would do "distance til empty" and a warning light. The warning was based on a commutation of the consumption in the last 5 miles and amount of fuel left.

The last few miles to our house involves a number of 3 in 1 climbs (second gear stuff) on narrow roads. We could get home with the light on. Next day on crusing down the hills it would go off.

I was assuming the other posters using the top-up to calculate the fuel remaining were referring to a float-switch operated warning light.

Is the Saab one operated by the computer calculating miles to go, i.e. it would always come on at same mileage, based on recent fuel-flow, or could it be that the light is operated by a float switch? Just asking.

Geoff
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post #45 of 45 (permalink) Old 14-02-2012, 09:46
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Quote:
Originally Posted by nicholsong
Quote:
Originally Posted by Glandwr
Quote:
Originally Posted by nicholsong
There can be one problem with trying to assess the amount left when the warning lights; by filling up and deducting the fill amount from the tank capacity to arrive at the 'reserve' figure.

If the forecourt is not level when filling the fill can be less than to 'full tank'.

E.g 100lt tank

There is 10lt remaining before fill.

Fill on flat would be 90lt

Fill on slope might be only 85 lt (or less)

Leading one to believe 100-85 = 15lt remaining, when in reality it is 10lt

Geoff
Not always the case. I had a Saab 900 with a computer that would do "distance til empty" and a warning light. The warning was based on a commutation of the consumption in the last 5 miles and amount of fuel left.

The last few miles to our house involves a number of 3 in 1 climbs (second gear stuff) on narrow roads. We could get home with the light on. Next day on crusing down the hills it would go off.

I was assuming the other posters using the top-up to calculate the fuel remaining were referring to a float-switch operated warning light.

Is the Saab one operated by the computer calculating miles to go, i.e. it would always come on at same mileage, based on recent fuel-flow, or could it be that the light is operated by a float switch? Just asking.

Geoff
It seemed to be calculating it Geoff. But must take the reading from a float. Can't be more precise, sorry.

Dick
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