fuel guage unreliable
Discussion
TVR fuel gauges are notorious for this. When mine reads between empty and full, it means the tank is somewhere between empty and full. If you read any more into it than that, you'll be needing a jerry can and a companion for the long walk.
Seriously, the gauges are probably calibrated linearly, and the sender float describes a big arc in the tank as the fuel level drops, i.e. it the relationship between fuel level in the tank and sender voltage is NOT linear.
It could be mucky connection somewhere though, so worth checking, as the gauge and sender will be connected in series between ground and ignition live.
Seriously, the gauges are probably calibrated linearly, and the sender float describes a big arc in the tank as the fuel level drops, i.e. it the relationship between fuel level in the tank and sender voltage is NOT linear.
It could be mucky connection somewhere though, so worth checking, as the gauge and sender will be connected in series between ground and ignition live.
This was the email reply from technical support when I asked about the one's fitted to an early 350i.
TVR were notorious for using a variety of suppliers. If the BF2242 is
exactly the same (apart from the bezel finish) as the original fitted to the
vehicle, then the chances are very high that the gauge will match the
sender.
To make absolutely sure, if you are able, you can check the resistance
values of the sender. The sender should have resistance values as follows.
Full - 240 ohms
Half - 67 ohms
Empty - 20 ohms
These are the nominal sender values. These values match those of the BF2242
gauge.
If there is any further information required please do not hesitate to
contact the undersigned.
Regards
Neil Meakin
Caerbont Automotive Instruments Ltd
TVR were notorious for using a variety of suppliers. If the BF2242 is
exactly the same (apart from the bezel finish) as the original fitted to the
vehicle, then the chances are very high that the gauge will match the
sender.
To make absolutely sure, if you are able, you can check the resistance
values of the sender. The sender should have resistance values as follows.
Full - 240 ohms
Half - 67 ohms
Empty - 20 ohms
These are the nominal sender values. These values match those of the BF2242
gauge.
If there is any further information required please do not hesitate to
contact the undersigned.
Regards
Neil Meakin
Caerbont Automotive Instruments Ltd
grahamw48 said:
Luxury !
My old....blah blah blah
"You were lucky. We lived for three months in a paper bag in a septic tank. We used to have to get up at six in the morning, clean the paper bag, eat a crust of stale bread, go to work down t' mill, fourteen hours a day, week-in week-out, for sixpence a week, and when we got home our Dad would thrash us to sleep wi' his belt."My old....blah blah blah
mightymouse said:
grahamw48 said:
Luxury !
My old Lotus 7 just had a dip stick !
What did your Dutton have ??My old Lotus 7 just had a dip stick !
Can't believe you owned up to having one
It was a 'B Plus' with a 1600GT crossflow.
-Started off with a hood, but that flew off and disappeared over a hedge, never to be seen again.
Amongst many other acts of self-destruction, the cooling fan simply fell clanging to the floor one day as I was trying to look cool, while looking for a space in a busy car park.
Chassis broke as I was showing off by spinning the wheels opposite the queue for the local nightclub.
The exhaust manis had more gungum than metal, and I once managed to overheat it so much that the core plugs popped and engine oil and water were vaporised.
Cost ? ...2 new coreplugs for about 20p. That's luck. 
Yep...great car for masochistic Mr. Fixits with no shame.
dwgriffith said:
This was the email reply from technical support when I asked about the one's fitted to an early 350i.
TVR were notorious for using a variety of suppliers. If the BF2242 is
exactly the same (apart from the bezel finish) as the original fitted to the
vehicle, then the chances are very high that the gauge will match the
sender.
To make absolutely sure, if you are able, you can check the resistance
values of the sender. The sender should have resistance values as follows.
Full - 240 ohms
Half - 67 ohms
Empty - 20 ohms
These are the nominal sender values. These values match those of the BF2242
gauge.
If there is any further information required please do not hesitate to
contact the undersigned.
Regards
Neil Meakin
Caerbont Automotive Instruments Ltd
I've not know anyone be able to buy or find the sourceTVR were notorious for using a variety of suppliers. If the BF2242 is
exactly the same (apart from the bezel finish) as the original fitted to the
vehicle, then the chances are very high that the gauge will match the
sender.
To make absolutely sure, if you are able, you can check the resistance
values of the sender. The sender should have resistance values as follows.
Full - 240 ohms
Half - 67 ohms
Empty - 20 ohms
These are the nominal sender values. These values match those of the BF2242
gauge.
If there is any further information required please do not hesitate to
contact the undersigned.
Regards
Neil Meakin
Caerbont Automotive Instruments Ltd
on the sender unit .. is it possible that Caerbont might have made the sender or cound make more ?
I've not know anyone be able to buy or find the source
on the sender unit .. is it possible that Caerbont might have made the sender or cound make more ?
[/quote]
I never asked them at the time. I picked up some new boxed fuel gauges a couple of years ago and was simply trying to find out if they were compatible with the wedge I had at the time. Now that I have remembered I still have them they will go on eBay as they don't fit a griff.
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