Nuno,

If you use a peristaltic pump to feed the carburettor/ injection float
then the pump revolutions will be very closely related to the fuel
usage. Normally silicon is used, however if pumping petrol then a rubber
hose would be required.   OBTW peristaltic pump has tube aranged to be
held in a part circle around shaft with ballbearings etc rotating to
squeeze fluid along tube by pressing tube against(part circular)
housing.

regards, Graham DanielNuno Pedrosa wrote:
>
> Hello All!
>   Instead of asking about small parts of my problem, I'll explain what I
> intend to do with fuel measurement. Maybe this helps people help me
> better! 8)
>
>   So:
>   I have a Toyota LandCruiser, 18 years of age. Cheap car, but great for
> 4x4 fun-races. There's a lot of those races in Portugal, and, since
> they are for fun, but still they are races, a lot of people buys old
> 4x4s and adapt them. Add a few extra bumpers, cut weight where it ain't
> needed, add really mean tires, etc... There are people with new 4x4s. I
> pity them, though... My old 4x4, with it's simple transmission, no
> blocking, gets first with no problem. I've rolled it to the side, once.
> So what? It's old anyway. Driving on the road is a pain, of course, but
> that's not its purpose.
>
>   What we really need in this races, is the distance measuring, with
> 10 meters accuracy. But, since the PIC would be quite bored just doing
> that, I want to had some extra features, like fuel consuption. I was
> thinking of three sensors: Fuel, RPM, and distance. With this, I can
> calculate: Kms remaining in tank, average speed, time to get there,
> recommended gear, etc, etc... Just pick the variables and juggle them.
>
>   So, as you can see, I have to think of cars which have no electronics,
> not only my car, but maybe other similar, old, ones.
>
>   Thanx for your help,
>   Nuno Pedrosa
>
> --
>
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