fuel flow meter

Has anyone ever heard about putting a flowmeter into the fuel line somewhere to monitor fuel consumption?

I am having some problems with my bus, and I reckon they're fuel related. A flow meter would help diagnose the problem.

Also, this could be used to calculate efficiency (as in litres/100km) almost instantaneously ("almost" since carbies have the float bowl which would dampen the response somewhat).

What do you all reckon? Waste of time or interesting curiosity?

Aurel

Oh woops, I forgot to add: I figured some stuff out, does it seem reasonable?

Inputs:
speed: 80km/h
milage: 15litres/100km
Output:
fuel consumption rate is therefore: 3 1/3 ml /sec = 0.000 056 litres/minute

That's more than I was expecting.

Burket sell them helical flow meters , only problem is the cost of them .

you would be better to do what you did above.