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I too see the "first click" technique as a problem for accurate results. If the circuit was much longer (say a couple of hundred miles) it would be less of an issue, but the combination of a relatively short course and our fuel sipping cars makes for problematic results.
I'd like to come up with something for my car that will give me accurate, repeatable results. As mine is an old-school mechanical injection diesel, I don't think there is a electronic method that will work for me. What I'm working on is a simple mechanical float gauge attached to a funnel that will fit in my filler neck. The idea is that the funnel will be made to fit in only one position, as fuel enters the tank, the float will rise - pushing a thin fiberglass rod inside the funnel neck. With a reference indicator in the funnel and a "full mark" on the rod, truly accurate, repeatable fills should be guaranteed every time. Also, by using a graduated beaker, I can do this even when I run on 100% bio-diesel.
I don't know if this will work for everybody - as some cars have very twisty filler hoses, but mine is a straight shot of about 45 degrees into the top of the tank.
What do you all think?
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