PMN, you took the words out of my mouth! Cock your leg and look! The thing is, if you can't see petrol in the tank then you're running dangerously low! So time to stop, I've done this twice now, once I came home (just) with petrol only in the fuel line, and second time I ran-out of fuel on the track!
There is an alternative, if you remember the old copper fuel tanks on the old Bowman karts, being metal there was no way of knowing how high the fuel is so they had a "witness" pipe running on the outside of the tank, from a point as near to the bottom as possible, in which you could read the level. 100Nationals and some 250Nationals still have them.
You could manufacture such a line on your tank, if you're that commited, and run it in between yourself and the tank.
If you can find one, it is easier done with an old bottom feed tank, you use the bottom feed as the "witness" line running back up into the overflow and the top of the tank, whilst using a top feed for the supply.
Dan
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