Chris, 

Regarding getting a low mileage from a tankful...

When you fill the tank it vents air from the top of the tank through a 
small diameter pipe leading up inside the filler pipe to avoid blow-back 
which would otherwise cause the fuel pump nozzle to shut off prematurely. 
It's very likely that when the tank was installed, care was not taken to 
ensure that the vent pipe was of the correct shape / correctly positioned 
for the bottom end to be tight against the top of the tank innards. If 
that's the case you will find that the tank will take another gallon or 
three if filled very slowly to avoid the delivery stopping. (Doing which 
leads to over-filling the tank whereupon after the filler cap is replaced 
it vents petrol out of the top vent (in the fuel-guage sender unit lid), 
either onto the ground or back to the engine-bay depending what fuel-system 
set-up you have).

Regarding the fuel gauge initially staying high - That's normal, the fuel 
lifts the float to it's topmost position before the tank is completely 
full, and it's normal for the reading to drop when the tank is tilted. In 
mine the float is near the front of the tank so the gauge will indicate 
about 1/8 tank low when under prolonged acceleration or when going uphill. 

HTH

Rgds
Bill

On Friday, January 8, 2016 at 3:53:01 PM UTC, SMIDG3T wrote:
>
> OK thanks for that. I'll look over that weekend to see what I can find. 

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