Hello and welcome
On the fuel note...
I run the 1600 with an SU carb.
This has a direct line in from a 30L fuel tank fed by a electric fuel pump.
In the line i have a fuel regulator which brings it down from 3PSI to 1PSI
The fuel pump is not pressure operated, it is either on or off.
So my carb gets fed the same amount of fuel when it is ticking over or when it is flat out (it never overflows)
The pump has a rating of 12 gallons a hour.
So in theory a 30L / 6 Gallon fuel tank should get me the same distance if driving flat out or very slowly.
But it dont!?

I can do 3 trials with it running all day, or a good 6-7 hour thrash round the fields on one tank?
Figure that one out..