Just an observation that might help someone,but Im sure you more experienced bike people will know this anyway,so apologies for ramble!

....FIT A FUEL FILTER
When I fitted my electric petrol pump it advised fitting an inline filter between the tank and pump.I fitted a transparent plastic bodied one. Today I was draining the tank to refill it and make a depth gauge as I filled it with measured amounts.I also wanted to check whether there was any obstruction as I felt the engine intemittently needed more fuel at some revs .
The Harley type tank valve also has a filter poking up into the tank. I removed the tank valve to check the inside filter,it was clean. The mesh is very fine and there isnt a split in it to let any big particles through.
BUT... the inline filter mentioned earlier looked a little dirty inside,I thought it was because it is in shadow under the tank. I removed it and it was really choked up with gritty particles,which Im assuming to be from the grinder when I was building the tank and also when I slit it to insert a baffle after I had run it on the engine.At the time, I washed the tank out several times,and thought it was clear.So it just goes to show how handy a fuel filter can be
I'll just go and ramble outside now!
Rod