Very carefully, so as not to lose parts, disassemble the regulator and give it a good cleaning and flush the little passages. Reassemble and try again. Your pissing fuel problem is 90% likely to be in the regulator. Ensure that the gaskets seat well. If that fails, check the head. Remove the head and check that the valves are not burned and that they do not have excessive side play in the guides. Side play wears the seat to the point where the head is not repairable and this happens quickly. Ensure all screws are gutentight, firm and then a little bit more is my method.

It really sounds like you simply have a stuck regulator due to debris, maladjustment, or bad diaphram.

What fuel are you running? I use only 30% Heli Coolpower. I pay about $42.00 per gallon here but it is the only fuel that gives consistent result run after run after run.

Mark