Tested engine operation and cooling. Cooling is good with no hot cylinders. The right side of the engine runs richer than the left side. Noted that the fuel pressure would lower from 6 - 7 lbs to 1 - 2 lbs when the engine was warm and power was reduced to nea ridle. When the engine was stopped for a few minutes and a hot start attempted it was very difficult to get fuel pressure due to vapor in the system. The fuel system needs to have better venting of air and vapor in the fuel lines. Fuel was 92 octane auto fuel with no ethanol. I used auto fuel to test worst case fuel.
