The engine can act lean when it first starts up. This is because pressure has not built up in the tank. You need to get the engines to warm up slowly. On the airplane engines I tend to run them at about 1/3 power for 30-40secs and then take them up to full power...If it starts to act lean I back it down and slowly come up again.

When the engine is cold and the pressure in the tank is not up spec there is not enough fuel flowing through the regulator when you are at high power settings. This is becasue the regualtor and needle valve are adjusted for the engine under operating temps and pressure in the tank.

So to help the situation. Fill the tank with fuel, close off the pressure line with the check valve and add a little extra pressure with your fuel pump. This will give the tank a little head pressure to start off. It will help it get up to pressure quicker.


Troy Newman
Team YS