Fuel pouring out carburetor

[guyguerra]

I am breaking in a new OS 105HZR motor on my Gaui NX7. Today was the 8th flight I've done. I landed after the first flight and was going to check the temp of the motor. The motor died on its own before I could get to it. When I walked up to the heli I saw that fuel was fast dripping out of the carburetor intake. I had to take the glow plug out 4 times and spin the motor to get the fuel out. It finally ran again.

What would cause fuel to run into the carburetor after the motor is off?

Some side notes. When I got the motor I left the needles at factory settings (I didn't verify they were correct) as the last 105 I bought had the needles set correctly. When I first ran this one I thought it was lean, and checked it. The High needle was only out 1 turn and the mid needle was out about 1/2 turn. The manual calls for 2 1/2 turns on the high needle and 1 1/4 turns on the mid. I set them to that, which seemed pretty rich, then after 5 flights I started using my temp gauge and dialed the high back in to about 2 turns to get 180 degrees. I live in Florida and did this last week in Florida weather. I am now in north Georgia and its much colder and 2000 feet higher. I had trouble holding idle so I turned it back to 2 1/2 turns on the high.

Could there be a problem with the needles, which would have caused the factory to have them closed more than what the manual says?

Does a 2000 ft elevation require a different adjustment?

[Rodney Kirstine]

2000 feet makes a huge difference and if you didn't adjust the needles, going up that much in elevation, it would definitely be too rich.

[Stevin]

Your regulator is getting stuck open, most will tell you to open it a clean it out because some debris got in there. I have seen this happen numerous times on all os regulated motors and imo is an ongoing issue

[guyguerra]

I've put ten more flights on it over the last two days and it hasn't happened again. I haven't done anything different other than to pull the plug and crank it a bunch of times to blow the fuel out. I had to do that three times. It has been running perfectly ever since. I can only figure it was an intermittent or one time situation where the regulator stuck open. I'll post here if it happens again. Thanks for you advice.
Guy

[Stevin]

It will happen again and you will have to do the same thing. It's just a pain in the ass