Today I received a call from a customer about dead spots in yard. I went to customers house and inspected the spots. Two spots about 10 inches were bright light brown and two other spots were greyish in color and also about 10 inches in size. All were pretty much in a circle. Customer thinks it might be could be coming from mower stopped in these areas running while I was drinking water or talking with him and maybe mower is leaking gas or oil. My mower is new Exmark 36" Metro with mulching system and running with gator blades. I don't think it is coming from the mower. I have no leakage evidence on my trailer and not using oil.<p>Could it possibly be coming from weedeater or edger leaking? Both are Stihl. I lay them on the ground to start. I pump the primer bulb 5 times Pull the chord with choke up til moter fires....two or three pulls....then pull chord with choke down one time and motor starts. It is conceivable I could have started these tools in subjected areas. I refuel these tools at my trailer on the cage door which lays down as a shelf.<p>I am going to test these on dry areas and also in my grass to see what results I get. I will let you all know.<p>If any of you have experienced this problem please reply. Thanks.