I know this was just brought up but wanted to put my experience on top.
A couple years ago I was fixing the brakes on my Pickup truck. Working in a closed shop. Heat off. Shop is 16 X 32 with 12 foot ceiling. Had a fluid leak where the new brake hose met the new caliper. I started the truck, pumped the brake and shut the truck off. Checked the leak and it was still leaking. Did this about 6 times. Truck probably didn't run a total of much more than a minute. About the 4th time I went from the back of the truck on the passenger side to the drivers side to start the truck and pump the brake I didn't feel well. The 5th time worse, the 6 time I could hardly walk. I didn't know what was wrong. After the 6th time I couldn't get up off the stool I was sitting on. I tried to call my wife in the house on my cell phone but couldn't figure out how to use it. I just sat there on my stool leaning against the truck. Carbon Monoxide never entered my mind. Thankfully my wife came into the shop and found me. She opened the door and called the ambulance and they took me to the hospital. I think what made my problem so serious was that I was working right by the exhaust pipe. I would start the truck, make a little cloud of carbon monoxide and go sit in it. About the time it would start to dissipate I would go start the truck and make another one and go sit in it again. Like I said before the truck probably didn't run much over 1 minute total.
You can never be too careful. Sometimes the smallest amount of carelessness can get you.
A couple years ago I was fixing the brakes on my Pickup truck. Working in a closed shop. Heat off. Shop is 16 X 32 with 12 foot ceiling. Had a fluid leak where the new brake hose met the new caliper. I started the truck, pumped the brake and shut the truck off. Checked the leak and it was still leaking. Did this about 6 times. Truck probably didn't run a total of much more than a minute. About the 4th time I went from the back of the truck on the passenger side to the drivers side to start the truck and pump the brake I didn't feel well. The 5th time worse, the 6 time I could hardly walk. I didn't know what was wrong. After the 6th time I couldn't get up off the stool I was sitting on. I tried to call my wife in the house on my cell phone but couldn't figure out how to use it. I just sat there on my stool leaning against the truck. Carbon Monoxide never entered my mind. Thankfully my wife came into the shop and found me. She opened the door and called the ambulance and they took me to the hospital. I think what made my problem so serious was that I was working right by the exhaust pipe. I would start the truck, make a little cloud of carbon monoxide and go sit in it. About the time it would start to dissipate I would go start the truck and make another one and go sit in it again. Like I said before the truck probably didn't run much over 1 minute total.
You can never be too careful. Sometimes the smallest amount of carelessness can get you.