If you are running at high rpms and turn the key off the unburned fuel will be pumped from the cylinders in the engine into the muffler. The muffler is still hot enough to ignite the unburned fuel.
would not be noticeable on your fuel consumption a few dollars a week.
Normally this only happens on twin cylinder engines when one of the cylinders is not firing.
its in the back by the sphincktor valve and muffler belt in the back by the sphinctor valve and muffler belt
You have too much oil in your gas, that's why oil and gas is coming out your exhaust.
you have to drop the muffler and the gas tank. it is a pain, but easily done. in the fuel tank
If it's a car with a carburetor, the unburned fuel will go into the exhaust system. Usually it will explode, blowing out your muffler. You will lose power steering, power brakes, etc. Not a wise move. It may also caused irreparable damage to the transmission.
becauce the muffler is (was) stopped up. If you switch of your ignition while driveing at speed, their is no spark to the plugs and the raw fuel wont explode till it gets to the hot muffler, many times this will damage your muffler, and creates a very loud backfire!
The fuel pump is shorting out and that is why the ecm fuse is blowing .Disconnect the the fuel pump and try it again,if the fuse blow's again then it is not the fuel pump.
pressure in the fuel tank with out a vented gas cap
Having a free flow muffler will help improve fuel economy. In most mufflers on the market the air flow is by having the exhaust air take two 180 degree turns u turns. This restricts the airflow and causes immense back pressure. Having a straight through airflow muffler will improve mileage which is just like removing a muffler. By removing a muffler there is reduction in weight and improvement in back pressure. You may be cited for driving without a muffler, as it is required for noise control and pollution control.
It's probably a heat shield, to protect the passenger compartment floor or fuel tank (or whatever is near the muffler) from excessive heat from the muffler. You could remove it, but why bother?