1.   Efficiency also hinges on adjusting the flame to the right size and color, adjusting the flow of gas or changing the fuel filter in an oil-fired system.

2.   In addition to the oil and filter change, this service usually consists of replacing the spark plugs, air filter, fuel filter and PCV valve.

3.   Then the fuel filters got stopped up.

4.   While peering under the hood, he hears a voice suggesting the source of the problem is the fuel filter.

5.   Ha sealed a leaking fuel filter with a bar of soap.

6.   The team also replaced two belts, four fuel filters and a plastic bottle that contains cooling water.

7.   This week FIA alleged that the dramatic fire at the German Frand Prix was the result of the team illegally removing a fuel filter.