Operation and maintenance manual

General Cleaning Instructions QSB4.5 and QSB6.7
Page i-14 Section i - Introduction
is 76 microns [0.003 in] in diameter. One micron measures 0.001 mm [0.00004 in.]. The contaminants being filtered
out are smaller than can be seen with the human eye, a magnifying glass, or a low powered microscope.
The tools used for fuel system troubleshooting and repair are to be cleaned regularly to avoid contamination. Like fuel
system parts, tools that are coated with oil or fuel attract airborne contaminants. Remember the following points
regarding your fuel system tools:
• Fuel system tools are to be kept as clean as possible.
• Clean and dry the tools before returning them to the tool box.
• If possible, store fuel system tools in sealed containers.
• Make sure fuel system tools are clean before use.