Cessna 177 Owner's Manual page 112

PILOT OPERATING PROCEDURES
PREFLIGHT FUEL SYSTEM CHECK
Fuel sampling: Fuel strainer, wing tank and reservoir quick drains.
1. Place a suitable container under the fuel strainer drain outlet prior to
operating the strainer drain control for at least 4 seconds. Check strainer
drain closed.
2. Inspect the fluid drained from the fuel strainer and each wing tank quick
drain for evidence of fuel contamination in the form of water, rust, sludge,
ice or any other substance not compatible with fuel. Also check for proper
"TAKE YOUR CESSNA HOME
fuel grade before the first flight of each day and after each refueling. If any
contamination is detected, comply with 4 below.
FOR SERVICE AT THE SIGN
OF THE CESSNA SHIELD"
3. Repeat Steps 1 and 2 on each wing tank quick drain.
4. If the airplane has been exposed to rain, sleet or snow, or if the wing fuel
tanks or fuel strainer drains produce water, the fuel reservoir(s) must be
checked for the presence of water by operating the fuel reservoir quick
drains. The airplane fuel system must be purged to the extent necessary to
insure that there is no water, ice or other fuel contamination.
NOTE 1: The fuel reservoir(s) are located under the fuselage
between the firewall and forward door post on all airplane models.
Consult the pilots Operating Handbook or Owners Manual in order
to determine if one or two reservoir(s) are installed.
NOTE 2: A check for the presence of water using the fuel reservoir
quick drains prior to the first flight of each day is considered good
operating practice.
CESSNA AIRCRAFT COMPANY
WICHITA, KANSAS
APPENDIX 86-19-11