Piper WARRIOR III PA-28-161 Pilot Operating Handbook page 170

SECTION 8
HANDLING, SERV & MAINT
(c) Filling Fuel Tanks
Observe all required precautions for handling gasoline. Fill the
fuel tanks through the filler located on the forward slope of the wing.
Each wing holds a maximum of 25 U.S. Gallons. When using less
than the standard 50 gallon capacity, fuel should be distributed
equally between each tank. There is approximately 17 gallons in the
fuel tank when fuel level is even with bottom of filler neck indicator.
(d) Draining Fuel Strainer, Sumps and Lines
The fuel tank sumps and strainer should be drained daily prior
to the first flight and after refueling to avoid the accumulation of
contaminants such as water or sediment and for proper fuel.
REPORT: VB-1565
8-14
PIPER AIRCRAFT CORPORATION
FUEL DRAIN
Figure 8-3
PA-28-161, WARRIOR III
ISSUED: JULY 1, 1994