User manual

Part B Section 12.28
08 FUEL PUMPS
Electric boost pumps switched from the yoke support the engine driven fuel pumps.
The engine pumps drain below the engine and can be a source of leakage.
Normal operating pressure is 14-16 psi
09 FUEL BOOST PUMPS
The electric boost pumps are used back up the engine driven fuel pumps when
necessary and to supply fuel pressure to the engines for starting.
The switches are on the yoke; t
hey are switched off after starting
Apart from during the start the Boost Pumps are used during
1) Takeoff
2) Landing
3) Cross Feed operation
4) Flight in turbulence
5) At pilot's discretion
To preserve their life, the fuel boost pumps are to be switched OFF whenever they are not
required.
10 PRIMING PUMPS
Electric priming pumps are operated from the yoke. They are used sparingly as it is easy
to over-prime. No priming should be done until the blades have been pulled through.
The primer sends raw fuel into the manifold, and this can create a fire hazard if too much
fuel overflows out of the manifold.
Priming will not occur unless the Booster Pumps are operating to give a minimum fuel
pressure of 14 psi.
11 FUEL PRESSURE GAUGES
Fuel pressure gauges are included in the central engine instrument panel. The presence of
static fuel pressure in the lines is checked prior to start and boost pumps should be used
to have fuel pressure reach and stabilize at a minimum of 14 psi.
12 CROSS FEED VALVES
The function of Cross Feed has been outlined above (see Fuel Cocks)
Incorrect use will cause unbalanced fuel flow from the tanks and may starve one fuel pump
of fuel causing it to overheat.
Stichting Catalina PH-PBY Rev No: 00
18 May, 2004 Page: 3