Page 707 - PPL-engelsk 2025
P. 707
Aircraft general knowledge
8.5.3 Fuel systems
Here you can see the fuel system
for a Piper 28.
The illustration is just to give you
an idea of how an aircraft's fuel
system works.
In the following, we will review
some of the parts of the fuel
system and their use.
8.5.3.1 Fuel pump
Aircraft are usually equipped with a mechanical fuel pump in the engine and an
electric pump.
The primer (also called a priming pump) sprays fuel into the intake before one
or more cylinders. It is needed for engine start. Especially in the cold periods. The
POH will tell about how to start the engine and the use of priming.
The electric pump is used for engine start and as a back-up during take-off and
landing.
On high-wing aircraft, an extra fuel pump is not needed, as gravity does the job.
These are called gravity feed systems.
If your aircraft has an injection engine, a booster pump may be installed, which
is used to prime a cold engine before engine starts up.
Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 707
