Van's Aircraft HB-YMT, Flight Manual

Page: 144 / 181

HB-YMT Airplane Flight Manual
7–40 Description of the Airplane and its Systems 01/00
7.10.8 Fuel Manifold Valve
Fuel Manifold Valve Assembly:
The fuel manifold valve, also known as “fuel spider”,
distributes fuel equally to all engine cylinders by dividing the
metered fuel flow equally among the number of nozzles in
the system. The length and shape of individual fuel lines
could cause fuel flow to the cylinders to be uneven.
However, uneven flow can be minimized by selection of
proper fuel injection nozzle sizes and by avoiding sharp
bends or kinks in the fuel injection lines.
The fuel manifold valve contains one input fuel line from the
fuel metering unit and as many output lines to the fuel
injection nozzles as there are cylinders on the engine.
7.10.9 Injectors
Fuel Injection Nozzle Assemblies:
The function of the fuel injection nozzle is to atomize and
subsequently vaporize the metered fuel. The nozzle sprays
fuel continuously into the intake port of each cylinder head
where it mixes with induction air.
They must be cleaned at every 100hr inspection and are one
of the first things to look at when troubleshooting a rough
running engine.