DG Flugzeugbau GmbH
Flight manual DG-500M
4.5.1.2 Starting problems
a) The engine is equipped with an electric fuel injection (primer) instead
of a choke valve. The automatic control of the primer enables engine
starting with little risk of misoperation.
To inspect the correct functions of the primer there is a control light in
the front instrument panel which shines as long as fuel is injected
(primer valve open). With a cold engine also after releasing the starter
button fuel will be injected. The duration of the injection is dependent
on the cooling water temperature. With cooling water CHT above
38°C (100°F) no fuel will be injected during engine start.
If the engine will not fire or if the automatic control is defective it is
possible to control the primer valve manually via the switch located
next to the control light.
With position "on" fuel will be injected as long as the starter button is
pressed. To inject fuel after the engine fires you can keep the starter
button pressed as long until the engine runs smooth. The starter motor
will disengage by itself as soon as the engine starts.
With position "off" no fuel will be injected.
b) If you suspect that the engine is flooded, e.g. CHT just below 38°C
(100°F) and primer control light on, you should switch off the primer
and try to start the engine with full throttle. If the engine starts, wait
until 3000 RPM are reached, then reduce throttle to keep approx.
3000 RPM.
c) If with normal CHT (+5° (41°F) up to +38°C (100°F)) the engine does
not fire this may be a hint that the fuel filter is dirty and so the amount
of fuel injected is reduced. The filter has to be cleaned or replaced
before take off.
Take off with dirty fuel filter may result in RPM loss during take off!
Issued: February 1996 TN 843/7 App. 4.13
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