Mmh, are you sure about that? I remember WoVII and did a short google search and found this, what fits my knowledge of the 109 and the start-up procedure (is also described a little below the picture).
http://www.a2asimulations.com/store/solo/bf109/
Quote:
Engine Starting
Cockpit Check - COMPLETE
Hold brakes.
Turn the battery switch ON.
Recheck fuel supply ON.
Turn the magneto switch on BOTH.
Set fuel cutoff control to ON.
Use manual fuel pump to pressurize the fuel lines.
Prime engine if cold using priming pump (3-4 shots).
Turn master ignition switch ON.
Engage starter switch until the engine starts.
Check engine instruments to confirm oil pressure rises to at least 4 kg/cm2 within 30 seconds.
Fuel pressure should rise to 1-1.8 kg/cm2.
Idle at 700 RPM until the oil temperature reaches 30 degrees C.
Turn ON generator.
Turn ON avionics.
Check all instruments for proper function.
After warm-up, idle at 800 RPM or slightly less.
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PS: For the German reading members:
http://www.deutscheluftwaffe.de/Flug...ung/Bilder.htm
Clearly indicates the fuel primer pump was necessary for start up.