About this detail of the Tiger
The Maybach engines of the Tiger E had direct fuel injection, bypassing the carburettors. This was sometimes needed to cold-start the engine.
This cross-section through the top of a HL 230 P45 engine [2, see page 42] shows a fuel injector nozzle (arrowed). There were four such nozzles, one below each carburettor. As you can see, they injected fuel directly into the air ducts leading to the cylinder heads.
This is the Tiger E at Saumur museum [1] . With the air filters removed, we can see the end of the pipe, labelled 'A'. This Tiger E has been fitted with a HL 230 P30 for some reason, therefore the pipe has the horizontal bend.
The fuel arrives from a sheathed pipe that enters the engine compartment through the firewall at 'B'.
On the crew side of the firewall, the sheathed pipe leads to a square device; a hand pump. This damaged example [4] , in a very early Tiger, has been painted white by museum staff.
This restored example in the Tiger at Bovington museum [5] has the correct colours. The pump handle (at left) is slightly raised.
[1] Survey of vehicle 251114, at Saumur, by Jean-Charles Breucque
[2] Jagdtiger technical history, Andrew Devey, Schiffer
[3] Workshop drawing 021 B 425 B1 : HL 230 external dimensions
[4] Survey of Tiger 250031, by Stephan Vogt
[5] Survey of Tiger 250122, at Bovington museum, by David Byrden