Porsche 911 GT3 R 2012 Technical Manual page 41

Attention: The fuel pumps should not be activated under any
circumstances if tank-engine quick release couplings are
disconnected. Fuel pressure peaks in the system can cause
leakage, and in the worst case the system pressure can exceed
the burst pressure of the fuel filter.
4.2.1. Catchtank
Scavenge
main pump
Level sensor
Main pump
scavenge pipe
Reserve pump
scavenge pipe
The catch tank allows customized adjustment of the reserve volume. The
height of the scavenge point can be changed by adjusting the scavenge
pipe length. The standard scavenge pipe length for the main pump is set
for a reserve volume of 2.6 liters.
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