206l fuel system
The L FUEL SYSTEM has the l/h pump wired direct battery,this is due to the a/c being built with ni cad batteries,a requirement of which is if a batt hot light comes on, then you are supposed to turn off the batt switch.This stops the batt from further over heating,but also turns off the r/h boost pump ,there fore if both pumps were wired to the bus bar as per the r/h pump, then there is no way of getting the fuel from the foreward tanks to the reartank as the boost pumps also operate ejector pumps in the fwd tanks These ejector pumps have a very small opening for the fuel to flow thru to draw fuel from the tanks to the rear tank and are subject to blockage from contamination, which causes NO fuel transfer from the fwd tanks to the rear.The fuel pump caution lights are operated by FLOW SWITCHES and not pressure switches as per 206A/B So if pump caution light is on then NO fuel is being pumped from that tank as there is no flow
This is why it is possible to have an engine failure due fuel starvation even though the fwd tanks show plenty of fuel remaining SO LOW FUEL LIGHT ON MEANS EXACTLY THAT ,lowfuel despite what gauge indicates
Lesson over!