Fuel
The JetRanger II and III have the same fuel tank, which is a single-bladder type under the aft passenger seats, holding 76 US gallons (92 in later models), which can be increased to 96.7 with a range extender, giving you an effective 2.5 hours in the air (if a range extender is used, the minimum pilot weight needs to be 200 lbs). The tank is fitted with two boost pumps and quantity transmitters. The engine-driven fuel pump and fuel filter are on the engine casting. The fuel tank has its own C of G arrangements, meaning that the moment varies with the fuel load.
The fuel type is Jet A, A1 or B, JP4, JP5 or ASTM D 1655. The 206 A, B and BII are limited to -18 °C with JET A or JP5, as is the B III, unless it has a red triangle on the fuel pressure gauge which allows operation down to -32 °C.
The TAS for flight planning purposes is 100 kts, or 110 kts for the L.
Starting mechanism is either Ceco or Bendix. The latter uses air pressure between the governor and fuel control, while the latter uses fuel pressure. The Ceco is out of date, but is still around - the essential difference between the two is found when starting - with the Ceco, you can control the ToT with the throttle.
The flight manual says that boost pumps shall be on for all normal operations, so don't turn them off until after the engine when shutting down. However, when starting, many pilots use only the aft one, because having both on can mask problems with the engine driven pump, which needs help above 6,000 feet, hence the limitation (boost pumps in turbines are for bleeding lines and/or fuel draining – they create a lower than atmospheric pressure to suck fuel up).

Consumption
Normally, 29 US gals per hour.
Fuel type  Jet A 1 
Start, taxy and climb to 2000'  3 US gals 
Normal cruise consumption  29 US gph (114 lph) 
Unuseable fuel  2 US gals 
Minimum inflight contents  6 US gals 
Maximum contents  76 US gals 
Max contents with range extender  96.7 US gals 
Heater consumption  2 US gph 

LongRanger
The main concern is that fuel might get trapped in the two forward tanks.
The system actually has 3, with the main one is in the usual 206 location, and 2 smaller ones under each rear facing seat, interconnected for filling purposes, but using pressure from the boost pumps to create a venturi to suck the fuel from the forward tanks back into the main tank, from where it goes directly to the engine. As fuel to the engine can only come from the main tank, a problem in the transfer mechanism (usually from contamination) can mean fuel being trapped and unusable.
Cockpit indications are fuel quantity and pressure gauges, 2 boost pump warning lights and a fuel low light.