![]() ![]() Each fuel tank is air vented via an individual vent duct and a vent float valve to the surge tank which in turn is connected to atmosphere through a NACA port, under the wings. As the fuel is consumed air fills up the space. The venting system ensures positive pressure for the whole flight envelope. Capacity of the vent surge tank is 100 Liters. The collected fuel is sent back to the main tank via vent duct. It recovers fuel from the vent lines, caused by thermal expansion of the fuel in the main tank. ![]() The vent surge tank is not a storage tank, it is a part of the venting system. If the feeder jet pump fails, the flaps in between the main tank and feeder tank open and facilitate the fuel flow. The feeder compartment is kept full by a feeder jet pump that transfers fuel from the main fuel tank.The LH feeder compartment has temperature probe, the only probe for measuring fuel temperature and the same is displayed on the central instrument panel. The feeder compartment is always maintained full and protects the engine feed against negative or lateral load factors. The capacity of feeder compartment is 200 liters (160 Kg). The Inboard feeder compartment normally supplies the respective engine and contains most of the pumps and control valves. Three per tank are installed on the lower surface of the wing. They are drained through manually operated self closing drains. Water if any are collected on the lowest parts of the tank. Three access doors are located on the upper surface of the wing at either end of the tank to allow access to essential equipment. An additional volume in each tank allow 2% thermal expansion of fuel without spillage. The main tank stores majority of the fuel, the capacity of one wing tank is 2500 Kg.
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