12.30.2(b) . fuel quantity indicators; 

– electronically operated fuel gauges are in the cockpit
– callibrated to be most accurate in the straight and level attitude
– if possible always back up reading by a visual check of the contents of the fuel tanks during pre-flight inspection using a dipstick.

12.30.2(a) . fuel tank, sump, drain point, supply line standpipe, vents, overflow drain; 

Fuel tank
– Contains the aircrafts fuel.
Sump
– A low spot in the tank where contaminants (mostly water) can drain to.
Drain point
– A valve/tap in the sump through which contaminants can be drained.
Supply line standpipe
– the entry point of the fuel supply line. Normally stands up above the bottom of a sump in order to prevent contaminants from entering the supply line.
Vents
– incorporated to compensate for pressure changes caused by temperature changes which cause air/fuel in the tank to expand and contract.
Overflow drain
– allows fuel to drain if expansion or overfilling results in an excess of fuel in the tank.

12.30.2. Describe the function of the following components of a simple fuel system:

12.28. Fuel System Components

12.28.4. Describe the correct management of the fuel system, including fuel selection and handling of priming and auxiliary pumps. 

Fuel Selection
– fuel tank selection must be checked before start-up.in the takeoff and landing DVAs and as part of periodic operating checks
– check fuel contents and the fuel tank selection visually
– check the selector by hand to ensure seated correctly in it detent

Priming pump
– hand operated and located in the cockpit
– used to prepare the engine for starting by pumping amount of raw fuel into the induction manifold near to one or more cylinders
– normally required for cold engine on a cold day
– follow recommendations in the POH
– avoid temptation to use too many pumping strokes
– Primer must be locked when the engine is running to prevent excessive fuel being drawn into the cylinders which would cause an over rich mixture rough running and possible engine stoppage
-auxiliary pumps are used as back up in situations where failure of the engine driven pump could be critical.

12.28.2(b) . fuel primer, engine-driven pump, auxiliary (boost) pumps. 

Fuel Primer
– on carburettored engines a hand operated pump is used to deliver fuel into the manifold to help with starting. On fuel injected engines electric boost pumps are normally used for priming.
Engine-driven pump
– pump necessary on low wing aircraft to lift the fuel from the wings to the engine
= engine driven pump operates whenever the engine is running
Auxilliary (boost) pumps
– electrically driven pump which is controlled by the pilot used as back-up to the engine driven pump. (eg for take-off, approach/landing, when changing tanks and other situations where a pump failure could be critical)

12.28.2(a) . fuel selector valve, supply line, strainer and strainer drain; 

Fuel selector valve
– enables the pilot to select fuel ON or OFF
– in some aircraft individual tanks can be selected
Supply line
– transports fuel from the tank to the engine
Strainer
– Located at the lowest point in the supply line. Filters contamination and incorporates a sump the contain any water or other contaminants.
Strainer drain
– allows the strainer sump to be drained. (normally part of pre-flight)

12.28.2. Describe the function of the following components of a simple fuel system:

12.26. Electrical System - DC

12.26.10(c) . blown fuse or popped circuit breaker. 

– Popped circuit breaker or blown fuse can (if no obvious cause) be reset or replaced once. If the circuit fails again dont try to reset.