Liquid Fuel Engine Diagram
•Below is a diagram of a very simplistic view of the inner workings of a liquid fuel rocket engine.
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•As you can see, is consists of two larger tanks, a pump system, a combustion chamber, a throat and exhaust nozzle. •A common fuel is RP-1 (Kerosene similar to Jet Fuel). A common oxidizer - liquid Oxygen (LOX).
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http://upload.wikimedia.org/wikipedia/commons/f/f7/LiquidFuelRocketSchematic.jpg http://upload.wikimedia.org/wikipedia/commons/8/82/Liquid_Oxygen.gif
LOX
http://images.lowes.com/product/converted/023857/023857738513lg.jpg
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http://www.3dinstruments.com/images/categories/4.5%20inch%20Process%20Gauge.JPG
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colfire
Also add that Helium tanks are used to pre-pressurize the fuel/oxidizer tanks up to flight pressure as it does not add weight and does not mix easily into other chemicals, likes to stay chemically separated.