Figure 1-16.-Common fuel tank locations.bum. The engine is fitted with a valve train to operatethe valves, as shown in figure 1-15.The camshaft is made to rotate with the crankshaftthrough the timing gears. The cam lobe is the raisedportion on the camshaft that contacts the bottom of thelifter. As the cam rotates, the lobe pushes up on the lifter.The cam lobe pushes the valve open against the pressureof a spring. As the cam lobe rotates away from the lifter,the valve spring pulls the valve closed. The properpositioning of the cam lobes on the camshaft establishesa sequence for the intake and exhaust valves.FUEL SYSTEMSThe function of the fuel system is to ensure aquantity of clean fuel is delivered to the fuel intake ofan engine. The system must provide both safe fuelstorage and transfer.FUEL TANKSFuel tanks store fuel in liquid form. The tank maybe located in any part of a vehicle that is protected fromflying debris, shielded from collisions, and not likely tobottom out (fig. 1-16). Most wheeled vehicles useremovable fuel tanks.Most fuel tanks are made of thin sheet metal coatedwith a lead-tin alloy to prevent corrosion. Fiber glassand a variety of molded plastics are also popular ascorrosion-resistant materials.The walls of fuel tanks are manufactured with ridgesto give them strength and internal baffles that increaseinternal strength and prevent the fuel from sloshing (fig.1-17). The filler pipe offers a convenient opening to fillthe tank and prevent fuel from being spilled onto theFigure 1-17.-Fuel tank construction.1-13
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business