It ensures that after you service the fuel system, you can prime the system with fuel. It is a fuel pump, but usually I see them locally on the engine and not in the cab. The problem is that unless you are talking a Detroit Diesel with the unit injector, it is critical that you not have air in your fuel lines from the high pressure (injector) pump to the cylinder. The hand primer pump allows you to simply fill those lines with fuel after servicing it. It is generally optional, but if you have to bleed lines, you'ld wish it had one.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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