Lesson 1/learning Event 3
Learning Event 3:
DESCRIBE THE PROCEDURES FOR INSPECTION OF GASOLINE ENGINE FUEL
SYSTEMS
INTRODUCTION
The fuel system has only one purpose: To provide the proper air-fuel mixture in the proper amounts to the
proper place at the proper time.
Each component in the system has to be operating properly for the fuel system to do its job. This is where
you, the wheeled vehicle mechanic, fit into the picture. Your job on fuel systems will consist of ensuring
that each component is doing its job.
To do this, you will have to know how to clean, tighten, test, adjust, repair, and replace fuel system
components in a gasoline fuel system. We are now going to cover the inspection of these parts. The
contents of this lesson are examples of the jobs you, as a unit maintenance mechanic, will do.
Keep in mind, always, when you are working on the fuel system, that gasoline is made to burn in the engine
and not on it. Neither should it burn in the tank, on the floor, or on you.
Make sure the work area is kept free of spilled gasoline and that there are no sparks or fire in the area.
INSPECTION OF FUEL SYSTEM
Before any work is done on a fuel system, you must know what needs to be done. One way to find out is
to inspect the system. This means look it over and see if you can find anything wrong. When inspecting,
you should start at one end of the system (either end) and work step by step all the way through. Don't
miss a thing.
We will start with the fuel tank on a 1/4-ton M151. The first thing you see on this is the filler neck cap, so
let's take it off and take a good look at it. Two things you should look for are dirt and rust. Neither of
these should be given a chance to get into the fuel tank because they can cause a lot of trouble. In fact, they
probably cause more fuel system trouble than anything else, except possibly water. Another thing to look for
on the cap is the retaining chain, which keeps the cap from being dropped and lost. Also, the gasket in the
cap must form a good seal between the cap and the filler neck.
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