Fuel System and Nozzles Flashcards

1
Q

What can add or subtract 100 PSI inside the Heavy-Duty Nozzle

A

Addition or Subtraction of the Shim by .002

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2
Q

Return Fuel- Opening Pressure Adjustment- Valve Lift Adjustment- Opening Pressure Spring- Locating Clamp- Fuel Inlet- Edge Filter- Nozzle Body- Nozzle Valve- Teflon Sealing Ring- Spray Tip.

A

Pencil Nozzle

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3
Q

Injection nozzles perform three functions:

A

1.Disperse fuel spray to mix fuel with air 2. Atomize fuel for efficient combustion 3. Complete nozzle shutoff to prevent fuel leakage

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4
Q

What type of brush do you use to clean nozzles?

A

Brass wire brush

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5
Q

Nozzle Test:

A
  1. Spray Pattern and Chatter 2. Opening Pressure 3. Valve leakage
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6
Q

Prime job of the diesel fuel system?

A

To inject a precise amount of atomized and pressurized fuel into each cylinder at the proper time

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7
Q

Major parts of the fuel system:

A
  1. Fuel Tank 2. Fuel Transfer Pump 3. Fuel Filters 4. Injection Pump 5. Injection Nozzles
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8
Q

The injection system must?

A
  1. Supply the correct quantity fuel 2. Time the delivery of the fuel 3. Control the fuel delivery rate
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9
Q

The fuel injection system must? (Continued)

A
  1. Break up or atomize the fuel 5. Distribute fuel evenly through the cylinder
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10
Q

Elements of fuel tanks?

A

Capacity 2. Size 3. Shape 4. Venting 5. Openings

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11
Q

Typical problems of the fuel tanks?

A

Leaks, condensation, dirt

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12
Q

Methods to locate a leak on tanks?

A

Wet method

Air pressure method

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13
Q

Two types of electric fuel gauges?

A

Balancing coil gauge

Thermostatic gauge

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14
Q

Types of diesel fuel lines?

A

Heavy-Weight
Medium-Weight
Light-Weight

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15
Q

Fuel filtration is critical because?

A
  1. Diesel fuel lines tends to contain particles and moisture 2. Injection parts are precision-fitted
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16
Q

Stages of a filtration system?

A

Filter Screen
Primary Filter
Secondary Filter

17
Q

Three ways fuel filtration can be done?

A

Straining
Absorption
Separation

18
Q

Dual filters function in?

A

Series

Parallel

19
Q

Types of injection systems?

A
  1. Early common rail 2. Accumulator 3. Injection Pump 4. Electronic Unit Injector 5. Electronic Injector/ High Pressure Common Rail
20
Q

Types of injection pumps?

A

In-line

Distribution

21
Q

Most common fuel injection pumps

A

Individual pump and nozzle for each cylinder

Pumps in common housing, nozzles for each cylinder (in-line

22
Q

Most common fuel injection pumps (continued)

A

Single pump serving injection nozzles for several cylinders (distributor)

23
Q

Important qualities of gasoline?

A
  1. Proper Octane rating 2. Easy Starting 3. High oxidation stability and freedom from gum
24
Q

Important gas qualities (continued)

A
  1. Freedom from foreign matter, (water and dirt) 5. Use of fuel additives 6. Volatility
25
Why are additives used?
To raise octane number and to combat gum formation and surface ignition
26
Factors affecting knock
Antiknock quality of gas | Octane number requirement of the engine
27
What is bad for your engine?
Alcohol
28
What do you add to your engine?
Dyes Antioxidants Carburetor detergents Antiknock additives
29
Diesel major grades
1 2 4
30
Sulfur
15 parts per million is Ultra low sulfur fuel
31
What is pour point?
Lowest temperature which fuel ceases to flow
32
What is cloud point/ gel point?
Temperature in which diesel becomes cloudy and forms wax crystals
33
When does the injection pump perform most efficiently?
When the fuel has the proper "body" or viscosity
34
What is flash point?
Temperature to which fuel must be heated to create a mixture of fuel vapor and air
35
What is Carbon residue?
The amount of material left after evaporation of the fuel
36
What is ash?
Small amounts of non burnable material
37
What factors should you consider in storing of fuels?
Protection and fuel quality Safety Convenience Cost
38
What conditions you must control for a satisfactory quality of your gasoline?
Control loss through evaporation Avoid gum deposits Protect from water and dirt
39
Types of close nozzles
Inward | Outward