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Propane Fuel Systems

Presented by

K

Kubota Engine America and Kubota Canada Ltd

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Characteristics of Propane

Also known as LPG, Liquified PetroleumGas.

LPG is heavier than air.

LPG is a by-product of oil and natural gasrefining.

1USgallon (3.79L) of LPG will create

272USgallons (1030L) of gas.

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Characteristics of Propanecont..

1USgal. (3.79L) of LPG at 24 : 1 ratio will create

1300ft3

(36.8m3

) or 10,000USgal. (37854L) ofcombustible gas.

In its liquid state it will boil at44oF.(-42oC)

LPG ignites between 957oF (514oC) to 1090oF

(588oC). Gasoline ignites at approx. 780oF(416oC).

LPG is a colorless and odorless gas. The odor isadded for safety.

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Propane Safety

LPG is a highly flammable fuelcontainedunder pressure and may cause fires and/or

explosions if improperly used.

LPG in its liquid state (-44

o

F /42

o

C) canfreeze skin.

When possible, turn off the LPG fuel supply

and run the engine until it runs out of fuel.

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Propane Safety

Perform repairs in a well ventilated area. Use only approved fittings and line.

Leak check all fittings, lines, and joints after

repair. Always front seat or back seat the main

supply valve.

Never check for leaks with a flame.

Cont..

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Benefits of Propane

Clean Burning.

Longer Engine Life.

Reduced Emissions.

Higher Octane (112).

Easily Transported and Stored. Non Poisonous.

Will Evaporate quickly if spilled.

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Basic Propane System

Pressure Tank

Shut Off Valve

Filter

Electric Shut Off Valve

Vaporizer Carburetor / Mixer

Engine

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Manual valve

Minimum operating pressure= 0.35Kg/cm

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Propane Vaporizer

Primary Chamber. Liquid fuel is

decompressed and evaporated.

Secondary Chamber. Decompresses gas to

approximately atmospheric pressure.

Water Passage. The engine coolant is used

to supply heat to evaporate the LPG.

Vacuum Lock Chamber. Locks fuel in the

primary chamber when engine is off.

Not Field Serviceable.

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Vaporizer

Secondary Chamber

Primary Chamber

Water Passage

Vacuum Lock Chamber

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Primary Chamber

Primary Valve and Seat

Primary Chamber

Primary Diaphragm Spring

Primary Diaphragm

Primary Valve Lever Spring

Primary Lever

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Secondary Chamber

Secondary Chamber

Secondary Valve and Seat

Secondary Valve Lever

Secondary Lever Spring

Diaphragm PinSecondary Diaphragm

Atmosphere Chamber

Balance Spring

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Vacuum Lock

Chamber

Vacuum Lock Chamber

Vacuum Lock Diaphragm

Diaphragm Spring

Primary Chamber

Secondary Chamber

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Carburetor and Mixer

Throttling Device. Creates Pressure Differential.

Blends Air and Fuel.

Multiple Fuel Capability. Gasoline and LPG Valves are Normally

Closed.

Shuts Off Fuel.

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Gasoline

Mode

Solenoid Energized

Float

Gasoline

Venturi Effect

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LPG ModeSolenoid Energized

From Vaporizer

Venturi Effect

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Mixer

Gaseous Propane from

Vaporizer

Venturi Effect

LPG Main Jet

Throttle Plate

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Propane Installation

Vaporizer must be mounted vertically.

Gaseous line must be 300mm +/- 20mm inlength. (11.8+/-.8)

Vaporizer, air needs to be bled from water

jacket after installation. All lines must be routed and secured to

avoid chaffing.

Vaporizer must be isolated from vibration.

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Propane Troubleshooting

No Start Fuel available.

Power to Solenoids.

Vacuum Source atVaporizer. 4(102mm)minimum.

Flooded. Disconnectvacuum line or unplugsolenoid to clear.

Look for Frost.

Throttle Plate Closed.

Low Power Shut Off Valves Fully

Open.

Look for Frost.

Check Vacuum Line for

Cracks or Restrictions.

Restricted Coolant Lines

to Vaporizer.

Atmosphere Port Blocked.

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Propane Troubleshooting

Engine Dies Fuel Available. Look for Frost.

Coolant to Vaporizer.

Power to Solenoids.

Vacuum to Vaporizer.

Atmosphere Port Blocked.

Engine Runs Rich Ruptured Primary orVacuum Lock Diaphragm.

Air Filter.

Gasoline Solenoid notClosing Properly.

Vaporizer Valves not

Seating Properly.

Cont..