Glossary “puncture sealing tire” Definition:
Specialty tire, made to permanently seal punctures up to 3/16 inch (4.76 mm), with a resultant rubber-compound sealer applied to the inside of the tire by the manufacturer.
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pumpdown
Glossary “pumpdown” Definition:
Term used for evacuate, as in an air-conditioning system. Also known as pulldown.
pumpkin
Glossary “pumpkin” Definition:
Removable differential third member.
pump screen
Glossary “pump screen” Definition:
Filter to remove debris from a fluid before it enters the pump.
pump up
Glossary “pump up” Definition:
Condition where a hydraulic valve lifter has developed more pressure than required and prevents the valve from seating properly.
pump impeller
Glossary “pump impeller” Definition:
1). Part of a fluid pump that causes the fluid to move. 2). The output drive member that receives its power from the engine.
pump link
Glossary “pump link” Definition:
In a mechanical fuel pump system, a short, connecting part between the pump rocker arm and the diaphragm on certain models.
pump reservoir
Glossary “pump reservoir” Definition:
Provides fluid and a reserve for proper pump operation.
pump rotors
Glossary “pump rotors” Definition:
Parts of a positive displacement pump that uses rotating rotors to develop flow.
pump housing
Glossary “pump housing” Definition:
Casting which surrounds the enclosed gears, rotors or vane mechanism and which faces the pump cover or stator support.
pulsed air-injection system
Glossary “pulsed air-injection system” Definition:
Device found in the exhaust emission system that injects pulses of ambient air into the exhaust as an aid in the burning of exhaust gases.
pump
Glossary “pump” Definition:
Device that transfers gas or liquid from one place to another and creates an increase in pressure or volume. See gear, rotor and vane type pump.
pump air bleed
Glossary “pump air bleed” Definition:
Small vent hole(s) in the mechanical fuel pump body that allow air to enter and leave the pump as the diaphragm moves back and forth.
pump cover
Glossary “pump cover” Definition:
Rear casting which faces the pump housing and its enclosed gears, rotor and vane mechanism. Also called “Stator support”.
pump gas
Glossary “pump gas” Definition:
Standard gasoline without any additives.
pulse trains
Glossary “pulse trains” Definition:
Repetitive series of pulses
pulse width
Glossary “pulse width” Definition:
Amount of time the pulse take to go from low to high and back to low again, conventionally measured at 50% of full voltage.
Pulse Width Modulation (PWM)
Glossary “Pulse Width Modulation (PWM)” Definition:
1). Method of electronic control where the frequency of the pulses remains the same, but the percentage of “On time” compared to “Off time” varies. 2). Characteristics of a continuous on-and-off cycling solenoid for a fixed number of times per second while the frequency of the cycles remains constant the ratio of on-time to off-time varies or is modulated
pulsed air system
Glossary “pulsed air system” Definition:
A shortened term for pulsed air-injection system.
pulse train
Glossary “pulse train” Definition:
DC voltage that turns on and off in a series of pulses.