What is the function of the fuel delivery pump in a petrol engine system______________________?
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Answer: C. pump fuel so that it reaches carburettor (to improve thermal efficiency)
Explanation
The mechanical fuel delivery pump in a petrol engine draws fuel from the tank to ensure a continuous supply to the carburetor float chamber. It maintains adequate positive fuel pressure to overcome line resistance between the rear-mounted fuel tank and the engine bay. Without this pump, gravity feed alone would be insufficient to maintain proper fuel flow under all operating conditions. Mechanical fuel pumps are typically diaphragm pumps driven by an eccentric cam on the engine camshaft. Electric fuel pumps are also common in modern vehicles, providing pressurized fuel delivery directly to fuel injection rails. Carbureted systems require low-pressure fuel delivery to prevent overwhelming the needle valve in the float chamber.
Injecting fuel directly into cylinders is the primary function of fuel injectors rather than low-pressure delivery pumps. The fuel pump supplies fuel continuously during normal operation rather than serving merely as a backup when carburetors fail. Claiming that fuel delivery pumps do not exist in petrol engines is incorrect because fuel must be moved from tank to engine.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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