The document is a seminar paper submitted by a mechanical engineering student named Sivakumar about mechanical fuel pumps. It introduces mechanical fuel pumps, noting they are mounted on engines and contain an airtight, flexible diaphragm linked to a rocker arm that rests on an offset section of the engine camshaft. A diagram is included, and the working explains that when the carburetor float bowl is full, the inlet valve closes, increasing pressure in the line to the pump and pushing the diaphragm down against a spring.

1. EXCEL POLYTECHNIC COLLEGE
DEPERTMENT OF MECHANICAL
ENGINEERING

2. SEMINAR
THERMALAND AUTOMOBILE
ENGINEERING
STUDENT SIGNATURE STAFF SIGNATURE

3. NAME :SIVAKUMAR.S
TITTLE :AC MECHANICAL FUEL PUMP
REG NO:16230473
SUBJECT: THERMAL AND AUTOMOBILE
ENGINEERING
SECTION : C
DEPERTMENT : MECHINICAL

4. INTRODUCTION
Mechanical fuel pumps which is mounted on engine. It
contains an airtight, flexible diaphragm attach which is
linkage to a rocker arm.
The rocker arm rests on offset or an eccentric, section of
the engine camshaft. When the engine is running.

5. DIAGRAM

6. WORKING
 When the carburettor float bowl becomes full of
fuel, the carburettor inlet valve closes due to
which pressure in the line leading to the pump
increases.
 This back pressure is transmitted to the pump
diaphragm due to which it remains in the lower
position against the pressure of the diaphragm
spring,

7. THANK YOU