From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Diagram and explanation of the operation of an AC fuel pump.
| Identifier | ExFiles\Box 149\1\ scan0115 | |
| Date | 20th March 1935 guessed | |
| AC-1100 Printed in U.S.A. THE AC FUEL PUMP IN OUT J K L A M N O B C E D G H F P How It Works By revolving shaft (G) the eccentric (H) will lift rocker arm (D) which is pivoted at (E) and which pulls linkage (F) together with diaphragm (A) held between metal discs (B) downward against spring pressure (C) thus creating a vacuum in pump chamber (M). Fuel from the rear tank will enter at (J) through strainer (K) and suction valve (L) into pump chamber (M). On the return stroke, spring pressure (C) pushes diaphragm (A) upward forcing fuel from chamber (M) through pressure valve (N) and opening (O) into the carburetor. When the carburetor bowl is filled the float in the float chamber will shut off the inlet needle valve, thus creating a pressure in pump chamber (M). This pressure will force diaphragm (A) downward against the spring pressure (C) where it will remain in the downward position until the carburetor requires further fuel and the needle valve opens. Spring (P) is merely for the purpose of keeping rocker arm (D) in constant contact with eccentric (H) to eliminate noise. | ||