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).
The functionality and installation of a standard A.C. vacuum fuel pump.
| Identifier | ExFiles\Box 40\3\ Scan077 | |
| Date | 26th June 1928 guessed | |
| - 2 - VACUUM PUMP This fits the standard A.C. fuel pump mounting and cam. We shall send it to England as we understand they are trying the A.C. pump. The use of a vacuum pump with the ordinary vacuum feed is the same system as now used by Cadillac with success. Stewart Warner claims, as compared with any straight pumping system, the advantage of a big reserve supply of fuel for emergency demands. In mounting the pump they apparently take a connection from the tank to the pump in parallel with the line from tank to intake manifold. A spring loaded check valve on the latter closes when the vacuum falls, leaving the pump only working to exhaust the vacuum tank. It would seem simpler to connect the tank to the vacuum pump intake and the exhaust outlet of the pump to the manifold. Mr. Johnson, representing the Stewart Warner Company, could not tell us what objection there was to the latter method. OY. | ||