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).
Letter advising against deleting an overflow pipe due to potential fuel gauge issues related to atmospheric pressure.
| Identifier | ExFiles\Box 44\2\ Scan152 | |
| Date | 15th June 1928 | |
| Messrs.Rolls-Royce,Ltd., Date 15.6.28. Page 2 go into your vent pipe, which in its turn goes into the top of your side filler; this being in close proximity to ample vents to atmosphere. We do not know the size of these holes, but we believe that under the condition of the car running with an empty petrol tank on the vacuum tank reserve, an approximately atmospheric pressure is maintained in the tank. If this is not so, the liquid will be immediately sucked out of the gauge, which will cease to function on filling up. In the circumstances therefore, we would ask you to be good enough to retain the overflow pipe, as it is strongly against the advice of our Principals and Licensors, The King-Seeley Corporation, that it should be deleted. As an illustration of this, we would impress upon you the fact that what may happen to one particular car in the care of your Experimental Department, will not necessarily be confirmed in the thousands of cars that are in the hands of the public in service in all parts of the world. We can at the moment quote you an instance of an installation which has been unsuccessful, owing to the fact that our vent pipe was brought back into an area in the tank vent where atmospheric pressure was not maintained under conditions of filling up, and which therefore blew the gauge under certain | ||