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).
Fuel tank capacity, gauge accuracy, and servicing procedures.
| Identifier | ExFiles\Box 61\3\ scan0147 | |
| Date | 17th December 1930 | |
| Messrs.Rolls-Royce,Ltd., Date 17.12.30. Page 3 suppose an over-night loss of one gallon (which is only in exceptional cases), the gauge reads 10 gallons with 11 in the tank. The user estimates that the tank will be completely full if he adds 10 gallons, as the capacity on his dial is shown as 20. If there is just room in the tank for 21 gallons, then the objectionable feature of the running over of the last gallon is obviated. It would appear practically the same as you present arrangement,as the last marking on the dial is 20 gallons, the 21st gallon only being indicated by a line and not by a figure. Furthermore, without actually filling the tank installed on a car on both the near-side and off-side camber of the road, it cannot be definitely stated at the moment that the 21st gallon can be got in under all conditions of camber. (3). Servicing the Gauge. You will notice that the hole in the tank unit turret which comes directly opposite the vent tube, is of larger diameter than the others. This is to enable a rubber pipe to be pushed in over the top of the vent tube. It has been found of considerable assistance in cases where the gauge has had to be serviced, either in a repair shop or during experimental work which has necessitated the uncoupling of the air line when petrol is in the tank, to have a ready means of correcting the gauge without the laborious procedure of emptying the tank, or driving the car a sufficient number of miles to | ||