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).
Page 2 of a test report diagnosing a faulty fuel gauge, concluding the issue is likely an obstruction in the gauge, capillary, or its connections.
| Identifier | ExFiles\Box 44\3\ Scan061 | |
| Date | 5th November 1928 | |
| Messrs.Rolls-Royce,Ltd., Date 5. 11. 28. Page 2 baffles. Thus our conditions should represent the conditions on the car. The watch was started immediately on the petrol reaching the 20 gallon mark in the vase, and the readings were as follows:- Zero - Gallons on the gauge 16.5 30 secs. " " " " 19.5 40 " " " " " 19.75 50 " " " " " 20 60 " " " " " 20 18 feet of pressure balance air line, as used on the car, was connected to the tank unit of the gauge. Our conclusion from this test is that there is no restriction caused by the small transference of air necessary in either pressure or pressure balance line, as these results practically coincide with the results obtained with this same gauge on our shimming board with- out the air line in circuit. We believe therefore that there must be an obstruction in the gauge fitted on your car, which shows a much more pronounced lag in registering than the above, or possibly there is an obstruction or fault in one of the air lines. We are much more inclined to believe that it is a faulty gauge, caused by an obstruction in the capillary or its connections. | ||