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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 performance of various petrol pumps and the speedometer.

Identifier  ExFiles\Box 108\1\  scan0202
Date  10th September 1937
  
14.

High Pressure Petrol Pump on engine foot.
S.U. Single Unit.
This pump was particularly noisy in operation and discarded in favor of other systems tested.

High Pressure Petrol Pumps in Frame.
S.U. Double Pump as fitted to Ph.III.
These proved satisfactory and the best system tried.

A.C. Mechanical pump attached to Engine.
This pump failed due to vapour on acceleration after halt at high temperature, bringing car to standstill, and would not prime itself again in a reasonable period.

S.U. Petrol Pumps on Dash.
Standard Production on 25/30.
These primed when A.C. pump would not, but owing to vapour limited maximum speed on gradient to 20M.P.H. in second gear.

Apart from known faults with the wiring scheme, no other trouble was experienced with the electrical equipment.

Speedometer.
It was practically impossible to read the trip at night and not easy in the daylight. A modification to the shape of the windows has been called for.
  
  


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