| Description | Date | Identifier | |
| Requesting the build of an experimental 20 HP 'O series' car with central oiling and a modified petrol tank. | 16th Jan 1929 | Box 106 \ 2 scan0036 | |
| Clarifying the position on modified tank units and gauges for 20 HP units. | 28th Jan 1929 | Box 106 \ 2 scan0037 | |
| Standardization of gauges for S.S. and 20 HP models and tank installations by Messrs. Hobson. | 27th Mar 1929 | Box 106 \ 2 scan0038 | |
| Chassis alteration note changing the material for the Set Screw (F.56269) for an Air Vent Connection. | 14th Nov 1929 | Box 106 \ 2 scan0039 | |
| The deletion of the two-level device from the petrol tank on the SS and 20 HP chassis. | 9th May 1929 | Box 106 \ 2 scan0040 | |
| Deletion of the two-level device for the 20 HP car. | 15th May 1929 | Box 106 \ 2 scan0041 | |
| Standardisation of a petrol tank to increase ground clearance. | 26th Mar 1929 | Box 106 \ 2 scan0042 | |
| Fitting of a new part onto a specific chassis, including test date and material costs. | 13th Apr 1929 | Box 106 \ 2 scan0043 | |
| Design snag with the new petrol tank filler position on the 20-HP chassis. | 20th Aug 1929 | Box 106 \ 2 scan0044 | |
| Modifications to the petrol filler, vent, and tank, as well as body length dimensions for the 20HP 'O' series chassis. | 28th Aug 1929 | Box 106 \ 2 scan0045 | |
| Revised petrol gauge fitting, its finish, and a new luggage grid design. | 6th Feb 1930 | Box 106 \ 2 scan0046 | |
| Design changes for a petrol gauge and petrol tank. | 27th Jun 1930 | Box 106 \ 2 scan0047 | |
| Design and fitting of the petrol gauge and other instruments, along with a note on a speedometer fault. | 14th Jul 1930 | Box 106 \ 2 scan0048 | |
| Proposal to reinstate the two-gallon petrol reserve on the 20/25 model. | 1st Jul 1930 | Box 106 \ 2 scan0049 | |
| Petrol tank reserve system for the 20/25 HP car. | 21th Jul 1930 | Box 106 \ 2 scan0050 | |
| Reversion to a reserve petrol supply in the main tank and deletion of the reserve supply from the Autovac tank. | 21th Jul 1930 | Box 106 \ 2 scan0051 | |
| Design modifications for a petrol tank for Japan 3, including increased capacity and simplified fittings. | 23th Jan 1931 | Box 106 \ 2 scan0052 | |
| Design review and critique of a Japan 3 petrol tank, with suggestions for modifications. | 29th Jan 1931 | Box 106 \ 2 scan0053 | |
| Design modifications and specifications for a petrol tank for the 'Japan 3' scheme. | 2nd May 1931 | Box 106 \ 2 scan0054 | |
| Proposing to operate the main reserve fuel system from the dash, requiring two pipelines instead of one. | 12th Feb 1931 | Box 106 \ 2 scan0055 | |
| Modifications to the reserve petrol supply for the J. 3 model, including dashboard control and purchasing a new pump. | 17th Mar 1931 | Box 106 \ 2 scan0056 | |
| Secret internal memo discussing the design and placement of the reserve petrol tap control on the Japan III and Continental Phantom models. | 23th Mar 1931 | Box 106 \ 2 scan0057 | |
| Redesign of the petrol pump to a fabric diaphragm model due to high costs. | 5th Apr 1931 | Box 106 \ 2 scan0058 | |
| Proposal to incorporate cost-saving features from the J.3 tank into the 20/25 'T' Series petrol tank. | 5th Jun 1931 | Box 106 \ 2 scan0059 | |
| Standardisation of a revised petrol filler with a hinged cap for chassis parts. | 15th Jan 1931 | Box 106 \ 2 scan0060 | |
| Form specifying the details for fitting a new part to a 'T' Series chassis, including the test handover date and associated costs. | 12th Feb 1931 | Box 106 \ 2 scan0061 | |
| Advantages of a new petrol pump design compared to the A.C. model, and its suitability for the 25HP. | 5th Jul 1931 | Box 106 \ 2 scan0062 | |
| Modifying the petrol tank seatings for the 20/25 HP 'T' Series chassis. | 9th May 1931 | Box 106 \ 2 scan0063 | |
| Modifications to the A.C. standard petrol pump and features of a newly proposed design. | 22th May 1931 | Box 106 \ 2 scan0064 | |
| Petrol pump lubrication, the use of a hard fibre washer, and the rigidity of the cross control tube. | 5th Jun 1931 | Box 106 \ 2 scan0065 | |
| New petrol tank design for the 'U' series to improve appearance and reduce costs. | 1st Aug 1931 | Box 106 \ 2 scan0066 | |
| Proposal for a new, more aesthetically pleasing Hobson petrol gauge fitting for the 25HP 'U' series petrol tank. | 9th Sep 1931 | Box 106 \ 2 scan0067 | |
| New scheme for a 25 HP petrol tank with an easy fixing for the Hobson Petrol Gauge. | 21th Sep 1931 | Box 106 \ 2 scan0068 | |
| Telephone conversation about a petrol pump, crankshaft balance weights, and the 'Japan III' project. | 5th Oct 1931 | Box 106 \ 2 scan0069 | |
| Test and calibration data for a K.S. 20 HP, 18-gallon petrol gauge arrangement. | 20th Oct 1931 | Box 106 \ 2 scan0070 | |
| Standardisation of a remote control for the petrol tank reserve compartment, operated from the dash. | 26th Aug 1931 | Box 106 \ 2 scan0071 | |
| Standardisation of Chassis Parts form detailing the chassis for a new part and associated costs. | 3rd Aug 1930 | Box 106 \ 2 scan0072 | |
| Design and operation of the J. 3. petrol pump and drive. | 15th Oct 1931 | Box 106 \ 2 scan0073 | |
| Arranging a meeting at Conduit Street regarding a car with a new type 25 HP petrol tank. | 4th Nov 1931 | Box 106 \ 2 scan0074 | |
| Simplification of the petrol gauge and the status of the J.3 chassis. | 10th Nov 1931 | Box 106 \ 2 scan0075 | |
| Experiments to regulate the automatic clutch spigot lubrication before abandoning the system. | 24th Nov 1931 | Box 106 \ 2 scan0076 | |
| Extract detailing modifications to the petrol tank for a model designated 'JAPAN 3'. | 26th Nov 1931 | Box 106 \ 2 scan0077 | |
| Correspondence regarding the design of the J.3 petrol tank and the electrical petrol gauge cover. | 26th Feb 1932 | Box 106 \ 2 scan0078 | |
| Standardisation of an 18-gallon petrol tank with a 2.5-gallon reserve. | 4th Jan 1932 | Box 106 \ 2 scan0079 | |
| Standardisation form for chassis parts detailing costs and series information. | 13th May 1932 | Box 106 \ 2 scan0080 | |
| Complaints about petrol spillage from a new hinged filler cap and proposing a hinged flap valve as a solution. | 13th May 1932 | Box 106 \ 2 scan0081 | |
| Experimental modifications for J.III and Phantom II petrol pumps. | 20th May 1932 | Box 106 \ 2 scan0082 | |
| Issues and comparisons between Phantom II and J.III petrol pumps. | 20th May 1932 | Box 106 \ 2 scan0083 | |
| Continued discussion on potential solutions for drawing fuel from the reserve tank. | 20th May 1932 | Box 106 \ 2 scan0084 | |
| Performance graph of petrol pump tests, plotting delivery and pressure against engine RPM. | 23th May 1932 | Box 106 \ 2 scan0085 | |
| Blueprint diagrams detailing the drilling limits for a petrol pump cover, with multiple cross-sections and measurements. | 23th May 1932 | Box 106 \ 2 scan0086 | |
| Cross-section drawing of an operating mechanism for a type TIV petrol pump. | 23th May 1932 | Box 106 \ 2 scan0087 | |
| Blueprint of an operating mechanism for a petrol pump part. | 23th May 1932 | Box 106 \ 2 scan0088 | |
| Print Hs.623, which shows the advantage of the port position on the original 40/50 pump. | 27th May 1932 | Box 106 \ 2 scan0089 | |
| Graph showing results of J.III petrol pump tests, plotting delivery rate against pump speed under various conditions. | 23th May 1932 | Box 106 \ 2 scan0090 | |
| Proposing a solution for priming the petrol pump after running dry using a small sealed reservoir. | 28th May 1932 | Box 106 \ 2 scan0091 | |
| Diagram of a dashboard-mounted reservoir for a petrol pump, showing a main and reserve fuel supply. | 30th May 1932 | Box 106 \ 2 scan0092 | |
| Complaints and proposed modifications for a new hinged petrol tank filler cap to prevent spillage. | 1st Jun 1932 | Box 106 \ 2 scan0093 | |
| Modification to a hinged filler cap to prevent petrol spilling. | 2nd Jun 1932 | Box 106 \ 2 scan0094 | |
| Modifications to a hinged petrol tank filler cap to prevent spillage. | 2nd Jun 1932 | Box 106 \ 2 scan0095 | |
| Modifications and a new scheme for a hinged petrol-tank filler cap. | 3rd Jun 1932 | Box 106 \ 2 scan0096 | |
| Tests on the petrol pump, engine performance, and potential modifications. | 30th Jun 1932 | Box 106 \ 2 scan0097 | |
| Tests on a Pathfinder pump focusing on the restriction of filter volume and smaller diameter pipe lines. | 30th Jun 1932 | Box 106 \ 2 scan0098 | |
| Test results for varying pipe diameters and filter capacities on pumping performance. | 30th Jun 1932 | Box 106 \ 2 scan0099 | |
| Continuation page of a specification document detailing pump delivery rates. | 28th Jun 1932 | Box 106 \ 2 scan0100 | |
| Blueprint detailing the modification of a petrol filter to reduce its capacity. | 28th Jun 1932 | Box 106 \ 2 scan0101 | |
| Graph showing petrol pump test results for the reduction of filter volume and smaller diameter pipe lines. | 28th Jun 1932 | Box 106 \ 2 scan0102 | |
| Comparative test results for a reduced volume Enot's petrol filter. | 8th Aug 1932 | Box 106 \ 2 scan0103 | |
| Petrol pump performance, detailing failures during tests and comparing the standard A.C. pump with a larger alternative. | 24th Aug 1932 | Box 106 \ 2 scan0104 | |
| Summary of troubles and resolutions concerning the petrol pump. | 24th Aug 1932 | Box 106 \ 2 scan0105 | |
| Unresolved and resolved issues with valve seats, filters, and petrol pumps. | 24th Aug 1932 | Box 106 \ 2 scan0106 | |
| Test report on an A.C. Petrol Pump Model 'C' detailing initial pumping times. | 23th Aug 1932 | Box 106 \ 2 scan0107 | |
| Cross-section blueprint of a petrol pump operating mechanism with load annotations. | 31th Aug 1932 | Box 106 \ 2 scan0108 | |
| Performance graph for an A.C. Petrol Pump Model C, plotting delivery rate against pump speed for different pipe diameters. | 23th Aug 1932 | Box 106 \ 2 scan0109 | |
| The requirement of a petrol pump and a specific crankcase for the 25 HP model. | 1st Sep 1932 | Box 106 \ 2 scan0110 | |
| Unexpected troubles and potential failure causes of petrol pumps. | 12th Sep 1932 | Box 106 \ 2 scan0111 | |
| The hybrid composition of the LeC.3278 petrol pump. | 16th Nov 1932 | Box 106 \ 2 scan0112 | |
| Proposal to simplify the petrol tank design for 20/25HP & Phantom II models by removing the existing two-level tank unit and filters. | 29th Nov 1932 | Box 106 \ 2 scan0113 | |
| Recommendation to remove filters from the petrol tanks of 20/25 HP and Phantom II chassis. | 5th Dec 1932 | Box 106 \ 2 scan0114 | |
| Proposal for the deletion of petrol filters from the main petrol tank due to the adoption of the Enots filter. | 6th Dec 1932 | Box 106 \ 2 scan0115 | |
| Standardisation of Chassis Parts form detailing the costs and timeline for implementing a new part. | 1st Sep 1933 | Box 106 \ 2 scan0116 | |
| Petrol spilling issues from filler caps on Phantom II & 20/25 HP models, detailing causes and proposed solutions. | 19th Apr 1933 | Box 106 \ 2 scan0117 | |
| Modifications to a fuel filler cap and tank to reduce fuel spillage and uneven washer wear. | 20th Apr 1933 | Box 106 \ 2 scan0118 | |
| Complaints of petrol spills from the 20/25 model's fuel tank and proposing a modification. | 20th Apr 1933 | Box 106 \ 2 scan0119 | |
| Producing drawings and fitting a petrol tank for a 20/25 HP chassis. | 25th Apr 1933 | Box 106 \ 2 scan0120 | |
| New design for petrol tank filler caps, referencing drawing LeC.3466. | 26th May 1933 | Box 106 \ 2 scan0121 | |
| Provision and quantity change of Baffle Plates for a 20/25 HP Chassis petrol tank. | 14th Jun 1933 | Box 106 \ 2 scan0122 | |
| Design of a non-spillable petrol tank filler, focusing on the lid and leather washer. | 5th Jul 1933 | Box 106 \ 2 scan0123 | |
| Non-spillable petrol tank filler cap. | 6th Jul 1933 | Box 106 \ 2 scan0124 | |
| Non-spillable petrol tank filler cap and improvements to a leather washer to prevent leakage. | 6th Jul 1933 | Box 106 \ 2 scan0125 | |
| Fitting a modified non-spillable petrol tank filler cap for a 10,000-mile test. | 18th Jul 1933 | Box 106 \ 2 scan0126 | |
| 20/25 HP Standardisation Sheet for a non-spillable petrol tank filler and extra baffle. | 20th Sep 1933 | Box 106 \ 2 scan0127 | |
| Standardisation of a non-spillable petrol tank filler for chassis parts. | 28th Jun 1933 | Box 106 \ 2 scan0128 | |
| Introduction of a new part to a chassis, including costs and test dates. | 12th Dec 1933 | Box 106 \ 2 scan0129 | |
| Requesting the production of parts for a new petrol tank scheme for 20/25 & 40/50 HP models. | 20th Jan 1934 | Box 106 \ 2 scan0130 | |
| Change of plan for fitting a petrol tank scheme to specific experimental cars. | 30th Jan 1934 | Box 106 \ 2 scan0131 | |
| Changing the designated vehicle for a petrol tank fitting from 27-EX to 22-EX. | 30th Jan 1934 | Box 106 \ 2 scan0132 | |
| Chassis modifications for the petrol tank and filler pipe on upcoming car series. | 18th Jan 1934 | Box 106 \ 2 scan0133 | |
| Parts required for a remote ventilation scheme for petrol tanks on 20/25 and 40/50 HP chassis. | 19th Jan 1934 | Box 106 \ 2 scan0134 | |
| Follow-up regarding the testing of a sealed petrol filler and separate vent for standardisation on car chassis. | 21th Feb 1934 | Box 106 \ 2 scan0135 | |
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