| Description | Date | Identifier | |
| Graph showing comparative tests of a sports petrol pump with a standard spring versus a strong spring. | 27th May 1933 | Box 27a \ 2 Scan181 | |
| Technical drawing for a petrol pump cover. | 8th Jun 1933 | Box 27a \ 2 Scan182 | |
| The manufacturing and testing procedures for new in-house Bentley petrol pumps. | 3rd Jun 1933 | Box 27a \ 2 Scan183 | |
| Performance graph for a Bensports petrol pump, plotting head against pump RPM. | 28th Mar 1933 | Box 27a \ 2 Scan184 | |
| Mostly blank document page with a purple ink stamp. | 7th Jun 1933 | Box 27a \ 2 Scan185 | |
| New petrol connection designed by Messrs. Benton & Stone Ltd to prevent pipe breakage on rubber-mounted engines. | 7th Jun 1933 | Box 27a \ 2 Scan186 | |
| Modifications to the petrol pump on a 3.5 litre Bentley chassis. | 9th Jun 1933 | Box 27a \ 2 Scan187 | |
| Faulty spare petrol pump that stalls when the engine is hot. | 17th Jun 1933 | Box 27a \ 2 Scan188 | |
| Advice note from W.H.M. Burgess regarding a 12-volt pressure pump on loan. | 16th Jun 1933 | Box 27a \ 2 Scan189 | |
| Letter from S.U. Company regarding a car test and a diagnosis of a pump sticking issue caused by diaphragm shrinkage. | 26th Jun 1933 | Box 27a \ 2 Scan190 | |
| Issues and recommendations for the Bentley's petrol pipes and filter layout. | 27th Jun 1933 | Box 27a \ 2 Scan191 | |
| Letter from The S.U. Company regarding the supply of four different pressure pumps and a spare body. | 1st Jul 1933 | Box 27a \ 2 Scan192 | |
| Letter to The S.U. Company concerning the return of two sticking pumps for examination. | 3rd Jul 1933 | Box 27a \ 2 Scan193 | |
| From 'Lp' to 'Rm' attaching correspondence with The S.U. Company. | 3rd Jul 1933 | Box 27a \ 2 Scan194 | |
| Letter to the S.U. Company regarding a petrol pump for 19/G.IV, which is now with the Experimental Department. | 3rd Jul 1933 | Box 27a \ 2 Scan195 | |
| Letter from The S.U. Company regarding a faulty pressure pump and requesting its return for verification. | 29th Jun 1933 | Box 27a \ 2 Scan196 | |
| Letter to Mr. Skinner of The S.U. Company regarding a pump being returned to the works. | 7th Jul 1933 | Box 27a \ 2 Scan197 | |
| Letter to The S.U. Company regarding the failure of a supplied petrol pump due to incorrect rubber rollers. | 13th Jul 1933 | Box 27a \ 2 Scan198 | |
| Relocation of the Bentley petrol tap to achieve a 50% saving in piping. | 14th Jul 1933 | Box 27a \ 2 Scan199 | |
| Letter from The S.U. Company regarding trouble with rubber rollers and proposing alternative materials. | 15th Jul 1933 | Box 27a \ 2 Scan200 | |
| Tests on Bensport petrol pumps to investigate a drop in flow across the S.U. carburetter. | 20th Jul 1933 | Box 27a \ 2 Scan201 | |
| Test report on the Bensport Petrol Pump, detailing pressure restrictions caused by various carburetter float chamber parts. | 11th Jul 1933 | Box 27a \ 2 Scan202 | |
| Test results and data for modifications to S.U. carburetter float chamber covers on a Bensport petrol pump. | 15th Jul 1933 | Box 27a \ 2 Scan203 | |
| Test report on petrol pump modifications and their effect on delivery rates. | 15th Jul 1933 | Box 27a \ 2 Scan204 | |
| Reduction of restriction by modifying a needle valve seat and needle lift. | 15th Jul 1933 | Box 27a \ 2 Scan205 | |
| Graph comparing the delivery rates of a Bensport petrol pump with varying needle valve bore sizes and configurations. | 22th Jun 1933 | Box 27a \ 2 Scan206 | |
| Stamped by the Print Room in Derby. | 11th Jul 1933 | Box 27a \ 2 Scan207 | |
| Graph of delivery vs pump speed for a Bensport petrol pump, showing restrictions imposed by various S.U. float chamber parts. | 23th Jun 1933 | Box 27a \ 2 Scan208 | |
| Performance graph of Bensport petrol pumps, plotting delivery rate against pump speed for four test units. | 28th Jun 1933 | Box 27a \ 2 Scan209 | |
| Reference number and a company stamp on the reverse of a document. | 15th Jul 1933 | Box 27a \ 2 Scan210 | |
| Blueprint diagram showing modifications to an S.U. float chamber cover for Bensport petrol pump tests. | 18th Jul 1933 | Box 27a \ 2 Scan211 | |
| Page stamped by the Print Room in Derby. | 20th Jul 1933 | Box 27a \ 2 Scan212 | |
| Letter to AC-Sphinx Sparking Plug Co. Ltd. arranging a meeting to discuss radiators and petrol pumps. | 21th Jul 1933 | Box 27a \ 2 Scan213 | |
| Unsuccessful effort to reproduce a vapour lock issue on 4.B.IV. | 24th Jul 1933 | Box 27a \ 2 Scan214 | |
| Temperature readings from tests investigating vapour lock trouble using different fuels and components. | 24th Jul 1933 | Box 27a \ 2 Scan215 | |
| Issues with Bentley petrol pumps and a comparative analysis with A.C. pumps following a visit to their works. | 26th Jul 1933 | Box 27a \ 2 Scan216 | |
| Technical comparison of pump specifications, performance characteristics, and testing procedures. | 26th Jul 1933 | Box 27a \ 2 Scan217 | |
| Page detailing pump testing procedures for speed, pressure, and priming. | 26th Jul 1933 | Box 27a \ 2 Scan218 | |
| Test report on modifications to S.U. carburetter float chamber covers, detailing changes in fuel delivery rates. | 27th Jul 1933 | Box 27a \ 2 Scan219 | |
| Report page detailing tests on production versus experimental pumps and their components. | 27th Jul 1933 | Box 27a \ 2 Scan220 | |
| Requesting the creation of two new moulds to improve petrol pump diaphragm shapes. | 31th Jul 1933 | Box 27a \ 2 Scan221 | |
| Blueprint for a diaphragm former for a petrol pump. | 28th Jul 1933 | Box 27a \ 2 Scan222 | |
| Blueprint for a Diaphragm Former for a Petrol Pump. | 18th Jul 1933 | Box 27a \ 2 Scan223 | |
| Bulletin on axle and fuel pump maintenance procedures for Ford vehicles. | 18th Jul 1933 | Box 27a \ 2 Scan224 | |
| Instructions for the dismantling and re-assembly of a fully floating axle. | 18th Jul 1933 | Box 27a \ 2 Scan225 | |
| Maintenance and repair instructions for a Ford fuel pump, detailing component replacement and reassembly procedures. | 18th Jul 1933 | Box 27a \ 2 Scan226 | |
| Ford Bulletin page detailing the re-assembly procedure for a fuel pump with an exploded diagram. | 18th Jul 1933 | Box 27a \ 2 Scan227 | |
| Ford Bulletin page with assembly instructions for a B-type pump, detailing the diaphragm and body components. | 18th Jul 1933 | Box 27a \ 2 Scan228 | |
| Bulletin page with instructions for testing a fuel pump and fitting a new hand brake lever. | 3rd Aug 1933 | Box 27a \ 2 Scan229 | |
| Issues with Bentley petrol pumps, including vapour lock and carburation problems. | 3rd Aug 1933 | Box 27a \ 2 Scan230 | |
| Performance graph showing fuel consumption (PTS/BHP HR) against engine speed (RPM) for a Bentley engine with varying fuel head pressures. | 31th Jul 1933 | Box 27a \ 2 Scan231 | |
| Page with a 'Print room' stamp from Derby. | 3rd Aug 1933 | Box 27a \ 2 Scan232 | |
| Instructing a halt on work for the 3 1/2-Litre Bentley petrol pump due to poor performance and a proposal to switch to electric pumps. | 8th Aug 1933 | Box 27a \ 2 Scan233 | |
| Letter from The S.U. Company discussing recommendations for fitting a pump on a chassis to avoid vapour lock. | 23th Aug 1933 | Box 27a \ 2 Scan234 | |
| Letter from The S.U. Company regarding a pump with a stronger spring and the issue of burning points. | 28th Aug 1933 | Box 27a \ 2 Scan235 | |
| Letter to the S.U. Company Ltd regarding inconsistencies and faults found in their petrol pumps. | 28th Aug 1933 | Box 27a \ 2 Scan236 | |
| Letter from The S.U. Company regarding a higher pressure pump sent for evaluation. | 28th Aug 1933 | Box 27a \ 2 Scan237 | |
| Specifying the location of 'The fountain Hotel'. | 2nd Sep 1933 | Box 27a \ 2 Scan238 | |
| The mounting arrangement for Bentley twin electric petrol pumps on a dashboard. | 2nd Sep 1933 | Box 27a \ 2 Scan239 | |
| Letter from The S.U. Company regarding the supply of pump parts, leaflets and longer screws for earth connection. | 8th Sep 1933 | Box 27a \ 2 Scan240 | |
| Sending drawing LeC.3626 for the petrol piping of Bentley Twin Electric Petrol Pumps. | 9th Sep 1933 | Box 27a \ 2 Scan241 | |
| Delivery spring tests for S.U. petrol pumps, detailing the particulars of three different springs. | 4th Sep 1933 | Box 27a \ 2 Scan242 | |
| Fuel pump delivery rates and maximum pressures under various test conditions. | 4th Sep 1933 | Box 27a \ 2 Scan243 | |
| Pump performance test results, examining the effects of varying battery voltage and temperature. | 13th Sep 1933 | Box 27a \ 2 Scan244 | |
| Test result of 'Autoflux' petrol pump. | 13th Sep 1933 | Box 27a \ 2 Scan245 | |
| Testing S.U. petrol pumps to investigate noise issues when operating on low fuel levels. | 13th Sep 1933 | Box 27a \ 2 Scan246 | |
| Results of end-to-end tests on S.U. electric pumps with various pipe configurations. | 14th Sep 1933 | Box 27a \ 2 Scan247 | |
| Three proposed modifications to the Twin S.U. Petrol Pump. | 21th Sep 1933 | Box 27a \ 2 Scan248 | |
| Issues with contact point alignment and noise on the S.U. Twin Petrol Pump. | 22th Sep 1933 | Box 27a \ 2 Scan249 | |
| Product leaflet for The S.U. Company's Pressure Pump (Type 'L'). | 26th Sep 1933 | Box 27a \ 2 Scan250 | |
| Suggested modifications to the S.U. Twin Petrol Pump, covering electrical connections, valves, and seatings. | 26th Sep 1933 | Box 27a \ 2 Scan251 | |
| Modifications to a pump casting, base plate, and valve seatings. | 26th Sep 1933 | Box 27a \ 2 Scan252 | |
| Letter to The S.U.Co. regarding modifications to a double petrol pump and the provision of a blueprint. | 27th Sep 1933 | Box 27a \ 2 Scan253 | |
| Requesting the modification of S.U. electric pumps to be used as a spare in France. | 29th Sep 1933 | Box 27a \ 2 Scan254 | |
| Material and assembly improvements for the S.U. Electric Petrol Pump. | 5th Oct 1933 | Box 27a \ 2 Scan255 | |
| Cover note forwarding a copy of a letter addressed to Messrs. S.U. Co. | 9th Oct 1933 | Box 27a \ 2 Scan256 | |
| Letter to The S.U. Company confirming discussion points on pump component modifications. | 7th Oct 1933 | Box 27a \ 2 Scan257 | |
| List of agreed-upon design modifications for various electrical and mechanical components. | 7th Oct 1933 | Box 27a \ 2 Scan258 | |
| List of agreed design modifications for a petrol pump and its related components. | 7th Oct 1933 | Box 27a \ 2 Scan259 | |
| Fixing of vertical suction tubes and the inclusion of a fuse for a pump. | 7th Oct 1933 | Box 27a \ 2 Scan260 | |
| Letter discussing a design modification for a bakelite moulding on a pump body. | 9th Oct 1933 | Box 27a \ 2 Scan261 | |
| Fitting issue with the three-bolt mounting for S.U. petrol pumps and proposing solutions. | 11th Oct 1933 | Box 27a \ 2 Scan262 | |
| Test results for deliveries from S.U. pumps incorporating new casting and valve seatings. | 12th Oct 1933 | Box 27a \ 2 Scan263 | |
| Letter to The S.U. Company requesting pricing for a Twin Pump and jig, and discussing casting patterns. | 13th Oct 1933 | Box 27a \ 2 Scan264 | |
| Inspection and testing procedure for S.U. twin petrol pumps for the 3½ Litre Bentley chassis. | 17th Oct 1933 | Box 27a \ 2 Scan265 | |
| Inspection and testing procedures for electrical components and pump deliveries. | 17th Oct 1933 | Box 27a \ 2 Scan266 | |
| Testing procedures for petrol pumps to check for air and fuel leaks. | 17th Oct 1933 | Box 27a \ 2 Scan267 | |
| Proposal to allow S.U. Co. to supply a standardized Bentley double pump unit to other firms. | 19th Oct 1933 | Box 27a \ 2 Scan268 | |
| Covering memo forwarding copies of letters addressed to Messrs. S.U. Co. | 20th Oct 1933 | Box 27a \ 2 Scan269 | |
| Letter to S.U. Co. proposing modifications to contact covers on Bentley petrol pumps. | 20th Oct 1933 | Box 27a \ 2 Scan270 | |
| Letter from the Chief Designer regarding the submission of a sample pump with agreed modifications. | 20th Oct 1933 | Box 27a \ 2 Scan271 | |
| Price reduction for the Bentley Type S.U. Pump based on increased production volumes. | 21th Oct 1933 | Box 27a \ 2 Scan272 | |
| Performance data and specifications for the S.U. Petrol Pump No. MD.3. | 30th Oct 1933 | Box 27a \ 2 Scan273 | |
| Graph of temperature delivery curves for a twin S.U. petrol pump with different fuels and delivery methods. | 30th Oct 1933 | Box 27a \ 2 Scan274 | |
| Change to a black enamelled finish for S.U. petrol pump castings. | 8th Nov 1933 | Box 27a \ 2 Scan275 | |
| Test report on a petrol pump supplied by the S.U. Co., comparing its performance against an R.R. pump. | 8th Nov 1933 | Box 27a \ 2 Scan276 | |
| Comparing the priming capacity and output of two S.U. petrol pumps under different conditions. | 14th Nov 1933 | Box 27a \ 2 Scan277 | |
| Quality control issues and required improvements for S.U. petrol pumps on the 3½ Litre Bentley Chassis. | 15th Nov 1933 | Box 27a \ 2 Scan278 | |
| Modification to the Bentley petrol tank to prevent fuel surging. | 16th Nov 1933 | Box 27a \ 2 Scan279 | |
| Letter to The S.U. Company requesting modifications to petrol pumps. | 18th Nov 1933 | Box 27a \ 2 Scan280 | |
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