raygeorge Posted April 6, 2023 Report Share Posted April 6, 2023 We have a Triumph 1200, Solex Carb which was completely refurbed by Carburettor Exchange (beautiful job) and we then fitted a new petr ol pump from David Manners which is just overwhelming it. There are human analogies! We know why the pump is doing it, but can anyone help with a remedy, short of divorce. e.g. does anyone know where an original pump could be sourced, or an overhauled original to original spec. A Very Happy Easter Ray Link to comment Share on other sites More sharing options...
johny Posted April 6, 2023 Report Share Posted April 6, 2023 In some cases new pumps have to have extra packers installed where the mount on the block so that their operating arm is moved away from the cam. This results in less pump pressure but to get the correct thickness of packer you really need to measure the fuel pressure... Link to comment Share on other sites More sharing options...
Josef Posted April 6, 2023 Report Share Posted April 6, 2023 There’s a few threads on this. Either replacing the spring on the lever in the pump with an original one, or spacing the pump further from the engine are the recommended solutions if I remember correctly. Link to comment Share on other sites More sharing options...
Pete Lewis Posted April 7, 2023 Report Share Posted April 7, 2023 many of the aftermarket copy pumps are well know to produce 6 to 10 psi far more than the float needle valve can cope with we fitted a rimmers pump to a local troubled spitty and it blew fuel from everywhere just hopeless Josef has summed it up use an old pump spring or add packing to space the pump lever way from the block has worked to solve this rubbish parts syndrome you dont need more than 2.5 psi to work correctly there are low pressure hucco electric pumps used by many they are rated as 2.5psi Pete Link to comment Share on other sites More sharing options...
raygeorge Posted April 7, 2023 Author Report Share Posted April 7, 2023 Thanks to you all for replying. Sooo...next question - how to achieve the spacing. Is there are thicker gasket available..... idiot's guide to the solution please! Ray Link to comment Share on other sites More sharing options...
Pete Lewis Posted April 7, 2023 Report Share Posted April 7, 2023 cornflake packets used to work there are plastic spacers not always easy to find the 1500 had along arm pump and a plastic insulating spacer but thats probably too thick then there can be the studs become too short all a bit of a faf when the manufacturer should stick to a basic specification ... not searched on here but seem to remember about 3mm was used to drop the output Pete Link to comment Share on other sites More sharing options...
johny Posted April 7, 2023 Report Share Posted April 7, 2023 Yes or buy more gaskets from the usual suspects? Link to comment Share on other sites More sharing options...
raygeorge Posted April 9, 2023 Author Report Share Posted April 9, 2023 could you identify favourite usual suspects for additional gaskets or extra thick ones (gasket not owner!) Ray Link to comment Share on other sites More sharing options...
johny Posted April 9, 2023 Report Share Posted April 9, 2023 jamespaddock.co.uk have standard gaskets at 20p each. Then theres VAT and postage so best bought as part of a larger order... Link to comment Share on other sites More sharing options...
raygeorge Posted April 10, 2023 Author Report Share Posted April 10, 2023 Thank you all! Can anyone advise how much packing in mm might work to alleviate the problem. I am going to go back to Manners also to see what they say - seems bonkers selling petrol pumps for heralds when they are bound to behave in this way..... Ray Link to comment Share on other sites More sharing options...
johny Posted April 10, 2023 Report Share Posted April 10, 2023 The original workshop manual stated that replacement pumps may need this adjustment to get the pressure right. This is because pumps are made by third parties plus their springs may well weaken over time so the initial pressure they deliver is a bit of an unknown.... Link to comment Share on other sites More sharing options...
Pete Lewis Posted April 10, 2023 Report Share Posted April 10, 2023 its a common problem as sold by so many these days just copies not built to a specification pete Link to comment Share on other sites More sharing options...
daverclasper Posted April 10, 2023 Report Share Posted April 10, 2023 I seem to remember, packing out between 3-5mm? from an old thread? Link to comment Share on other sites More sharing options...
Stratton Jimmer Posted April 11, 2023 Report Share Posted April 11, 2023 20 hours ago, daverclasper said: I seem to remember, packing out between 3-5mm? from an old thread? From a post dated 16 Feb 2022. Posted February 17, 2022 by me in answer to the question "How thick were the gaskets?" Only about 3mm. Self cut gaskets from sheet. Link to comment Share on other sites More sharing options...
Josef Posted April 11, 2023 Report Share Posted April 11, 2023 On 09/04/2023 at 19:00, raygeorge said: could you identify favourite usual suspects for additional gaskets or extra thick ones (gasket not owner!) Ray It’s sort of been mentioned already, but I suggest just making your own gaskets. Either cut out the shape with sharp scissors, or place a piece of gasket material on the relevant surface and gently tap round the edges with a hammer till the gasket sheet breaks away (this method is very satisfying, and will give you exactly the right shape,) 1 Link to comment Share on other sites More sharing options...
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