Ian Cooper Posted November 15, 2022 Report Share Posted November 15, 2022 Hi all. Just a quick ask please. I'm looking to replace the standard fuel pump (gaskets and olives would be good too) on my MK2 GT6 and wondered if anyone can recommend the best supplier, and that includes 'Rimmers' if you think they may be offering the best, though I know they won't be the cheapest! Or maybe a supplier to avoid like the plague, all advice welcome. Cheers folks, and may I be the first to wish you all a Merry 🎄 Link to comment Share on other sites More sharing options...
Paul H Posted November 15, 2022 Report Share Posted November 15, 2022 Canleys get my vote Paul Link to comment Share on other sites More sharing options...
johny Posted November 15, 2022 Report Share Posted November 15, 2022 Hi, fuel pumps like many components for our cars these days have limited demand so there tends to be just one or two non original companies making them quite often in places where labour is cheapest. This improves availability and cost but means all UK suppliers stock the same items although they will of course each charge different prices. The downside is that manufacturing quality control can be lacking and obviously with this supply situation it can affect an item no matter where you get it from. In the end it comes down to which suppliers might handle problems best weighed against their prices and in my case its the latter that wins everytime... Link to comment Share on other sites More sharing options...
Pete Lewis Posted November 15, 2022 Report Share Posted November 15, 2022 +1 for Canley classics as there are so many problems with replacement pumps producing excessive pressure its worth fitting a gauge in line to check what the output is we dont have a list of rogue pumps and many suppliers supply each other which is where the price hikes can come from as all want a share of the mark up if you end up with flooding the cures range from adding more gaskets to reducing the spring length 2.5psi is about right 3.5+ will overload the float needles Pete Link to comment Share on other sites More sharing options...
Dick Twitchen Posted November 15, 2022 Report Share Posted November 15, 2022 2 hours ago, Pete Lewis said: +1 for Canley classics +2, and my new one from them works fine. Dick Link to comment Share on other sites More sharing options...
Jeffds1360 Posted November 15, 2022 Report Share Posted November 15, 2022 At least Rimmers send you a second, free pump if you complain about the pressure! I now have 2 spare as I fixed the original both push about 5psi. Link to comment Share on other sites More sharing options...
Wagger Posted November 15, 2022 Report Share Posted November 15, 2022 Do a search on this section for "fuel pumps" and read what we all have experienced. I ended up replacing the valves in the original glass bowl one. You can see what is going on with that version. There is a low pressure electric pump mad by Huco, but you should fit a safety device to shut fuel off if you have an accident should you choose that solution. Mechanical pumps stop when the engine does. Electric ones do not. Having stated that, the Morris Minor and most BMC cars used electric pumps with no such safety device. Link to comment Share on other sites More sharing options...
PeteH Posted November 16, 2022 Report Share Posted November 16, 2022 Chances are this has been covered before?, But in my mind the issue of overpressure on the AC type mechanical pumps would be down to the Spring rate?. The induction of fuel is made when the Diaphragm is drawn down, the spring ensures the return. A "weaker" spring would / should lead to less pressure? or am I oversimplifying?. Reducing the stroke would merely reduce the volume of fuel. Pete Link to comment Share on other sites More sharing options...
johny Posted November 16, 2022 Report Share Posted November 16, 2022 I think its both because any spring needs increasing force to progressively compress further so if the fuel pump's is only compressed a little by the cam and lever logically when released it will apply a lower force to whatever is resisting it (in this case fuel and the float valves).... Link to comment Share on other sites More sharing options...
NonMember Posted November 16, 2022 Report Share Posted November 16, 2022 It depends on how sensibly the spring is specified. The sensible option is a weak spring that needs compressing to fit. In that case, the stroke mostly governs the flow and has little effect on pressure. If the spring is stronger but its rest length is the same as the fitted length, then a shorter stroke makes much more difference to the pressure for the reason johny gives. Link to comment Share on other sites More sharing options...
johny Posted November 16, 2022 Report Share Posted November 16, 2022 Yes as I say in the old days when thousands of these pumps were being made it was economical to make a specific spring but now the production is very limited the manufacturer just gets the cheapest off the shelf spring they can find possibly from a washing machine or car seat😭 Link to comment Share on other sites More sharing options...
Gully Posted November 16, 2022 Report Share Posted November 16, 2022 You can simply swap the top half of the pump (which includes the valves) and leave the lever / spring etc assembly on the block. This preserves the original output pressure if you encounter any problems. It's easy to replace the diaphragm at this stage too. Gully Link to comment Share on other sites More sharing options...
Wagger Posted November 16, 2022 Report Share Posted November 16, 2022 Looks like the guys are answering you, but, just search in the Fuel System section for pump and you will find all of the previous info. A bit tedious but loads of us have posted in there. Link to comment Share on other sites More sharing options...
DanMi Posted November 16, 2022 Report Share Posted November 16, 2022 I would rebuild the original if it has the type that is screwed together, rather than a new repro Link to comment Share on other sites More sharing options...
MJH2454 Posted February 8, 2023 Report Share Posted February 8, 2023 On 15/11/2022 at 15:15, Pete Lewis said: +1 for Canley classics as there are so many problems with replacement pumps producing excessive pressure its worth fitting a gauge in line to check what the output is we dont have a list of rogue pumps and many suppliers supply each other which is where the price hikes can come from as all want a share of the mark up if you end up with flooding the cures range from adding more gaskets to reducing the spring length 2.5psi is about right 3.5+ will overload the float needles Pete Adding more gaskets, is there a suggestion as to how many additional gaskets are needed? Link to comment Share on other sites More sharing options...
daverclasper Posted February 8, 2023 Report Share Posted February 8, 2023 56 minutes ago, MJH2454 said: Adding more gaskets, is there a suggestion as to how many additional gaskets are needed? I think I have read to make between 3mm - 5mm?, though no personnal experience Link to comment Share on other sites More sharing options...
johny Posted February 8, 2023 Report Share Posted February 8, 2023 You need to measure the pressure and add gaskets until within the right range as too much and you could get fuel starvation under high demand conditions... Link to comment Share on other sites More sharing options...
Pete Lewis Posted February 8, 2023 Report Share Posted February 8, 2023 yes its a bit trial and error job you might be lucky and twiddling wont be needed aim for 2.5psi or there abouts 4psi will overcome the float needle Pete Link to comment Share on other sites More sharing options...
johny Posted February 8, 2023 Report Share Posted February 8, 2023 Heres the original post Link to comment Share on other sites More sharing options...
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