AndrewP Posted November 20, 2018 Report Share Posted November 20, 2018 Hi Everyone, I have a small fuel leak at the junction of the fuel pump outlet and compression fitting on the Lucas Fuel pump. Does anyone happen to know the size so I can source locally? Im hopeful that someone has jotted the size down when they replaced theirs. Thanks Andrew Quote Link to post Share on other sites
AndrewP Posted November 22, 2018 Author Report Share Posted November 22, 2018 Ok..for those playing at home I'll answer my own question. The union needs a 1/4" BSP self centring bonded washer (or dowty seal). Hopefully that will solve my fuel smell in the boot (already have the barricade lines everywhere) Quote Link to post Share on other sites
foster461 Posted November 22, 2018 Report Share Posted November 22, 2018 Everyone must have converted to Bosch Andrew. I had never heard of a dowty seal but now I know what it is. Stan Quote Link to post Share on other sites
BlueTR3A-5EKT Posted November 22, 2018 Report Share Posted November 22, 2018 9 hours ago, AndrewP said: Ok..for those playing at home I'll answer my own question. The union needs a 1/4" BSP self centring bonded washer (or dowty seal). Hopefully that will solve my fuel smell in the boot (already have the barricade lines everywhere) Stockists in your hemisphere..... http://www.sealsolutionsaustralia.com.au/product/dowty-sealsbonded-washers/ From this chart it looks like you want size 021 1/2" hole is 1/4 BSP according to chart. https://www.sealingaustralia.com.au/bonded-washers/ Cheers Peter W Quote Link to post Share on other sites
Charlie D Posted November 22, 2018 Report Share Posted November 22, 2018 Peter, I only discovered “Dowty seals” about a year ago. (Not actually used them yet.) Would you say that they are OK to use anywhere that an original copper washer was used? My particular problem is with a 3A master cylinder reservoir, where the unions come out of the bottom. I can see other places (hose into clutch slave?) where they may be a good idea to use. Interested in your comments on the matter. Charlie D Quote Link to post Share on other sites
Waldi Posted November 22, 2018 Report Share Posted November 22, 2018 Charlie, make sure the rubber of the seals is compatible with the brake fluid you use. Waldi Quote Link to post Share on other sites
stuart Posted November 22, 2018 Report Share Posted November 22, 2018 4 hours ago, Charlie D said: Peter, I only discovered “Dowty seals” about a year ago. (Not actually used them yet.) Would you say that they are OK to use anywhere that an original copper washer was used? My particular problem is with a 3A master cylinder reservoir, where the unions come out of the bottom. I can see other places (hose into clutch slave?) where they may be a good idea to use. Interested in your comments on the matter. Charlie D TBH you would probably be better of replacing the tank with a new one with the improved seal in the top and brake fluid impervious paint. Stuart. Quote Link to post Share on other sites
Charlie D Posted November 23, 2018 Report Share Posted November 23, 2018 Thanks Waldi, Didn’t think of that. I will research before I try them. Stuart, in an ideal world where I had more money I’d do that. I know we are not talking a lot of money, but there are so many things that I could replace that are “Not a lot of money” individually. In the end they all add up to many hundreds of pounds (Which I don’t have to spare.) Charlie. Quote Link to post Share on other sites
astontr6 Posted November 23, 2018 Report Share Posted November 23, 2018 17 hours ago, stuart said: TBH you would probably be better of replacing the tank with a new one with the improved seal in the top and brake fluid impervious paint. Stuart. I have used Dow seals as they were originally known as for years! Lucas used them on their PI System in the 1970s and when I was a buyer I bought 1000s of them for inclusion into OEM Gasket Sets as they were listed on the OEM's parts list. Provided that the rubber compound is Nitrile as a minimum, Viton preferred, I would have no hesitation in using them on my TR6 and have done for over 40 years with out problems. They are better than copper washers in problem leak areas. Bruce.. Quote Link to post Share on other sites
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