onesea Posted March 16, 2021 Share Posted March 16, 2021 Any reason it should not be silicon vacuum hose? For a long whilst one of the gremlins in a Triumph Trophies fuelling system has been the vacuum hose. Traditionally it runs between #3 Carb and the Peticock valve on the fuel tank. The attachment to the valve is not a great design. Attach hose and straight into 90 Deg turn around frame. Replacements are available at £25 each after afew years they all go same way perished. This time I have spent afew pounds on a length of 3mm Silicone vacuum hose. Will it stay rigid at temperature? Quote Link to comment Share on other sites More sharing options...
Mr Fro Posted March 16, 2021 Share Posted March 16, 2021 Yeah, that's one of the handy properties of silicone. The down side is that it swells badly when exposed to fuel or fuel vapour. 1 Quote Link to comment Share on other sites More sharing options...
Mississippi Bullfrog Posted March 16, 2021 Share Posted March 16, 2021 Get yourself some model aircraft fuel tube. Thick walled silicone that works great as a vacuum hose and won't be affected by fuel. 1 Quote Link to comment Share on other sites More sharing options...
Stu Posted March 16, 2021 Share Posted March 16, 2021 It wouldn't matter if it stayed rigid or not as once its vacuumed if it collapses then it will stay vacuumed and the fuel tap should stay open anyway Quote Link to comment Share on other sites More sharing options...
Trooper74 Posted March 16, 2021 Share Posted March 16, 2021 You will need a fluro silicone lined hose for use with petrol. It will also have to have a steel wire helix embedded between the layers to prevent collapse due to vacuum or have a wall thickness equlivent to the bore for the same reasons. Very specialist, quite expensive .... I can supply it .... but it would be made to order. Minimum 10 metres .... Stick with Nitrile ... possibly Viton Quote Link to comment Share on other sites More sharing options...
Mickly Posted March 16, 2021 Share Posted March 16, 2021 The Trophy Cafe racer I’m working on does away with a vac tap & just has a on / off / res I’ve blanked off the vac hose. It’s an option ? Quote Link to comment Share on other sites More sharing options...
husoi Posted March 17, 2021 Share Posted March 17, 2021 I quite like the stuff from merlin motorsport https://www.merlinmotorsport.co.uk/ Not the cheapest but top quality Quote Link to comment Share on other sites More sharing options...
Trooper74 Posted March 17, 2021 Share Posted March 17, 2021 2 hours ago, husoi said: I quite like the stuff from merlin motorsport https://www.merlinmotorsport.co.uk/ Not the cheapest but top quality Indian quality, but not fuel proof... 1 Quote Link to comment Share on other sites More sharing options...
Mississippi Bullfrog Posted March 17, 2021 Share Posted March 17, 2021 https://www.sussex-model-centre.co.uk/accessories/engine-accessories/fuel-tubing Used this stuff for years, much better than the usual hose fitted. Quote Link to comment Share on other sites More sharing options...
Trooper74 Posted March 17, 2021 Share Posted March 17, 2021 (edited) 6 hours ago, Mississippi Bullfrog said: https://www.sussex-model-centre.co.uk/accessories/engine-accessories/fuel-tubing Used this stuff for years, much better than the usual hose fitted. Used it with petrol ?? Or methanol ..? Edited March 17, 2021 by Trooper74 Quote Link to comment Share on other sites More sharing options...
Mississippi Bullfrog Posted March 17, 2021 Share Posted March 17, 2021 2 hours ago, Trooper74 said: Used it with petrol ?? Or methanol ..? Both. You can buy fuel tube for glow motors or larger petrol engines. Quote Link to comment Share on other sites More sharing options...
fastbob Posted March 21, 2021 Share Posted March 21, 2021 This should be interesting then . Quote Link to comment Share on other sites More sharing options...
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