Tuesday, 16 March 2021

Fuel hose

 When I watched the Netflix documentary "Black Fish" I was darkly amused to find out just how naughty a disgruntled killer whale can be - it will bite and drown its keepers.

The family lawnmower turned just as malevolent last week when it tried to set me on fire. It leaked a good quantity of petrol onto the bottom of my jeans, but thankfully it didn't manage to set light to it. I barely remember it, but I think the fuel cock was replaced in the 80s. The replacement either came from the chandlers or my dad's stock of parts. Either way it has a bore and a flow rate more suited to an ocean-going vessel and I think it's made of bronze. The spigot is stubby, larger than 5/16 and doesn't have a lead or ring-barbs. The original carburettor had a 5/16 spigot and an integral filter gauze. You could just make the connection with a length of 5/16 fuel hose if you warmed it up and stretched it over the fuel cock. I changed the carburettor last year and the new one has a 6mm spigot pointing in the wrong direction and no filter. Last year I used a length of rubber hose, some elbows and an inline filter from a Chinese dirt bike. This year the hose had got so brittle that it leaked around every joint and spilled a load of petrol onto my trousers.

This lawnmower has become a superstition to me and a labour of love so I have spent a good bit of time, effort and money on the fuel feed system. There's now a short length of 5/16 hose going into a nylon 8mm->6mm reducing elbow, then a length of genuine tygon 1/4 hose, then a low displacement filter with a sintered brass ball mesh, then another length of tygon, then another elbow then tygon into the carb. The whole thing doesn't hold much more than a teaspoon of fuel and it's all bone dry on the outside.



Richard "no smoking" B


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