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FJR Motorcycle Forums
Technical & Mechanical Problems
2018 FJR AUX Tank Plumbing
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<blockquote data-quote="Canadian FJR" data-source="post: 1428735" data-attributes="member: 1223"><p>What size fuel - 5/16 (7.9mm) ??</p><p></p><p>——————</p><p></p><p>Also, I found these comments on the IB forum;</p><p></p><p>When both tanks are full and you ride away from the gas station the fuel is pumped out of the bike tank by the fuel pump. That sucks fuel from the aux straight into the bike tank litre for litre. At the same time air is drawn (litre for litre) into the aux vent line from outside. Once the aux is empty the bike tank starts drawing in air straight through the aux.The filling procedure is strict. Starting with the aux empty (it was empty in your shed) first fill the bike tank and put the cap on. Fill the aux and put the cap on. Do not open the bike tank unless you are positive the aux is empty - otherwise fuel will pour out the moment you open the cap. Do not fill the aux unless you are positive the bike tank is full. Otherwise you may create a vapour lock as there is a big bubble of air at the top of the bike tank. That air can't get out and the aux fuel can't easily get in. If the bike seems to be starved of fuel out on the road when you know you have gallons on board this is the likely cause. Carefully open the bike cap and you will hear air hissing. Wait a bit and the fuel from the aux will start to flow and fill the bike tank to the top. Cap it before it overflows.</p><p> </p><p></p><p>I can see situations where I’d just fill one or the other tank without filling the other.</p><p></p><p>Canadian FJR</p></blockquote><p></p>
[QUOTE="Canadian FJR, post: 1428735, member: 1223"] What size fuel - 5/16 (7.9mm) ?? —————— Also, I found these comments on the IB forum; When both tanks are full and you ride away from the gas station the fuel is pumped out of the bike tank by the fuel pump. That sucks fuel from the aux straight into the bike tank litre for litre. At the same time air is drawn (litre for litre) into the aux vent line from outside. Once the aux is empty the bike tank starts drawing in air straight through the aux.The filling procedure is strict. Starting with the aux empty (it was empty in your shed) first fill the bike tank and put the cap on. Fill the aux and put the cap on. Do not open the bike tank unless you are positive the aux is empty - otherwise fuel will pour out the moment you open the cap. Do not fill the aux unless you are positive the bike tank is full. Otherwise you may create a vapour lock as there is a big bubble of air at the top of the bike tank. That air can't get out and the aux fuel can't easily get in. If the bike seems to be starved of fuel out on the road when you know you have gallons on board this is the likely cause. Carefully open the bike cap and you will hear air hissing. Wait a bit and the fuel from the aux will start to flow and fill the bike tank to the top. Cap it before it overflows. I can see situations where I’d just fill one or the other tank without filling the other. Canadian FJR [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
2018 FJR AUX Tank Plumbing
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