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FJR Motorcycle Forums
Technical & Mechanical Problems
Gravity SUCKS, Pumps PUSH..........
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<blockquote data-quote="Checkswrecks" data-source="post: 299314" data-attributes="member: 3536"><p>With all respect to OhioFJR, vacuum is the method I'd least prefer. I truly do respect that you have a system that is working. However, the least teeny tiny pin-hole anywhere in the system and the fuel supply will prefer to suck air than a liquid. When vacuum systems work, they are great, but troubleshooting them is a learning experience - BTDT. BTW, on hot days, I'd suspect that you're heating your main tank and slightly increasing its pressure, so the reduction in delta-p is why you have trouble drawing from the lower aux tank.</p><p></p><p>Gravity works and the caveats have been covered by guys with experience. The difficulty with getting to your valve is a separate issue and just sounds like the decision of where it was put. Re-locate it to where it's easier to get at and you ought to be past the one real trouble that you mentioned that you've actually had.</p><p></p><p>If you do go with a pump, just remember to have it beneath the level of the fuel in the aux tank (push fuel), or you're back to a vacuum system.</p><p></p><p>Bob</p></blockquote><p></p>
[QUOTE="Checkswrecks, post: 299314, member: 3536"] With all respect to OhioFJR, vacuum is the method I'd least prefer. I truly do respect that you have a system that is working. However, the least teeny tiny pin-hole anywhere in the system and the fuel supply will prefer to suck air than a liquid. When vacuum systems work, they are great, but troubleshooting them is a learning experience - BTDT. BTW, on hot days, I'd suspect that you're heating your main tank and slightly increasing its pressure, so the reduction in delta-p is why you have trouble drawing from the lower aux tank. Gravity works and the caveats have been covered by guys with experience. The difficulty with getting to your valve is a separate issue and just sounds like the decision of where it was put. Re-locate it to where it's easier to get at and you ought to be past the one real trouble that you mentioned that you've actually had. If you do go with a pump, just remember to have it beneath the level of the fuel in the aux tank (push fuel), or you're back to a vacuum system. Bob [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Gravity SUCKS, Pumps PUSH..........
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