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Old 05-09-07, 19:41
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McThor McThor is offline
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Addendum, vacuum fuelpump

Addendum: Added next day regarding the vacuum pump


I left out a picture of the nozzle fitted in the rubber rim. Here it is:












Ok, think I've found a good place for the pump. This is where I've decided to put it. But you can put it wherever you like. It does not matter where or how the pump is placed. Vertical, horizontal, whatever.


I've decided to fit the pump on the airfilter cover. Takes a wee bit of drilling, but nothing fancy. You'll need

2 times 6mmX50mm bolts

6 nuts with washers

That's it .

Position the pump on the cover to the desired place. The picture shows where I have put it, but you should put it as close to the bottom right as you possibly can. If you place it like shown on the picture, you will need to trim the edge of your sidepanels to make room for the pump. Mark the holes with a pencil or the point of a drill.








Drill the two 6mm holes and put in the screws and tighten them with a nut and a washer.






Mount the pump using the nuts and washers, placed like this








And finally, put the cover on and trim the hoses to your needs. You will notice now why I suggest you place the pump as close to the bottom right corner of the airfilter cover as possible. In my case, I had to trim the sidepanel because I put the pump too high. But I think it came out allright afterall. But I do dislike making ireversable mods to the bike, so I suggest you learn from my mistake. Or simply place the pump an entirely different place. Up to you.




And full view. I don't think the pump stands out too much. I guess you could substitute the grey/silver hoses with some black ones if you are a real stickler for appearence. Personally, I don't think this looks too bad.








and just to be clear: The topmost nozzle in about the 4 o'clock position, is connected to the extra nozzle moulded under the bottom of the tank. The nozzle at the 6 o'clock position goes out into the T-section, where each end goes onto the nozzle on each side of the tank. The middle one is for the clear hose that goes into the hole you drilled in the rubber rim.

If you look at the back of the pump, you will notice arrows that point away or into the pump. So when in doubt, refer to these arrows if the nozzle pumps out of the pump, or into it. And don't forget to fit some fuelfilters on each nozzle. Never hurts to be safe. This picture is taken on the left side of the tank.








On a final note a word of caution: When starting the engine for the first time with the new tank, I recommend you fill it well up over the internal pump. The vacuum pump operates per stroke the cylinder performs. If you are low on fuel, the fuel will need to be pumped aaaaall the way through the empty hoses, through the empty vacuum pump, and then aaaaall the way up into the main tank. You may need to ignite the starte for a very long time before enough fuel is pumped up. It's quite logical realy. Each time the cylinder moves, a vacuum is created. With the starter, I'm guessing your engine is running at about 4-500 RPM, as opposed to 4-5000 RPM under normal operating conditions. Basically, your pump works about 10 times faster/better when the engine is running. This is only a problem when you are starting on an empty system. Once it's pumped through, the starter should have no problem supplying the fuel you need at startup.



Well, as the man said "When all is said and done, there's nothing left to say or do". Enjoy.

Last edited by McThor; 05-09-07 at 19:48.