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Old 12-18-2006, 09:01 PM   #1
enigmas
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Fuel tank top removal

Hey guys has anyone removed the large lid on the underseat tank. I don't have the "Harley tool" so what are the alternative ways?
Any problems encountered when either removing or refitting the lid?
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Old 12-18-2006, 09:03 PM   #2
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Try this link. Step by step instructions on how to do it. Good luck!
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Old 12-18-2006, 09:21 PM   #3
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You can also go and buy one from Max in the forum store.

http://www.v-rodforums.com/?page=v-rodstore
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Old 12-18-2006, 11:29 PM   #4
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That's an even better idea!!!
Nice one, Mike!
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Old 12-19-2006, 06:31 AM   #5
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Thanks guys for the links to the tool...looks like a simple tool to make. Good one RustyG you've obviously worked on a farm at some time.

My interest in this is in relation to building an auxilliary tank that can be removed when not needed. I've seen quite a few on the forum fitted to the rear racks of the Rod. Most seem to flow fuel through the breather line when the tank is near empty and this is done manually at the rider's discretion. The down side to this seems to be that the breather line is only 1/4" and now has the duel function of venting air and delivering fuel. From my reading, this at times causes tank pressure build up and/or an inadequate delivery of fuel to the engine if the scoot is being ridden hard.

I'm planning to fit a larger dedicated fuel feed from the auxilliary tank to the main underseat tank and control the flow of fuel to the main tank with a fuel float mechanism as found in a suitable donor carburettor (using a "vertical" cut off needle and seat), this may be mounted on the side of the tank down a bit from the top allowing air space for expansion. Briefly, much the same as your toilet float works (at least "down under".)

In this way the main tank can be filled, then the auxilliary. The float mechanism in the main tank cuts fuel flow until the float level drops below a predetermined level, it then tops it up automatically until the auxilliary tank is exhausted of fuel.

This is the plan.
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Old 12-19-2006, 07:15 AM   #6
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Quote:
Originally Posted by enigmas
Thanks guys for the links to the tool...looks like a simple tool to make. Good one RustyG you've obviously worked on a farm at some time.

My interest in this is in relation to building an auxilliary tank that can be removed when not needed. I've seen quite a few on the forum fitted to the rear racks of the Rod. Most seem to flow fuel through the breather line when the tank is near empty and this is done manually at the rider's discretion. The down side to this seems to be that the breather line is only 1/4" and now has the duel function of venting air and delivering fuel. From my reading, this at times causes tank pressure build up and/or an inadequate delivery of fuel to the engine if the scoot is being ridden hard.

I'm planning to fit a larger dedicated fuel feed from the auxilliary tank to the main underseat tank and control the flow of fuel to the main tank with a fuel float mechanism as found in a suitable donor carburettor (using a "vertical" cut off needle and seat), this may be mounted on the side of the tank down a bit from the top allowing air space for expansion. Briefly, much the same as your toilet float works (at least "down under".)

In this way the main tank can be filled, then the auxilliary. The float mechanism in the main tank cuts fuel flow until the float level drops below a predetermined level, it then tops it up automatically until the auxilliary tank is exhausted of fuel.

This is the plan.
I hate to say it but it sounds a little over engineered to me. Why not just put your feed line in the side of the tank with seals about 6 inches below the top of the tank, this would keep the feed line from flowing until the tank dropped to a given level without the need for any mechanical devices. Remember if the needle and seat your talking about got stuck it would fill the tank to the point of running fuel out the vent on you while riding or even worse while sitting in your garage. You could also run a tube down from the top to a given point that would do the same thing without the need for a needle or seat.
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Old 12-19-2006, 08:45 AM   #7
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Hi Max, how do you figure that? Since the feed line is still below the auxilliary tank, fuel would just flow into the seat tank till it's volume was completely filled something I'm trying to avoid. Needle and seats worked for cars and other vehicles for generations...it just depends upon the type used. The reason for the vertical needle & seat is that they are less likely to malfunction than a horizontal type. It would be easy enough to fit in a petrol shutoff valve (eg. dual fuel cars) when the ignition was switched on or off.
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Old 12-19-2006, 08:51 AM   #8
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Quote:
Originally Posted by enigmas
Hi Max, how do you figure that? Since the feed line is still below the auxilliary tank, fuel would just flow into the seat tank till it's volume was completely filled something I'm trying to avoid. Needle and seats worked for cars and other vehicles for generations...it just depends upon the type used. The reason for the vertical needle & seat is that they are less likely to malfunction than a horizontal type. It would be easy enough to fit in a petrol shutoff valve (eg. dual fuel cars) when the ignition was switched on or off.
What I'm saying is no valve is needed at all. I know needles and seats have been used for years, believe me I have worked on many over 30 years that have failed for one reason or another. Why complicate such a simple system is all I was asking. You can use gravity and regular flow to control this without any valve or switch at all. It makes no sense to me to complicate the issue. IMHO
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Old 12-19-2006, 10:09 PM   #9
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Sounds pretty dangerous to to me to ride around with a gas container on your bike anyway. I'm with Max no need for any valves as long as you run your existing(lower)gas tank vent higher then the top of the upper tank you can just fill her up and wait to get a reading on your gas gauge.
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