AndyT
Member
I though some of you might be interested in a clean looking 2nd fuel tank solution. You also don't have to modify your stock tank by drilling holes in it. Here it is:
I found a used Goped 1.5L (50 oz) fuel tank, and came up with a simple mounting solution. You will need a Goped tank, a Goped tank mounting kit, and a piece of thin aluminum stock from your local hardware.
Parts List:
Goped 1.5L Tank Kit - This kit comes with fuel lines and filter attached (lines need to be 24" long), mounting hardware and a cap. http://www.davesmotors.com/s.nl/c.885035/n.1/it.A/id.4182/.f
One Fuel Line Fitting (get at least 2, just in case) http://www.davesmotors.com/s.nl/c.885035/n.1/it.A/id.2559/.f
Optional Stainless Hardware Kit http://adaracing.com/scooter/gas-tank-hardware-kit/gpt-hwk
Optional Tank Cover http://www.davesmotors.com/s.nl/c.885035/n.1/it.A/id.4397/.f
1/16" Thick x 3/4" Wide x 10" Long 6061 Aluminum Stock
Automotive Silicone Seal (black preferred)
To make the lower mount:
Cut 2 pieces of the aluminum stock 3.5" long. I used some metal cutting shears for a clean cut. If the metal bends or curls, you can lightly hammer it back flat.
Drill two 1/4" diameter holes through both pieces 2.5" apart. Make sure that your holes line up, or it will be difficult to install. I used a vise to hold them together while drilling.
Remove all sharp edges.
Your lower mount is now finished.
To mount the Goped tank to to your GEBE kit:
You will need to drill one 15/64" (1/4" is OK) diameter hole in your GEBE lower mount strap for the top tank mounting point. The GEBE lower mount strap is hard steel, so drilling will take a while. I used a hand drill, and put a drop of oil on the drill every minute or so to keep it lubricated while drilling. This will keep it from getting dull. To get the drill started, you can use a smaller drill (1/8" should be fine) to start the hole in the spot where you want to drill. The larger drill will move around when you try start the hole. Be careful, and go slow.
Mount the tank using the lower mount you made, and the mounting hardware supplied in the kit, before you drill the top mounting hole. The 2 aluminum pieces go on either side of the GEBE lower mount strap (see pic). They will "pinch" the steel strap and hold the tank in place. Keep it loose enough that you can move it up and down to find the best tank position. You could end up with a problem if you don't find the right mounting position. Put the cap on the Goped tank so you don't get metal chips in it while drilling
I drilled my hole about 6.5" up from the center line of the axle. You will need to make sure that you place this hole at the proper height for your engine and mounting position. For example, if I had my tank mounted level at the bottom instead of "up and down", I may have had to put the hole lower, so the tank would sit lower. Put some thought into this, as you can end up with the tank too close to your engine, making it hard, or impossible to fill. My tank is mounted just a little too high for my Tanaka 33. I can fill it using a gas container with a flexible hose, so it works OK for me. If you mount your tank lower, be sure that the lower bracket you just made will clear your frame.
The 50 oz Goped tank and your stock tank should give you over 70 ounces of fuel. 64 ounces is a half gallon. This could give you a range of about 80 miles with a Tanaka 33 and even more with a Subaru.
The fuel lines should be set up as follows:
Remove the return line and the black grommet from your stock tank. It's the shorter line that dumps gas back into your tank when you push the primer bulb.
Leave the fuel line that goes to the bottom of your stock tank, with the filter attached to it, as is. Your carb will be drawing fuel the same way it did before.
Attach the YELLOW line from the Goped tank to the fuel return fitting on the carb. Your fuel will return to the Goped tank now.
Place a fuel line fitting (shown in the parts list above) into the end of the BLUE fuel line from the Goped tank. Be sure it's completely inside the line, about 3/16"- 1/4" from the end. You may need to put some rubbing alcohol on the fitting it to get it to slide in. If you used the alcohol, let it dry for a while so the fitting doesn't move on you. If you are drinking alcohol, sleep it off and finish the job tomorrow. Carefully push the BLUE fuel line into the open hole on your stock tank until one end fuel line fitting goes into the tank. You will leave one end of the fitting showing (see pic). No grommet is needed, as you will have a good seal this way. Fuel will be now sucked from the Goped tank to your stock tank as you ride.
What must be done with your Gas Caps:
You must seal the small vent hole on your stock tank. First clean the top of your cap with rubbing alcohol. Grab your silicone seal, and place a small bead over the vent hole on the outside of the cap (see pic). After it dries overnight, you will have a good seal.
The cap on the Goped tank stays as is, and will now vent your fuel system.
Note: The lower tank mount that you made is adjustable, so you can mount the Goped tank level, even if your GEBE lower mount strap leans foprward or backward a bit. Leave the 3 bolts for the lower mount a bit loose. position your new tank how you want it, tighten the top mount, then tighten the lower mount. Tighten the 3 mounting nuts enough to hold the tank in place, but do not over tighten them, as you could damage the tank. Ifyou have a torque wrench, 5 ft lbs (or 10 newton meters) should be more than enough.
Note: TerraPilot mentions below that the Subaru gas cap is vented differently. See his note a few posts below. Thanks!
Finished Installation
Goped 1.5L (50 oz) Tank
Installed Tank, Showing Mounting Bracket
Sealed Vent on Stock Tanaka PF33 Fuel Cap (See note below for Subaru)
Fuel Line Attachment
BLUE fuel Line installed in stock tank - IMPORTANT: Note the fuel fitting inside the fuel line
Fuel line routing: Lines run from the back of the GEBE lower mount strap, under engine, then up to carb and tank. Your installation may be different, and you may need to cut your fuel lines for a neat installation. Route your lines completely before cutting off any excess. Be careful not to expose the lines to excess heat, and keep them away from your spokes. When using wire ties, use as little pressure as possible to prevent pinching your fuel lines.
My GEBE Setup. It's a great riding bike, and it all works excellent!
I found a used Goped 1.5L (50 oz) fuel tank, and came up with a simple mounting solution. You will need a Goped tank, a Goped tank mounting kit, and a piece of thin aluminum stock from your local hardware.
Parts List:
Goped 1.5L Tank Kit - This kit comes with fuel lines and filter attached (lines need to be 24" long), mounting hardware and a cap. http://www.davesmotors.com/s.nl/c.885035/n.1/it.A/id.4182/.f
One Fuel Line Fitting (get at least 2, just in case) http://www.davesmotors.com/s.nl/c.885035/n.1/it.A/id.2559/.f
Optional Stainless Hardware Kit http://adaracing.com/scooter/gas-tank-hardware-kit/gpt-hwk
Optional Tank Cover http://www.davesmotors.com/s.nl/c.885035/n.1/it.A/id.4397/.f
1/16" Thick x 3/4" Wide x 10" Long 6061 Aluminum Stock
Automotive Silicone Seal (black preferred)
To make the lower mount:
Cut 2 pieces of the aluminum stock 3.5" long. I used some metal cutting shears for a clean cut. If the metal bends or curls, you can lightly hammer it back flat.
Drill two 1/4" diameter holes through both pieces 2.5" apart. Make sure that your holes line up, or it will be difficult to install. I used a vise to hold them together while drilling.
Remove all sharp edges.
Your lower mount is now finished.
To mount the Goped tank to to your GEBE kit:
You will need to drill one 15/64" (1/4" is OK) diameter hole in your GEBE lower mount strap for the top tank mounting point. The GEBE lower mount strap is hard steel, so drilling will take a while. I used a hand drill, and put a drop of oil on the drill every minute or so to keep it lubricated while drilling. This will keep it from getting dull. To get the drill started, you can use a smaller drill (1/8" should be fine) to start the hole in the spot where you want to drill. The larger drill will move around when you try start the hole. Be careful, and go slow.
Mount the tank using the lower mount you made, and the mounting hardware supplied in the kit, before you drill the top mounting hole. The 2 aluminum pieces go on either side of the GEBE lower mount strap (see pic). They will "pinch" the steel strap and hold the tank in place. Keep it loose enough that you can move it up and down to find the best tank position. You could end up with a problem if you don't find the right mounting position. Put the cap on the Goped tank so you don't get metal chips in it while drilling
I drilled my hole about 6.5" up from the center line of the axle. You will need to make sure that you place this hole at the proper height for your engine and mounting position. For example, if I had my tank mounted level at the bottom instead of "up and down", I may have had to put the hole lower, so the tank would sit lower. Put some thought into this, as you can end up with the tank too close to your engine, making it hard, or impossible to fill. My tank is mounted just a little too high for my Tanaka 33. I can fill it using a gas container with a flexible hose, so it works OK for me. If you mount your tank lower, be sure that the lower bracket you just made will clear your frame.
The 50 oz Goped tank and your stock tank should give you over 70 ounces of fuel. 64 ounces is a half gallon. This could give you a range of about 80 miles with a Tanaka 33 and even more with a Subaru.
The fuel lines should be set up as follows:
Remove the return line and the black grommet from your stock tank. It's the shorter line that dumps gas back into your tank when you push the primer bulb.
Leave the fuel line that goes to the bottom of your stock tank, with the filter attached to it, as is. Your carb will be drawing fuel the same way it did before.
Attach the YELLOW line from the Goped tank to the fuel return fitting on the carb. Your fuel will return to the Goped tank now.
Place a fuel line fitting (shown in the parts list above) into the end of the BLUE fuel line from the Goped tank. Be sure it's completely inside the line, about 3/16"- 1/4" from the end. You may need to put some rubbing alcohol on the fitting it to get it to slide in. If you used the alcohol, let it dry for a while so the fitting doesn't move on you. If you are drinking alcohol, sleep it off and finish the job tomorrow. Carefully push the BLUE fuel line into the open hole on your stock tank until one end fuel line fitting goes into the tank. You will leave one end of the fitting showing (see pic). No grommet is needed, as you will have a good seal this way. Fuel will be now sucked from the Goped tank to your stock tank as you ride.
What must be done with your Gas Caps:
You must seal the small vent hole on your stock tank. First clean the top of your cap with rubbing alcohol. Grab your silicone seal, and place a small bead over the vent hole on the outside of the cap (see pic). After it dries overnight, you will have a good seal.
The cap on the Goped tank stays as is, and will now vent your fuel system.
Note: The lower tank mount that you made is adjustable, so you can mount the Goped tank level, even if your GEBE lower mount strap leans foprward or backward a bit. Leave the 3 bolts for the lower mount a bit loose. position your new tank how you want it, tighten the top mount, then tighten the lower mount. Tighten the 3 mounting nuts enough to hold the tank in place, but do not over tighten them, as you could damage the tank. Ifyou have a torque wrench, 5 ft lbs (or 10 newton meters) should be more than enough.
Note: TerraPilot mentions below that the Subaru gas cap is vented differently. See his note a few posts below. Thanks!
Finished Installation
Goped 1.5L (50 oz) Tank
Installed Tank, Showing Mounting Bracket
Sealed Vent on Stock Tanaka PF33 Fuel Cap (See note below for Subaru)
Fuel Line Attachment
BLUE fuel Line installed in stock tank - IMPORTANT: Note the fuel fitting inside the fuel line
Fuel line routing: Lines run from the back of the GEBE lower mount strap, under engine, then up to carb and tank. Your installation may be different, and you may need to cut your fuel lines for a neat installation. Route your lines completely before cutting off any excess. Be careful not to expose the lines to excess heat, and keep them away from your spokes. When using wire ties, use as little pressure as possible to prevent pinching your fuel lines.
My GEBE Setup. It's a great riding bike, and it all works excellent!
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