VTX1800c auxiliary gas tank - Page 2 - VTXOA
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post #11 of 15 (permalink) Old 04-17-2019, 11:54 AM
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For added security, I've got a Shaker Siphon Hose in my saddlebags so I can get a gallon or so.

EDIT: A gallon or so...From My H-D Friends, so we can all make it to the next gas station!!!
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2002 1800 "S"

Last edited by SeaSteve; 04-17-2019 at 03:32 PM.
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post #12 of 15 (permalink) Old 04-17-2019, 12:37 PM
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Originally Posted by SeaSteve View Post
For added security, I've got a Shaker Siphon Hose in my saddlebags so I can get a gallon or so.
Is that a five finger discount credit card hose?
post #13 of 15 (permalink) Old 04-17-2019, 03:21 PM
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I did this with my 'C' and I can tell you it was a bit of a failure. First, I plumbed the aux fuel into the plate the fuel pump is attached to. It took some experimenting, but I got a good seal, no leaks. I JB welded an on/off fuel valve on the flat section of the tank. This valve turned easily and didn't take a lot of stress. Next I bought a bag for the luggage rack in the back to put the tank into. It helped hide it. Plumbed the fuel to a QD pair and I was off.

The failure part. I purchased the tank as a sealed vented tank. That is the tank vented through a vent hole but the tank/cap was supposed to be sealed. Such was not the case and the tank splashed fuel all inside the bag. It was a real mess. The tank vendor really screwed up on that one, and it made the entire venture far less appealing. I added a filter to the outlet of the tank and the fuel flow was far less than ideal. If I had it to do again, I would verify the cap sealing, and I would add a pump, like a transfer pump. That way when you get to 80 or 90 miles, you can just hit the valve and pump and let her go. As it was I only filled the aux tank to about 50% to avoid the splash leaks, and turned on the transfer valve after 10 or 20 miles. This way the aux tank would have more than an hour to slowly drain into my main tank. This worked pretty well, I only wished the aux tank hadn't leaked so bad. If the aux tank cap hadn't leaked so bad I would have added a pump and called it good.

Why did I even start this? Well, the same as you, I wanted to get more range out of the bike. I was riding to Sturgis and we had planned on some back road riding with and expected distance between fuel stops at more than my capability of 130/140 miles. I needed more range and tried this. I did get an extra 1.5 gallons or so, as far as I wanted to fill the splashy leaky tank, so it did serve a purpose. In the end I dismantled the entire affair, and sealed up the hole with a bolt, nut, washers, gasket material and some gas tank sealer (Seal-All). I just wasn't worth all of the mess. If I had it to do over, I would have found a container or containers I could have carried an extra couple of gallons of fuel in and simply stopped and topped up the tank as needed. You can get these that look like water bottles of 1 or 1.5 quarts. Stash a couple or three of these and call it an emergency stash.

The guys I was riding with loved to jab me about the small tank on the Honda, but hey, it is what it is. None ever refused or were upset that we had to stop because I needed fuel. Every stop, they would ask how I was on fuel and had an idea of how far before our next stop. There was me, and a young lady on a Sportster. She had a great sense of humor and we joked about it with each other every stop. At least I had company. On the way down and back it was just us guys, but both were my age and grateful to stop and pee anyway.
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post #14 of 15 (permalink) Old 04-24-2019, 03:29 AM
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I have 2006 VTXc with a 4.8 gal..tank. I average about anywhere between 35-38 mpg. So let's say 36 mpg. equals 170 miles. So fill up at 160 miles. Now I also have a 2002 Honda ST1100 that holds 7.4 gals. I don't have to worry about gassing up until over 300 miles. For a long ride, guess which one I ride, as both bikes are excellent bikes and fun to ride. I remember stopping in Big Sur on the way back from the Laguna Seca race track. Gas was over $5 a gal. I had 160 miles since my last full up, and I just kept on going.
post #15 of 15 (permalink) Old 04-24-2019, 10:05 AM
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If you have the pair removal done you may notice a **** load of space under the tank. this can be remodelled by a reputable custom builder. in England about 1000-1500. you could also go for a full custom tank job again in the UK about 2000 neither is a cheap proposition, but anything else you do is likely to cost more than you imagine. Remodelling your tank does away with anything Heath Robinson you would have to rig to get those miles.
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