SuzukiSavage.com - auxilary fuel tank? updated some more

firedawg

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auxilary fuel tank? updated some more
07/22/08 at 08:12:32

Hi all. New to board, new to savage. I just bought my wife an '05 s40/savage for her first bike. I road it to work a few times and love it.
It feels like a toy compared to my bike (VTX1800) but is a blast to ride and gets much better mileage. The problem is the short fuel range, my commute is 110 miles and range is 100 miles. I have in mind to remove the stock air box and install the performance air filter and I thought where the air box is/was would be a great place for an aux. fuel tank. I think I could build a tank that would hold another gallon or so. My problem is this would be lower than the carb so it will not feed by gravity. If I understand the fuel valve correctly, fuel is actually "pumped" through by the vacuum diaphram. So my question is if I allowed the stock tank to feed into the aux. tank by gravity then moved the fuel valve to the lower tank will it pump with sufficient pressure and volume to feed the carb? By the way great forum, I read through it thouroghly before buying. I build most of my own custom parts from scratch and I love to read how others have modified thier bikes.

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« Last Edit: 07/29/08 at 11:34:52 by firedawg »

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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: auxilary fuel tank? Reply #1 - 07/22/08 at 08:24:33 Its gravity to the carb, vacuum is used to open the diaphragm to allow the fuel to flow. No pumpy action.
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firedawg YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 12 Mid Michigan Gender:	Re: auxilary fuel tank? Reply #2 - 07/22/08 at 08:28:17 Thanks for the help. Maybe I could find a small electric pump.
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Moofed Full Member Alliance Member Offline ...and the engine just gleams... Posts: 148 Bloomington, Indiana Gender:	Re: auxilary fuel tank? Reply #3 - 07/22/08 at 08:43:12 Is it 100 miles until you hit the reserve? If so, then the tank should have about another half gallon or 25 miles in it. If not, then you ought to be getting better mileage from the Savage.
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firedawg YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 12 Mid Michigan Gender:	Re: auxilary fuel tank? Reply #4 - 07/22/08 at 08:53:45 Yes 100 miles to reserve. I'm just used to more plus I can't make it round trip to my favorite (cheapest) gas station . I found out I can get a mikuni vacuum operated pump like from a snowmobile on ebay for around $20 which makes building the tank the hardest part of this job .
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buttgoat1

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Re: auxilary fuel tank?
Reply #5 - 07/22/08 at 09:36:00

We have been having the great tank expansion wants for a while.

I thought of that too, I have a gas golf cart with a vacuum pump.

I figure that a low mounted tank with a pump would do it. Put a tee into the gas line above the fuel filter (good idea if you havent done it already) and a valve in the vacuum line.
When you hit reserve, open up the valve allowing the vacuum to actuate the pump. It should actually refill the gas tank with the excess fuel the carb doesnt need. Then just close the vacuum valve again.

you would also need a check valve so the main tank would not overfill the aux tank.

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firedawg YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 12 Mid Michigan Gender:	Re: auxilary fuel tank? Reply #6 - 07/22/08 at 09:51:00 Buttgoat (whats with that name?) sounds good but more complicated than I have in mind. I'm thinking of running fuel line from the stock fuel valve (set to prime) to the top of the aux. tank, then installing another fuel valve in the bottom of the aux. tank to the pump.
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verslagen1 YaBB Moderator ModSquad Offline Where there's a will, I want to be in it. Posts: 29042 L.A. California Gender:	Re: auxilary fuel tank? Reply #7 - 07/22/08 at 11:45:45 I've thought of the same thing, but didn't find the vac op pump. Look at oil reservoir tanks. There was a clear sided one, but everyone wanted to put something else in there. And I would think the best way to go about it would be to refill the stock tank after you've run it to reserve. Then turn on the pump and drain the reserve.
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mpescatori

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Re: auxilary fuel tank?
Reply #8 - 07/23/08 at 00:51:22

1st question that springs to mind, what's your cruising speed?
Chances are, fitting a small fly screen and/or cruising a mere 5mph slower will improve your mpg.

2nd question, tire size? If you're in for a new rear tire, try a slightly oversize tire, a 3-5% increase in rolling radius will improve your mpg by just as much.

3rd question, have you considered a HD oil tank fitted to the handlebars?
I had come across a website (I think it's the same that advertise a $350 chromed springer front end) KCINT.COM that sell steel chromed cylindrical oil tanks, if they have a crew top and you fit a petc0ck you could easily have those extra half gallon you're looking for...

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Mikuni BST40, K&N filter, Stage2 cam, Verslagen tensioner, Sportster muff, 120 proof moonshine, Pirelli MT 66 tourers... and a chain conversion too !

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firedawg YaBB Newbies Offline SuzukiSavage.com Rocks! Posts: 12 Mid Michigan Gender:	Re: auxilary fuel tank? Reply #9 - 07/23/08 at 14:26:01 mpescatori I cruise about 75 on the highway. A windshield is in the plans as soon as it's in the budget. Can't justify a new tire (even though I would prefer a metz) this one looks brand new. That oil tank is a great idea. They're about $145 on the cite you mentioned. 3.5 quarts
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Roadie Full Member Offline No, it's not a Harley. Posts: 201 Lansing MI Gender:	Re: auxilary fuel tank? Reply #10 - 07/23/08 at 18:23:06 Or you could just order one of these and save the headache... http://www.tourtank.com/ Though someone might think you are on the way to a kegger.. But that's ok.
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: auxilary fuel tank? Reply #11 - 07/23/08 at 19:09:44 For $145.00 seems some bags & a 1 gallon container with gas in it would be easy & less $$$.Then, Youd have bags for running errands, trips for a few groceries & the gas could stay home. & you should have a few bucks in the pocket.
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Gort Ex Member	Re: auxilary fuel tank? Reply #12 - 07/23/08 at 19:49:51 Robert Fulton traveled the world in the '30s, using a hand made aux. gravity feed gas tank mounted on the rear of his Douglas Twin. He had no problems with it.
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Jack_650

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Re: auxilary fuel tank?
Reply #13 - 07/23/08 at 19:50:53

I did the four gallon tour tank on the back. You can set it up for a quick removal if you like. Then later replaced the stock tank with a five gallon off of a Harley SoftTail. Now I can go 400+ miles if needed between fuel stops. It comes in handy on the 4k+ mile trips I've done on the little 650 that can.
There's another guy on here who's just done the stock tank swap with a Harley cop cycle that sounded easier than my conversion did by a bit.

http://bikepics.com/members/jazzcarter/00savage/

Jack

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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: auxilary fuel tank? Reply #14 - 07/23/08 at 21:29:17 That guy was wearing that huge coat & shorts???
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