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Gas Tank V?s Auxiliary Fuel Tank to tune Carbs

  • Thread starter Thread starter RobG1970
  • Start date Start date
tas850g said:
Steve, do you have pics on how you seal the hole with the hose so it does not leak?
Click to expand...
Sorry, no pictures of the current setup, be here is a description.

In the original setup, I merely drilled a hole in the cap that was slightly smaller than the (new, supple) plastic tubing, then shoved the tubing through.
That worked for the first couple of times.

I decided that some sort of gasket was necessary, so I drilled the hole the next size larger, slid in a short piece of thin-wall tubing, then slid my gas line through that, wedging it into place. There is still a possibility of a leak, but it is greatly reduced. Because of that possibility, I hesitate to recommend using this setup, but it does work for me. Just please be aware of that possibility of a leak that might show up any time you turn the tank over (turning it ON or OFF), watch for it, deal with it if necessary.

.
 
OK, pictures will help, but how, or more importantly, WHY so high? :eek:

I just can't imagine climbing something that high to pour a bit of gasoline in, when it is so EASY to make something that will hang on the handlebars or sit on the frame rail over the airbox/battery area.

LOL.. I have it on a pulley system to raise and lower it out of my way or to fill it… when not in use, I just remove the hose from the bike and raise it up. LOL​
 
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RobG1970 said:
OK, pictures will help, but how, or more importantly, WHY so high? :eek:

I just can't imagine climbing something that high to pour a bit of gasoline in, when it is so EASY to make something that will hang on the handlebars or sit on the frame rail over the airbox/battery area.


LOL.. I have it on a pulley system to raise and lower it out of my way or to file it? when not in use, I just remove the hose from the bike and raise it up. LOL​
Click to expand...


Now Lowered...LOL
 
Steve said:
Sorry, no pictures of the current setup, be here is a description.

In the original setup, I merely drilled a hole in the cap that was slightly smaller than the (new, supple) plastic tubing, then shoved the tubing through.
That worked for the first couple of times.

I decided that some sort of gasket was necessary, so I drilled the hole the next size larger, slid in a short piece of thin-wall tubing, then slid my gas line through that, wedging it into place. There is still a possibility of a leak, but it is greatly reduced. Because of that possibility, I hesitate to recommend using this setup, but it does work for me. Just please be aware of that possibility of a leak that might show up any time you turn the tank over (turning it ON or OFF), watch for it, deal with it if necessary.

.
Click to expand...

I have many of those Rotella jugs, but the sealing issue always frustrates me.

When I have tried the bottle/tube method with an old 1/2 liter water bottle, I also had problems with venting, because the bottle would collapse as fuel flows, creates a vacuum, etc. How do you vent that Rotella bottle, or is that a non-issue in your experience?
 
The I/v Mr. GK displayed is actually mine and I've used it that way for 7 or 8 years now with no issues. The hose connects to a piece of brass tube through the cap that its Epoxy puttied in place and coated with automotive type Goop which is rated for gasoline.

One thing I would definitely stress is that there be an inline fuel filter added as I found recently that gas from the pumps is not always free of "floaters" as this pic will show:
fuel2.jpg


The filter in the tank's petcock would usually filter this out so if you don't want to rebuild carb's again, its a bit of cheap insurance.

So show us what you come up with.

Cheers,
Spyug
 
RobG1970 said:
Now Lowered...LOL
Click to expand...
Even though it is "lowered", I would drop it yet another foot, to get it closer to stock height. :-k


MisterCinders said:
How do you vent that Rotella bottle, or is that a non-issue in your experience?
Click to expand...
No venting. The way I look at it, the less gas you put in, the more air will still be in there. With a greater volume of air, it will take longer to develop sufficient vacuum to impede flow. Add that to the fact that you don't really draw that much gas from the gallon-size jug, I have never found venting to be a problem. I usually start with about a quart of gas, but never more than a half-gallon.

.
 
I went to my local auto parts and got a radiator overflow bottle. Has a cap and 3 nipples. $10. I cut one to place the fuel hose and 1 for a vent. When I am not using it, I place the hose over the vent and store it during the tuning process. Sealing is not a problem, since it was designed for a hose to be attached.
When I am done, I just pour the remainder in the mower gas can and store it away.
 
Steve said:
Even though it is "lowered", I would drop it yet another foot, to get it closer to stock height. :-k

I actual only lower it to fill it and open the petcock, why would it matter if it's gravity feed to be lower to the bike????
Click to expand...
 
The pressure on the needle and seat increases as your raise the tank. Fluid pressure of a column of a fluid can be calculated, but is beyond this discussion. Suffice to say that the taller the column, the higher the pressure.
Many issues can occur because of this added pressure, and you really don't want to do that.
Take that tank and hang it from your left hand grip. This will best emulate the natural pressure of an actual fuel tank.
 
koolaid_kid said:
The pressure on the needle and seat increases as your raise the tank. Fluid pressure of a column of a fluid can be calculated, but is beyond this discussion. Suffice to say that the taller the column, the higher the pressure.
Many issues can occur because of this added pressure, and you really don't want to do that.
Take that tank and hang it from your left hand grip. This will best emulate the natural pressure of an actual fuel tank.
Click to expand...

Okok- now things are making sence, how much slack in the hose if any???
 
Aux. fuel tanks

Aux. fuel tanks

Hey guys, I've been following your thread as I am about to try and sync. my carbs for the first time, just waiting on the new Manometer to arrive. I thought I would share these tanks I came across from a guy off another Suzuki site that posted them. They are actually made to mount to the GS1000, I have an 850, I am hoping to be able to use them on. But while I am waiting to get my tank back from being repainted I thought...Hey..I could use these as an aux. tank to check the carbs. I thinks I have mine mounted too high after reading the discussion. I havn't been able to come across any info on them. They appear well made...there were two in the set, they replace the side covers, came with all the mounting hardware and necessary tubing, fuel pump, inst. ect. Steve, I will email a copy of the front of the instructions to give you a little more info. Thanks guys
 
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Don't see why not, just need a good fuel flow to the carbs while ya sync them. Don't forget to put a fan on the engine as well,
 
Thanks Mr. Bill! Yes the fan! I did see that mentioned on another thread!
 
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