Reserve Fuel - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 10 (permalink) Old 09-20-2008, 11:19 PM Thread Starter
Benjammin'
 
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Reserve Fuel

I do not know how gas flows into our reserve tanks, so I have a question; Does it help to occasionally run our bike on reserve when plenty of gas is in the tank to 'flush' old, stale gas out of the reserve system? I refilled my bike today when it was really low on gas (I wasn't on reserve yet), but I wondered if the gas ever gets replaced in the reserve portion of our tanks.

Ben-
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post #2 of 10 (permalink) Old 09-20-2008, 11:39 PM
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As I understand the system, the reserve is just the last bit of fuel in the bottom of the tank. When you put more in the fuel is all mixed and fresh fuel is there.
No need to run it on reserve to "refresh" the fuel.

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post #3 of 10 (permalink) Old 09-21-2008, 12:19 AM
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That may not be entirely true. Depending on the quality of the gas and how long the gas sits in the tank, there may be some gummy deposits building up in the tank, and they may tend to sink to the reserve portion of the tank. When you refill the tank, those deposits may mix, but they will soon sink back to the bottom and the deposits may continue to build. I know some who routinely keep their petcock on reserve so the gas that's burned first is from the lowest portion of the tank, minimizing the accumulation of deposits. Got to be careful if you do that though, or you might run out of gas unexpectedly.

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post #4 of 10 (permalink) Old 09-21-2008, 08:21 AM
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There is only one gas tank. The petcock has a one tube that sticks up about a inch or two from the bottom of the tank and the other tube draws gas from the very bottom of the tank. There is ascreen on each of these to keep the big crap from going to the carbs.
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post #5 of 10 (permalink) Old 09-21-2008, 08:21 AM
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X2 on what Ruby said
There is no reserve "tank", just that the fuel pick-up line is a little shorter.
So, when the "On" position runs outta gas, the "Reserve" still has some.


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post #6 of 10 (permalink) Old 09-21-2008, 08:56 AM Thread Starter
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Excellent. Thanks folks. I got a much better picture of the "reserve".

I think it may be wise to run the bike on reserve for a while on occasion to make sure it all is the same gas, even in the lower parts of the tank. I guess the down side in doing that is- it will probably put more crap in my reserve side filter screen.

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Thanks.

Ben-
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'02 VN750
Pipes drilled
Spline lubed
R/R relocated
AGM batteried
Iridium equipped
LED tail lighted
8000-ish miled
Soon to be MCCTed

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post #7 of 10 (permalink) Old 09-21-2008, 02:21 PM
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It is always a good idea to run the bike now and then on the "reserve" setting, to simply keep the reserve tube clean.

Do note that if the gas is contaminated with water, the water sinks to the bottom of the tank, so, in theory, if you never use the reserve you could be collecting more water in the bottom.

Just be sure to remember to switch it back to run , as nothing is as annoying as finding you are running out of gas and reaching down to find out you are ALREADY on reserve.

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post #8 of 10 (permalink) Old 09-21-2008, 02:51 PM
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I leave mine on reserve, and did the same on my last bike. I don't mess with it, and let my fuel gauge be my guide. Riding around the city, or just outside of it where gas stations are plenty, it's not been any problem for me.
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post #9 of 10 (permalink) Old 09-24-2008, 06:56 PM
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I'm not sure I buy the "sinking deposits" theory (no offense intended, maybe some rust in the tank?) but Knife's right on the water settling. That comes naturally from condensation from the air inside the tank. Specially in the spring/fall when it's cool and the water vapor may not get a chance to evaporate before dripping into the gas. Run on the reserve occasionally to make sure everything works and keep dosing good ol' Seafoam on a regular basis and you should have yourself a clean tank/fuel system that's full of dry gas.

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Last edited by rsawyer; 09-24-2008 at 06:58 PM.
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post #10 of 10 (permalink) Old 09-24-2008, 07:02 PM
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Quote:
Originally Posted by 750Doug View Post
I leave mine on reserve, and did the same on my last bike. I don't mess with it, and let my fuel gauge be my guide. Riding around the city, or just outside of it where gas stations are plenty, it's not been any problem for me.
Thank God for the Kawasaki engineers who designed the gas gauge into the instrument cluster! It's one of the reasons I decisded on this bike. Easy to read, right up where you can see it with a quick glance!

'89 Vulcan 750

VROC# 30232

HID Headlamp Conversion
V&H Cruzers (great sound)
Kaw V-Force Windshield
Kaw Rear Luggage Rack
Kaw Engine Guard
VN750.COM Grill Cover
W&M Black Magic Saddlebags
Diehard M/F Battery
R/R Replaced/Relocated
Stator Replaced
Voltmeter Installed
Splines Lubed
Metzler 880 Marathons
Front - 110/90-19
Rear - 170/80-15
Carbs Balanced
Carb Mix Adjusted
Fuel Tank Derusted/Lined/Sealed
NGK Iridium Plugs
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