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Main Area => General GS500 Discussion => Topic started by: st8racin on April 18, 2006, 10:14:21 AM

Title: Gas tank question
Post by: st8racin on April 18, 2006, 10:14:21 AM
So I discovered this weekend that somehting is with the reserve on my tank. Haven't really taken the time to try to figure out what yet but I was wondering if this is a problem on the 2000 model?

One thing that I was contemplating was putting a fuel light in instead of the reserve. Has anyone done this already? Can it even be done?
Title: Re: Gas tank question
Post by: NiceGuysFinishLast on April 18, 2006, 10:31:28 AM
What do you mean something's wrong with reserve on your tank? We need specifics. Reserve is simply a hose that is about an inch lower in the tank than the pickup for "ON". I don't remember ever reading about anyone putting a fuel light on their GS, but I've only been around for 7 months, so someone could have done it way before I showed up. Perhaps a search is in order. Until you give specifics about your problem, I can't offer any help, sorry.
Title: Re: Gas tank question
Post by: st8racin on April 18, 2006, 10:47:00 AM
IDK what happened, I switched to reserve and then left the parking lot, little ways down the road (less than 2 miles) the bike died. I switched back to the main tank (err switch err whatever, sorry I suck at technical terms) and the bike started back up. But there wasn't enough gas to make it much farther down the road. Ended up having to hop on my friends bike with him and go back to my apt for a gas can b/c it just wouldn't start. Got it filled back up and everything works fine. My friend has far more motorcycle knowledge than I do and he said he thinks that the I need to sync the carbs, not sure this has to do with anything or not. The switch on my tank is all messed up too, it doesn't line up with the writing. I'll have to run out and take a pic. Another thing my friend and I doscovered when I got the bike was that the tank shut off valve is facing the wrong way. I'm not sure if this is a manufacturer error or if one of the previous owners did this.
Title: Re: Gas tank question
Post by: st8racin on April 18, 2006, 11:18:16 AM
Here's a quick pic...

(http://img.photobucket.com/albums/v210/sunfiresarah/100_0461.jpg)

Title: Re: Gas tank question
Post by: 3imo on April 18, 2006, 11:30:25 AM
Quote from: st8racin on April 18, 2006, 10:47:00 AM
The switch on my tank is all messed up too, it doesn't line up with the writing. I'll have to run out and take a pic. Another thing my friend and I doscovered when I got the bike was that the tank shut off valve is facing the wrong way. I'm not sure if this is a manufacturer error or if one of the previous owners did this.

The switch looks fine.  it is in the "ON" position. turn left and it will be in "RES"erve.  straight up in "PRI"me

The tank shut off switch is a little funny.  it only takes a 1/4 turn to turn off.  but it will turn 3/4 of the way.
I don't think I am putting it into words right.

anyway, under the tank the slot must "point" down for fuel to flow.

the problems you describe sound like the time I had the reserve and main lines switched out.
I would also suspect the carbs, but you should rule out the fuel lines first.

good luck :thumb:
Title: Re: Gas tank question
Post by: 3imo on April 18, 2006, 11:33:32 AM
oh yeah, when I was troubleshooting my "reserve" line issues I kept a small bottle of fuel with me, when the tank was nearing empty.

the bike ran outta fuel and I was able to limp to a gas station.  I put in about 1/4 gal and drove around trying to figure out the prob.

hope this helps
Title: Re: Gas tank question
Post by: st8racin on April 18, 2006, 11:36:29 AM
Quote from: 3imo on April 18, 2006, 11:30:25 AM


the problems you describe sound like the time I had the reserve and main lines switched out.
I would also suspect the carbs, but you should rule out the fuel lines first.

good luck :thumb:

I should probably check that out. My friend and I put longer fuel lines on it when I got the bike so you could actually take the tank off and not have to remove the fuel lines, maybe we got them switched around. Sucks he's in Californina this week for work. I night have to tackle this one on my own.

Thanks 3imo  :icon_mrgreen:
Title: Re: Gas tank question
Post by: Mandres on April 18, 2006, 11:41:33 AM
agreed, I'd bet you have the main and res lines switched.  Remember the longer tube on the petcock is the reserve and then use this page to double check everything:

http://www.gstwin.com/fuel_hose_routing.htm

-M
Title: Re: Gas tank question
Post by: NiceGuysFinishLast on April 18, 2006, 11:47:34 AM
Should be an easy fix, you can do it yourself, no doubt. The longest tube on the petcock is reserve, the other is the main. Just make sure they go to the right spots, shouldn't take you too long.

Crap.. looks like mandres beat me to it!
Title: Re: Gas tank question
Post by: st8racin on April 18, 2006, 11:48:11 AM
Ok looking at that diagram and the one in my Clymer is making me question the fuel shut off valve again. I'm a noob so plz bare with me on this. The fuel shut off on my bike faces to to right side of the bike not the left like it shows in the clymer pics. Could this be another reason the reserve isn't working right? Or are the tubes too close together for this to eaven matter?
Title: Re: Gas tank question
Post by: 3imo on April 18, 2006, 12:04:27 PM
my clymers confused me too.  use the diagram Mandres posted.  it is correct.

one thing.    just to clear up the terms. 

just under the tank is the "tank mounted petcock" it has a fuel shutoff switch.
on the frame is the "frame mounted petcock" it only switches betwix  main/reserve/prime

The "Fuel shutoff valve" you mentioned I think you mean the "tank mounted petcock"

if so, it doesn't matter where it faces.  a PO might have switched it around.  as long as you have the longer tube connected to reserve.

or I misunda sttod you....if then...sorry  :dunno_white:
Title: Re: Gas tank question
Post by: 3imo on April 18, 2006, 12:08:23 PM
http://i47.photobucket.com/albums/f191/eimoytiana/www_gs500_de_HoseRouting.jpg

if this is what your refereing to, mine faces to the right. 
Title: Re: Gas tank question
Post by: st8racin on April 18, 2006, 12:14:17 PM
3imo yeah I meant the tank mounted petcock...like i said I suck at technical terms. Mine faces left but if it doesn't matter then no worries. The frame mounted petcock just seems odd to me that it has an arrow on the lever but it doesn't corespond to the writing on the petcock. Might fix that someday when I'm bored.

Just went out and looked, lines are definitely wrong. I unfortunatelly don't think I have the motivation to fix them today.

[Edit] Back to the possibility of the fuel light idea. Can someone explain to me how the fuel light works on bikes that have them. What senses that the fuel is low?
Title: Re: Gas tank question
Post by: LimaXray on April 18, 2006, 12:42:55 PM
Unless there is some crazy way of doing it in the MC world, fuel level is determined by a float that sits in the tank, and in a idiot light only case it would trigger a switch to make the light come on when it fell below a certain point.  Like I said unless there's some crazy MC way of doing it, I don't see a practical way of installing a float without some significant modifications to the tank.  Maybe theres a kit out there?
Title: Re: Gas tank question
Post by: che mike on April 18, 2006, 01:05:31 PM
Quote from: st8racin on April 18, 2006, 11:36:29 AM

I should probably check that out. My friend and I put longer fuel lines on it when I got the bike so you could actually take the tank off and not have to remove the fuel lines, maybe we got them switched around. Sucks he's in Californina this week for work. I night have to tackle this one on my own.

Thanks 3imo  :icon_mrgreen:

if your friend thought you needed to sync the carbs to cure this problem, and he switched the fuel hoses on you, maybe you're better off learning to do it all yourself. before you know it he'll be telling you that the slight front end chatter you feel are bad valve guides, and that you need to take apart the bottom end of the engine to adjust the clutch freeplay ...
Title: Re: Gas tank question
Post by: Chuck on April 18, 2006, 01:12:14 PM
Quote from: LimaXray on April 18, 2006, 12:42:55 PM
Unless there is some crazy way of doing it in the MC world, fuel level is determined by a float that sits in the tank, and in a idiot light only case it would trigger a switch to make the light come on when it fell below a certain point.  Like I said unless there's some crazy MC way of doing it, I don't see a practical way of installing a float without some significant modifications to the tank.  Maybe theres a kit out there?

A minimally invasive way to do it would be like my lawn tractor, which has the gauge integrated with the cap, if you think you can fabricate a fuel cap.  But you may not be able to reach the bottom of the tank reliably enough to get a good reading.

Another way, if you can make/buy a float sensor smaller than the ID of the fuel line, is to shove it up the main fuel line up into the tank, and seal it off with something gasoline-proof.  Then just draw your fuel from reserve, but enjoy your idiot light when the fuel goes below your sensor.

None of those ideas are tested, and they both probably suck. :)
Title: Re: Gas tank question
Post by: st8racin on April 18, 2006, 01:17:17 PM
Quote from: che mike on April 18, 2006, 01:05:31 PM
Quote from: st8racin on April 18, 2006, 11:36:29 AM

I should probably check that out. My friend and I put longer fuel lines on it when I got the bike so you could actually take the tank off and not have to remove the fuel lines, maybe we got them switched around. Sucks he's in Californina this week for work. I night have to tackle this one on my own.

Thanks 3imo  :icon_mrgreen:

if your friend thought you needed to sync the carbs to cure this problem, and he switched the fuel hoses on you, maybe you're better off learning to do it all yourself. before you know it he'll be telling you that the slight front end chatter you feel are bad valve guides, and that you need to take apart the bottom end of the engine to adjust the clutch freeplay ...

I trust my friend, he made a mistake is all. The thing about syncing the carbs has more to do with the fact that I have only had the bike about 2 months and have no idea when this was done last if at all.
Title: Re: Gas tank question
Post by: Egaeus on April 18, 2006, 03:30:18 PM
Quote from: che mike on April 18, 2006, 01:05:31 PM
if your friend thought you needed to sync the carbs to cure this problem, and he switched the fuel hoses on you, maybe you're better off learning to do it all yourself. before you know it he'll be telling you that the slight front end chatter you feel are bad valve guides, and that you need to take apart the bottom end of the engine to adjust the clutch freeplay ...

Just what I was going to say.  Your friend is, I'm sorry to say, completely clueless.  He may be very well intentioned, but for god's sake don't let him touch your motorcycle with a freaking tool!  He doesn't know what he's doing. 
Title: Re: Gas tank question
Post by: ambisinister on April 18, 2006, 03:35:29 PM
I would have to agree. "knowledgeable" friends can sometimes be your worst enemy(unintentionally, of course). Listen to your friends, but get independent confirmation as much as possible
Title: Re: Gas tank question
Post by: Egaeus on April 19, 2006, 06:33:30 AM
Quote from: st8racin on April 18, 2006, 01:17:17 PM
I trust my friend, he made a mistake is all. The thing about syncing the carbs has more to do with the fact that I have only had the bike about 2 months and have no idea when this was done last if at all.
If you described the problem to him like you did to us, then the issue is much worse than a simple mistake.  It's a fundamental lack of troubleshooting skills.  However, it's your bike and your decision.
Title: Re: Gas tank question
Post by: MarkusN on April 19, 2006, 06:45:56 AM
Guys, don't get your panties in a buch. Nothing in the OP's original text suggests that the friends recommendation to synch the carbs was in reply to the fuel problem. The two things could be (and probably are) completely untrelated.
Title: Re: Gas tank question
Post by: 3imo on April 19, 2006, 06:47:27 AM
Quote from: Egaeus on April 19, 2006, 06:33:30 AM
Quote from: st8racin on April 18, 2006, 01:17:17 PM
I trust my friend, he made a mistake is all. The thing about syncing the carbs has more to do with the fact that I have only had the bike about 2 months and have no idea when this was done last if at all.
If you described the problem to him like you did to us, then the issue is much worse than a simple mistake.  It's a fundamental lack of troubleshooting skills.  However, it's your bike and your decision.

Ouch! Egaeus.  "fundamental lack of troubleshooting skills."   well beat around the bush why dont cha  :laugh:

as the devils advocate, I say give the guy a break, he was trying to help.  
in fact, on this site, the first thing anyone brings up is carbs this and carbs that.  
on day I may be wrong one time in the distance future, although unlikely.

advise is advise, and you have to take it as such.
I'd give Sarah a pat on the back for checking with us before tearing into the carbs on "advise".

Sarah, thank your freind for his help, let him know he was wrong and laugh about it over a beer.

Don't gouge his eyes out just yet. he might be right next time  :thumb:
Title: Re: Gas tank question
Post by: st8racin on April 19, 2006, 06:47:45 AM
Quote from: Egaeus on April 19, 2006, 06:33:30 AM
Quote from: st8racin on April 18, 2006, 01:17:17 PM
I trust my friend, he made a mistake is all. The thing about syncing the carbs has more to do with the fact that I have only had the bike about 2 months and have no idea when this was done last if at all.
If you described the problem to him like you did to us, then the issue is much worse than a simple mistake.  It's a fundamental lack of troubleshooting skills.  However, it's your bike and your decision.

No I didn't really describe the problem to him like I did on here. He was riding with me but I was a bit flustered after running out of gas in the middle of traffic. It was also just coming over a hill so I was rather worried about a car flying over the hill and hitting me. I also didn't mention that I sorta dropped the bike pulling into a parking space behind him, was hoping to leave that part out for the sake of my already bruised pride, so we were concerned that I might have screwed something up mechanically. The bike was acting wierd for just being out of gas but I suppose the messed up fuel lines would be cause for that. Trying to figure out what wrong with your bike on the side of the road with cars zipping by kinda suck. I'm gonna try to avoid that situation from now on.
Title: Re: Gas tank question
Post by: NiceGuysFinishLast on April 19, 2006, 08:14:29 AM
Quote from: st8racin on April 19, 2006, 06:47:45 AM
I'm gonna try to avoid that situation from now on.

+1! And remember, keep the shiny side up, and the sticky side down!  :)
Title: Re: Gas tank question
Post by: st8racin on April 19, 2006, 09:35:56 AM
WOOT!!! Got the lines all fixed. Almost forgot to turn the petcock back to the on position before I put it back together but I caught it in time. Started it up and seems to be running fine and I didn't see anything leaking so I'm gonna say that's a good sign.
Title: Re: Gas tank question
Post by: LimaXray on April 19, 2006, 09:57:44 AM
oh no you want some gas leaking... gas spilling everywhere is good luck
Title: Re: Gas tank question
Post by: Onlypastrana199 on April 19, 2006, 10:18:00 AM
Glad u got it all sorted out  :thumb:
Title: Re: Gas tank question
Post by: 3imo on April 19, 2006, 10:42:01 AM
Quote from: Onlypastrana199 on April 19, 2006, 10:18:00 AM
Glad u got it all sorted out  :thumb:
+1   :cheers:
Title: Re: Gas tank question
Post by: kurtr on April 19, 2006, 11:12:18 AM
Quote from: 3imo on April 18, 2006, 11:30:25 AMThe switch looks fine.  it is in the "ON" position. turn left and it will be in "RES"erve.  straight up in "PRI"me

I've only had my 2001 bike for a couple months and the fuel switch is confusing me.  I thought the switch was a shut-off switch.  Like, when the bike is parked, I should turn the fuel switch OFF.  From reading your post, it looks like the three positions are:
   ON   (Main "tank")
   RES   (Reserve "tank")
   PRI    (This one confuses me.  I figured this meant "Primary" -- sort of like "ON").

Your post says PRI means "prime."  What is that?  When is it used?

Much thanks, in advance!

Kurt
Title: Re: Gas tank question
Post by: LimaXray on April 19, 2006, 11:15:21 AM
you can leave it set to 'ON' all the time.  'ON' and 'RES' vacuum feed the fuel into the carbs, so fuel will only flow when the engine is running.  'PRI', which it prime, allows fuel to run into the fuel with out the engine running to fill 'prime' the carbs after they have been drained or serviced
Title: Re: Gas tank question
Post by: 3imo on April 19, 2006, 11:25:26 AM
welcome .

The "PRI"  is for prime.  i may be off but someone will correct me if I am wrong.

Our engines use gravity to feed fuel to the carbs.
if the carbs reserviors are empty (for whatever reason)  "PRI"  uses a vaccum pump to "Prime" the empty carbs.

the vaccum pump is a diaphram in the frame mounted Petcock.  it is connected to the carbs. when the engine is cranked it will act as a fuel pump.

does that makes sense to ya?
Title: Re: Gas tank question
Post by: 3imo on April 19, 2006, 11:27:11 AM
uh..oh   

LX  who's right?  me or you?

:laugh: :laugh: :laugh: :laugh: :laugh: :laugh: :laugh:
Title: Re: Gas tank question
Post by: Chuck on April 19, 2006, 11:33:24 AM
LX is right.
Title: Re: Gas tank question
Post by: LimaXray on April 19, 2006, 11:33:51 AM
 :icon_mrgreen:
Title: Re: Gas tank question
Post by: 3imo on April 19, 2006, 12:11:13 PM
Ok, If I am wrong i'm wrong.   :icon_confused:

I will check it out when I get to the house.
Title: Re: Gas tank question
Post by: 3imo on April 19, 2006, 12:27:46 PM
Yup, I am wrong. reference--  http://www.dansmc.com/gastank.htm
Quote
The second type of petcock has a diaphragm that automatically shuts off the gas when the engine stops. You will see a hose going from the petcock to a fitting on the intake manifold of one of the carbs. This supplies vacuum to one side of the diaphragm, opening the fuel valve inside the petcock. These petcocks have three settings. ON-RESERVE-PRI. ON is on. Reserve is reserve and PRI is Prime. Prime bypasses the diaphragm so you can fill the carbs with gas after they have been drained. Set it on PRI, fill the carbs and put it back to ON. Sometimes, ON is called MAIN.

like I said "someone will correct me if I'm wrong"  :thumb: 
Title: Re: Gas tank question
Post by: LimaXray on April 19, 2006, 12:59:14 PM
It's ok, I forgive you, not everyone can be perfect like me  :laugh: :laugh:

Title: Re: Gas tank question
Post by: Egaeus on April 19, 2006, 03:57:09 PM
Quote from: LimaXray on April 19, 2006, 11:15:21 AM
you can leave it set to 'ON' all the time.  'ON' and 'RES' vacuum feed the fuel into the carbs, so fuel will only flow when the engine is running.  'PRI', which it prime, allows fuel to run into the fuel with out the engine running to fill 'prime' the carbs after they have been drained or serviced
or you run out of gas.
Title: Re: Gas tank question
Post by: Egaeus on April 19, 2006, 04:07:29 PM
Quote from: 3imo on April 19, 2006, 12:27:46 PM
Yup, I am wrong. reference--  http://www.dansmc.com/gastank.htm
Quote
The second type of petcock has a diaphragm that automatically shuts off the gas when the engine stops. You will see a hose going from the petcock to a fitting on the intake manifold of one of the carbs. This supplies vacuum to one side of the diaphragm, opening the fuel valve inside the petcock. These petcocks have three settings. ON-RESERVE-PRI. ON is on. Reserve is reserve and PRI is Prime. Prime bypasses the diaphragm so you can fill the carbs with gas after they have been drained. Set it on PRI, fill the carbs and put it back to ON. Sometimes, ON is called MAIN.

like I said "someone will correct me if I'm wrong"  :thumb: 
You have a complete lack of troubleshooting skills!  :icon_mrgreen:

Seriously though, It's hard to believe that with all the bikes you've disassembled, you've never taken apart a petcock.  There is a diaphragm that stops fuel flow when closed.  When the engine's running, the diaphragm is opened.  PRI bypasses that diaphragm and gets fuel straight from the RES hose.
Title: Re: Gas tank question
Post by: Wrecent_Wryder on April 19, 2006, 04:45:16 PM
d2
Title: Re: Gas tank question
Post by: 3imo on April 20, 2006, 07:05:43 AM
Quote from: Egaeus on April 19, 2006, 04:07:29 PM
You have a complete lack of troubleshooting skills!  :icon_mrgreen:

Seriously though, It's hard to believe that with all the bikes you've disassembled, you've never taken apart a petcock.  There is a diaphragm that stops fuel flow when closed.  When the engine's running, the diaphragm is opened.  PRI bypasses that diaphragm and gets fuel straight from the RES hose.

:flipoff:   :icon_mrgreen:

actually I have taken mine apart for the 99'  I had to replace the o-ring that seals the switch. I assumed the bike was gravity fed because I have run the engine, bypassing the frame mounted petcock with a plastic bottle.

  I just made a mistake. just like that guy with "a complete lack of troubleshooting skills".  I guess in a way I proved that point.
Anyway I stated that I mightve been wrong, and if I was somone would correct me, as LX did.  :cheers:

this site rocks :thumb: