Title: No fuel flow from tank to petcock?
Post by: WarriorRacer#13 on January 23, 2005, 07:21:50 PM
Post by: WarriorRacer#13 on January 23, 2005, 07:21:50 PM
As some of you may know, I'm reassembling a 96 GS for a friend. I boiled out and reassembled the carbs (they'd let it sit for...oh...2 year), painted the body work and put it all back together. I used Kerry's directions to make sure the lines were run right. But tonight when I tried to fire 'er up, there's no fuel flowing fromt he tank to the petcock. I had it on 'ON' and then turned it to RES, ut still nothing. There's fuel in the tank (not a lot, but some) and I fgured on RES, it would suck the tank dry. Maybe there's just not enough gas in the tank...I'll fill it tomorrow...but is there anything else that would cause this?
Title: No fuel flow from tank to petcock?
Post by: VTNewb on January 23, 2005, 07:34:50 PM
Post by: VTNewb on January 23, 2005, 07:34:50 PM
Use "PRI" to fill the carb float bowls, from there use res or on
Title: No fuel flow from tank to petcock?
Post by: Ry_Guy on January 23, 2005, 09:54:17 PM
Post by: Ry_Guy on January 23, 2005, 09:54:17 PM
I'm having kinda the same problem, except I still get some fuel through. There were suggestions that it could be caused by a vaccum up by the fuel cap, maybe something up there that is clogging an air passage that would allow air to go in and gas to leave the tank. That's the next thing I'll check this spring when I bring mine out.
Title: No fuel flow from tank to petcock?
Post by: Ed89 on January 23, 2005, 11:07:22 PM
Post by: Ed89 on January 23, 2005, 11:07:22 PM
Did you turn on the tank-mounted fuel switch/petcock? If the tank-mounted petcock is turned on, then the two lines to the frame petcock (the ON-PRI-RES petcock) should be filled with fuel immediately (if you have enough fuel in the tank). The engine need not be running for that to happen.
Maybe your line is clogged, or kinked/pinched. :dunno:
Cheers,
e.
Maybe your line is clogged, or kinked/pinched. :dunno:
Cheers,
e.
Title: Re: No fuel flow from tank to petcock?
Post by: The Buddha on January 23, 2005, 11:26:19 PM
Post by: The Buddha on January 23, 2005, 11:26:19 PM
Quote from: WarriorRacer#13As some of you may know, I'm reassembling a 96 GS for a friend. I boiled out and reassembled the carbs (they'd let it sit for...oh...2 year), painted the body work and put it all back together. I used Kerry's directions to make sure the lines were run right. But tonight when I tried to fire 'er up, there's no fuel flowing fromt he tank to the petcock. I had it on 'ON' and then turned it to RES, ut still nothing. There's fuel in the tank (not a lot, but some) and I fgured on RES, it would suck the tank dry. Maybe there's just not enough gas in the tank...I'll fill it tomorrow...but is there anything else that would cause this?
You boiled out the carbs ... you sure you not trying to make moonshine ... That kentucky stuff is nice ... :lol: :lol: :lol:
Cool.
Srinath.
Title: No fuel flow from tank to petcock?
Post by: WarriorRacer#13 on January 24, 2005, 08:20:24 AM
Post by: WarriorRacer#13 on January 24, 2005, 08:20:24 AM
I did not turn on the tank petcock. Didn't notice that there was one. I thought it was all vacuum-operated. I shall check that tonight and get this baby purrin'.
As for the boiling...we used acid on the carbs, but I can tell you from personal experience that moonshine is just about that strong :o You notice you don't see anybody smoking when they're drinkin' 'shine. Can you say 'explosion hazard'? :)
As for the boiling...we used acid on the carbs, but I can tell you from personal experience that moonshine is just about that strong :o You notice you don't see anybody smoking when they're drinkin' 'shine. Can you say 'explosion hazard'? :)
Title: No fuel flow from tank to petcock?
Post by: Kerry on January 24, 2005, 02:43:59 PM
Post by: Kerry on January 24, 2005, 02:43:59 PM
Quote from: Ed89Did you turn on the tank-mounted fuel switch/petcock?See hopefully helpful photo (from right side of bike) below.
The fuel tank petcock is ON when the slot is vertical. When it is turned in either direction to a horizontal position it is all the way OFF.
Title: No fuel flow from tank to petcock?
Post by: WarriorRacer#13 on January 24, 2005, 03:14:38 PM
Post by: WarriorRacer#13 on January 24, 2005, 03:14:38 PM
Aaaaaaaah...see, that would be why I didn't turn on that petcock...'cuz it doesn't look like a petcock :x Before you think me a dunce 'cuz I didn't think about why gas wasn't running out of the tank...I thought it was vaccuum operated. Hopefully I'll have it running by dinnertime!
Title: No fuel flow from tank to petcock?
Post by: Jake D on January 24, 2005, 04:03:35 PM
Post by: Jake D on January 24, 2005, 04:03:35 PM
The gas cap does seal pretty tight, so if the vent tube on the very underside of the tank is clogged or kinked, it could prevent gas from running out. But it is obviously screw on the fuel valve. Make sure you get it turned all the way on. It is pretty tricky.
Title: No fuel flow from tank to petcock?
Post by: WarriorRacer#13 on January 24, 2005, 08:34:28 PM
Post by: WarriorRacer#13 on January 24, 2005, 08:34:28 PM
From one thing to another...got gas going to the carbs, got the bike fired, but it will NOT idle and won't rev past 7K. I've got the idle screw turned way, way, WAY in just to get it to idle at about 1500 (I know, it should be at about 1000...humor me for a minute). The airscrews are set at 2 turns out from bottomed. I got it running and turned the idle up to about 3,000, then sprayed brake cleaner on the carbs to see if there was a leak. Apparently there is, 'cuz it revved in a BIG hurry. So it would seem to be an air leak in the top of the carbs, I'm guessing. But what I don't understand is that if I hold the throttle at about 2K, then choke it, it dies like it's being drowned out. If it was an air leak, shouldn't putting the choke on HELP it?
I know I may have started to sound like I don't know what I'm doing, but I'm used to dealing with my racequad (a Yamaha Warrior...single cylinder thumper) and it's a lot simpler. Before the carbs went back on, I had my engine builder ( a BIG Suzuki guy) put them in sync, so I know that's set right. And the needle only has one clip position, so I know that's right. the only thing that I actually changed from how it was before was to put a UNI filter in it instead of the stock paper. Granted, that would flow more air, but not THAT much.
I'm gonna pull the carbs off tomorrow night and check everything. My engine guy suggested a small bead of grease around the rubber seal on the top of the carbs to make sure it's not leaking there. Is there anything else you gurus would check first?
Sorry for the long post and all the questions, but I'd rather refer to people that know than spend two weeks fumbling my way around. Thanks in advance...again.
I know I may have started to sound like I don't know what I'm doing, but I'm used to dealing with my racequad (a Yamaha Warrior...single cylinder thumper) and it's a lot simpler. Before the carbs went back on, I had my engine builder ( a BIG Suzuki guy) put them in sync, so I know that's set right. And the needle only has one clip position, so I know that's right. the only thing that I actually changed from how it was before was to put a UNI filter in it instead of the stock paper. Granted, that would flow more air, but not THAT much.
I'm gonna pull the carbs off tomorrow night and check everything. My engine guy suggested a small bead of grease around the rubber seal on the top of the carbs to make sure it's not leaking there. Is there anything else you gurus would check first?
Sorry for the long post and all the questions, but I'd rather refer to people that know than spend two weeks fumbling my way around. Thanks in advance...again.
Title: No fuel flow from tank to petcock?
Post by: Kerry on January 24, 2005, 08:58:13 PM
Post by: Kerry on January 24, 2005, 08:58:13 PM
Where exactly did you spray the brake cleaner? If you sprayed it on/near the top of the carbs then be sure to check for item #26 in this diagram (http://houseofmotorcycles.bikebandit.com/partsbandit/showschematic~dept_id~725131.asp) when you take the carbs apart. It is a tiny O-ring (the smallest one in this rebuild kit (http://www.bbburma.net/MiscFotos/PartsNMore_CarbRebuildKit.jpg)) and if it's missing or cracked it can cause a vacuum leak.
If you applied the brake cleaner more like THIS (http://www.bbburma.net/MiscFotos/100_0797_Carb_Engine_Boots.jpg) then check the rubber boots themselves (cracked? torn?) as well as their connection to the carbs and the engine block.
Keep us posted!
If you applied the brake cleaner more like THIS (http://www.bbburma.net/MiscFotos/100_0797_Carb_Engine_Boots.jpg) then check the rubber boots themselves (cracked? torn?) as well as their connection to the carbs and the engine block.
Keep us posted!
Title: No fuel flow from tank to petcock?
Post by: Jared on January 24, 2005, 09:10:32 PM
Post by: Jared on January 24, 2005, 09:10:32 PM
Try going out to 3 turns on the mixture screws... (One turn is a full 360 degrees...that is the way you are counting them correct?)
Also double check The stuff Kerry mentioned first .
Also double check The stuff Kerry mentioned first .
Title: No fuel flow from tank to petcock?
Post by: gerharddvs on January 25, 2005, 05:04:24 AM
Post by: gerharddvs on January 25, 2005, 05:04:24 AM
HI, Concerning your problem that the bike doesn't want to rev past 7000 rpm. I had exactly the same problem and I found that the breather pipe going to the carbs was clogged.I don't know why it caused this problem but after unblocking it (by accedint, I pinched the pipe wioth the tank) the bike was running fine. You also mitght want to checjk your float levels. Theres a nice method on this site.