Gas coming out of overflow tube-no start

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mannafanna
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Gas coming out of overflow tube-no start

#1 Unread post by mannafanna » Wed Oct 01, 2014 7:42 pm

2004 Cb600f hornet

Just cleaned out carbs/replaced gaskets/replaced fuel tube. Bike has been sitting for about 2 weeks while i was waiting for the fuel tube to come in, battery does not appear to be dead. Added some fuel cleaner to the gas and mixed it around.

Tried to start it up, it worked the first time but died after about 10 seconds or so with choke fully on (like it lost power)

Tried to push start it, did not work, gas came leaking out of the overflow tube for the gas tank.

Before i take it all apart again, any ideas what could be causing this? Thank you

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Re: Gas coming out of overflow tube-no start

#2 Unread post by GS_in_CO » Wed Oct 01, 2014 9:31 pm

Did the bike used to work?

For fuel out the overflow - fuel cap isn't tight? Gas sloshing in the full tank? Don't mess with push starting if you aren't really sure it'll start.
You might be 2 miles down the road and downhill before you give up. Not good. Just recharge the battery.

For no-start- does it have a vacuum petcock? If so, you should put it to prime to flow fuel to the carbs before trying to start.
Most carbs have a drain screw - you can test for fuel in the bowls by opening the drain on one of the carbs and see that you get a good quantity of fuel out.
Ron

Current: 1988 BMW R100GS (the 'numberplate' model)

Past: 1987 Yamaha XT350
1983 Honda CB900F
1980 Honda XL185S
1979 Suzuki GS425E

mannafanna
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Re: Gas coming out of overflow tube-no start

#3 Unread post by mannafanna » Wed Oct 01, 2014 9:35 pm

GS_in_CO wrote:Did the bike used to work?

For fuel out the overflow - fuel cap isn't tight? Gas sloshing in the full tank? Don't mess with push starting if you aren't really sure it'll start.
You might be 2 miles down the road and downhill before you give up. Not good. Just recharge the battery.

For no-start- does it have a vacuum petcock? If so, you should put it to prime to flow fuel to the carbs before trying to start.
Most carbs have a drain screw - you can test for fuel in the bowls by opening the drain on one of the carbs and see that you get a good quantity of fuel out.
Yes it used to work. I had to replace the hose because it had a huge tear in it and was leaking gas. I believe it is a vacuum petcock. I only have reserve-off-on settings on it. i will try to unscrew the drain

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Re: Gas coming out of overflow tube-no start

#4 Unread post by mannafanna » Wed Oct 01, 2014 9:47 pm

update: I unscrewed the drain on the leftmost carb, got some gas coming out

gas cap is secure far as i can tell

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Re: Gas coming out of overflow tube-no start

#5 Unread post by BRUMBEAR » Thu Oct 02, 2014 6:22 am

Are you sure the overflow tube is for the tank and not the carbs(it may be a stuck float pin) If not then pull em apart again something is probably not right.
You could also try opening the fuel cap it may be clogged vent not letting the fuel run down as you now have fuel in it
there aint nothin like it

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Re: Gas coming out of overflow tube-no start

#6 Unread post by GS_in_CO » Thu Oct 02, 2014 7:43 am

Owner's manual might say something about whether Reserve is the same as Prime on other bikes i.e. doesn't require vacuum to flow fuel.

You may have to apply vacuum to the petcock an see if it flows fuel easily - otherwise clogged.

Just thinking - during this I'd have the bike on the centerstand so the carbs are level. While starting on sidestand might work it could confuse the symptoms you are having.

Is the choke cable properly adjusted? If the carbs were removed for cleaning this could be an issue.
Ron

Current: 1988 BMW R100GS (the 'numberplate' model)

Past: 1987 Yamaha XT350
1983 Honda CB900F
1980 Honda XL185S
1979 Suzuki GS425E

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Re: Gas coming out of overflow tube-no start

#7 Unread post by mannafanna » Thu Oct 02, 2014 5:23 pm

GS_in_CO wrote:Owner's manual might say something about whether Reserve is the same as Prime on other bikes i.e. doesn't require vacuum to flow fuel.

You may have to apply vacuum to the petcock an see if it flows fuel easily - otherwise clogged.

Just thinking - during this I'd have the bike on the centerstand so the carbs are level. While starting on sidestand might work it could confuse the symptoms you are having.

Is the choke cable properly adjusted? If the carbs were removed for cleaning this could be an issue.
How do i apply vacuum to the petcock? Also for the choke cable, it appears to be working, it does have some slack at the end by the carbs, but it does slide the metal piece over when i use it

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Re: Gas coming out of overflow tube-no start

#8 Unread post by mannafanna » Thu Oct 02, 2014 5:24 pm

BRUMBEAR wrote:Are you sure the overflow tube is for the tank and not the carbs(it may be a stuck float pin) If not then pull em apart again something is probably not right.
You could also try opening the fuel cap it may be clogged vent not letting the fuel run down as you now have fuel in it
where is the fuel cap located and what does it look like?

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Re: Gas coming out of overflow tube-no start

#9 Unread post by BRUMBEAR » Thu Oct 02, 2014 7:33 pm

Its the gas cap usually a big thing you take off when you fill it :mrgreen:
there aint nothin like it

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Re: Gas coming out of overflow tube-no start

#10 Unread post by mannafanna » Thu Oct 02, 2014 8:25 pm

BRUMBEAR wrote:Its the gas cap usually a big thing you take off when you fill it :mrgreen:
haha oh ok just making sure its not something not obvious :p
i cant start the bike while its open because i cannot remove the key

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Re: Gas coming out of overflow tube-no start

#11 Unread post by GS_in_CO » Thu Oct 02, 2014 9:41 pm

mannafanna wrote:
How do i apply vacuum to the petcock?
If it's a vacuum petcock it has two rubber hoses attached to it. One is usually the larger diameter one that runs to the carbs.
The other is usually smaller and runs to cylinder head or possibly to the side of one carb.
Disconnect that one at the carb end and suck on it (unless you have a handheld vacuum pump) and see if causes fuel to flow freely out the gas line.
You also should not get flow thru that hose into your mouth (either air or gas). If you can continuously pull air thru it that means the diaphragm is ruptured anh vacuum is not opening the valve to let gas flow.

Other - could you explain more about what is meant by "the carbs were cleaned out."? How? Chemical on the bike? Removed from the bike? By you? By someone who does this all the time? Disassembled? Or just the bowls removed and carb cleaner sprayed?

What I've learned over the years is that often the reason for your current problem is related to the last thing that was done.
Ron

Current: 1988 BMW R100GS (the 'numberplate' model)

Past: 1987 Yamaha XT350
1983 Honda CB900F
1980 Honda XL185S
1979 Suzuki GS425E

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Re: Gas coming out of overflow tube-no start

#12 Unread post by mannafanna » Fri Oct 03, 2014 4:13 pm

Problem Fixed!!! turns out i gunked up the carbs accidentally with gasket sealant (bad move). bike runs fine now. thanks for all your help everyone

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Re: Gas coming out of overflow tube-no start

#13 Unread post by BRUMBEAR » Sat Oct 04, 2014 1:08 pm

great to hear!!!!
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Re: Gas coming out of overflow tube-no start

#14 Unread post by gsJack » Wed Oct 08, 2014 8:43 am

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Last edited by gsJack on Wed Oct 08, 2014 8:48 am, edited 1 time in total.

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Re: Gas coming out of overflow tube-no start

#15 Unread post by gsJack » Wed Oct 08, 2014 8:45 am

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