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Author Topic: Fuel and vacuum hoses - help?  (Read 277 times)

Brendan312

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Fuel and vacuum hoses - help?
« on: May 09, 2018, 07:44:35 AM »

Hey guys, I changed carbs in my GT250 and now it wont start. I cant figure out where all the hoses go.

I think everything is connected properly except for the nipple on top of the carb. Does anyone know what that connects to?

What ive done so far:

The fuel line that loops around the carbs is going to the fuel pump
The two small hoses below the carb are connected as they originally were
One fuel tank hose goes to the pump and the other to the rear manifold
The fuel tank breather hose just dangles
The third hose on the pump (not the one from the tank or to the carb) is another vacuum hose going to the front cylinder or manifold I think

It will turn over but not start. No fuel is coming through the carby jets and none in the carby fuel line so Iím thinking Iíve missed a vacuum line which is stopping the fuel pump from working.

It fired up before changing the carb so Iíve just hooked it up wrong

Please help :)
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Christianleon266

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Re: Fuel and vacuum hoses - help?
« Reply #1 on: May 09, 2018, 09:53:37 AM »

Hi Brendan312,
Please attach photos of your current configuration if possible. I went ahead and searched the forum, and found something that may be able to help.
http://korider.com/index.php?topic=21635.0
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2007 Kawasaki KX250F
1984 Yamaha Virago
1982 Honda V45 Sabre
1996 Kawasaki ZX6R
2009 Kawasaki Ninja 250
1984 Honda V65 Magna (Favorite)
1982 Kawasaki KZ750E
2005 Suzuki M50
1983 Honda Goldwing Aspencade
2007 Hyosung GT250R
1991 Honda ST1100 (current)

Brendan312

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Re: Fuel and vacuum hoses - help?
« Reply #2 on: May 09, 2018, 11:06:33 AM »

Hey mate, I just wanna know where this one goes:


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Christianleon266

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Re: Fuel and vacuum hoses - help?
« Reply #3 on: May 09, 2018, 11:27:24 AM »

That particular hose connects to the outlet side of the vacuum fuel pump. See the yellow arrow in the image provided.
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2007 Kawasaki KX250F
1984 Yamaha Virago
1982 Honda V45 Sabre
1996 Kawasaki ZX6R
2009 Kawasaki Ninja 250
1984 Honda V65 Magna (Favorite)
1982 Kawasaki KZ750E
2005 Suzuki M50
1983 Honda Goldwing Aspencade
2007 Hyosung GT250R
1991 Honda ST1100 (current)

Christianleon266

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Re: Fuel and vacuum hoses - help?
« Reply #4 on: May 09, 2018, 11:36:08 AM »

The hose that wraps around the carbs that your referencing might be the breather tubes for the bowls. I believe these connect to a port on the airbox, or open air (My bike came without an air box so I do not know where it connects) but certainly not to the outlet of the fuel pump. You'll end up with flooded cylinders.
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2007 Kawasaki KX250F
1984 Yamaha Virago
1982 Honda V45 Sabre
1996 Kawasaki ZX6R
2009 Kawasaki Ninja 250
1984 Honda V65 Magna (Favorite)
1982 Kawasaki KZ750E
2005 Suzuki M50
1983 Honda Goldwing Aspencade
2007 Hyosung GT250R
1991 Honda ST1100 (current)

Brendan312

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Re: Fuel and vacuum hoses - help?
« Reply #5 on: May 09, 2018, 12:04:01 PM »

Wow so I had them the wrong way around.

How do I know if the cylinders are flooded and fix it if needed?

Also, where does the wrap around hose go on your bike? Just nowhere?

Really appreciate the help. Think I might be able to get it going tomorrow (unless Iíve done damage having the fuel hose the wrong way around)
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Christianleon266

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Re: Fuel and vacuum hoses - help?
« Reply #6 on: May 09, 2018, 12:24:43 PM »

If you started the bike and ran it at all with the breather hose as the fuel inlet then it would be wise to change the oil. However, it sounds like you haven't started the bike with the new (or used) carbs you have swapped, so you should be fine. The Carb vent tubes need atmosphere to allow fuel to enter the bowl, and the air that was in its place to leave. My particular bike had the tube routed along the frame rail to behind the engine, and out to the atmosphere, but another member with a complete bike can chime in on if that is the correct location. Hope your initial starting goes well. I'm currently looking for a fuel bowl for my GT250R, until then it sits.
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2007 Kawasaki KX250F
1984 Yamaha Virago
1982 Honda V45 Sabre
1996 Kawasaki ZX6R
2009 Kawasaki Ninja 250
1984 Honda V65 Magna (Favorite)
1982 Kawasaki KZ750E
2005 Suzuki M50
1983 Honda Goldwing Aspencade
2007 Hyosung GT250R
1991 Honda ST1100 (current)

Brendan312

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Re: Fuel and vacuum hoses - help?
« Reply #7 on: May 09, 2018, 12:42:56 PM »

I unfortunately did try and start the bike with the hose that way and actually tried using a little starter fluid which had no effect when it started the bike for 1 second before putting the fuel hose on the breather hose.

Will changing the oil fix the flooded cylinder? Do you reckon it would be safe to finish getting it started before changing it?

Also where abouts are you? Might be able to help with a fuel bowl
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Christianleon266

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Re: Fuel and vacuum hoses - help?
« Reply #8 on: May 09, 2018, 01:08:37 PM »

I might have been a little exaggerative when I said it would flood the cylinders with gas; thats worst case scenario. You would know if it had been flooded because the overflow drains (The small skinny tubes that route in front of the motor to beneath the bike) would be dumping fuel before any flooding took place. It's more of a valid concern if you drive the bike with those hoses connected like that. Pop the oil fill plug open, on the right side of the bike. Does it smell HEAVILY of gas? Has the oil level risen to above what it should be / was at? I live in Arizona, in the US. I was hoping to get one shipped because all of the Hyosung online parts dealers don't have the part that I'm looking for, just the non accelerator pump fuel bowls. No more Arizona Hyosung dealers either.  :(
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2007 Kawasaki KX250F
1984 Yamaha Virago
1982 Honda V45 Sabre
1996 Kawasaki ZX6R
2009 Kawasaki Ninja 250
1984 Honda V65 Magna (Favorite)
1982 Kawasaki KZ750E
2005 Suzuki M50
1983 Honda Goldwing Aspencade
2007 Hyosung GT250R
1991 Honda ST1100 (current)

Christianleon266

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Re: Fuel and vacuum hoses - help?
« Reply #9 on: May 09, 2018, 01:14:39 PM »

Actually, the breathers in this carb setup ARE the overflow tubes. The small tubes connected to the bottom of the carbs are just drain tubes now that I think about it. Even still, the checks I gave you would help you tell if gas had flooded out of the carbs and into the crank case at all. Definitely would not run it or even start it if that is the case.
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2007 Kawasaki KX250F
1984 Yamaha Virago
1982 Honda V45 Sabre
1996 Kawasaki ZX6R
2009 Kawasaki Ninja 250
1984 Honda V65 Magna (Favorite)
1982 Kawasaki KZ750E
2005 Suzuki M50
1983 Honda Goldwing Aspencade
2007 Hyosung GT250R
1991 Honda ST1100 (current)

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