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GS 650 barely idling

  • Thread starter Thread starter Mop Bucket
  • Start date Start date
It is a good result if you are not getting any fuel flow with the tube in place on PRIME or RUN and the bike is not running IF the carb bowls are already full. That means your floats are working properly.

My question is:how do you know there is no fuel flowing? Are you removing the fuel line from carburetors and letting it drain back into a gas can?

Does it flow when the tubing is not connected to the carbs, but is connected to the petcock (i.e. open at the downstream end)?
 
BigD_83 said:
It is a good result if you are not getting any fuel flow with the tube in place on PRIME or RUN and the bike is not running IF the carb bowls are already full. That means your floats are working properly.

My question is:how do you know there is no fuel flowing? Are you removing the fuel line from carburetors and letting it drain back into a gas can?

Does it flow when the tubing is not connected to the carbs, but is connected to the petcock (i.e. open at the downstream end)?
Click to expand...

With the gas tank hooked up to the carbs, no fuel flows at all. I have a clear gas line on the bike. No fuel flows with the bike running either.

If I take the tank off and turn it to prime, it flows great. I don't get it.
 
Mop Bucket said:
With the gas tank hooked up to the carbs, no fuel flows at all. I have a clear gas line on the bike. No fuel flows with the bike running either.

If I take the tank off and turn it to prime, it flows great. I don't get it.
Click to expand...
On my 650, I can't really see the fuel flowing unless there is an air bubble in the line...

If you leave it hooked up to the petcock and the carbs, does the engine die out on you?

Someone ought to be along shortly with a markedly pointed solution.

EDIT- wait a minute: with the tank ON the bike it doesn't flow, but with the tank OFF the bike, fuel flows through the tubing? That sounds like a kink in the line, or a low spot. Do you have pictures of the setup on the bike?
 
Last edited:
BigD_83 said:
On my 650, I can't really see the fuel flowing unless there is an air bubble in the line...

If you leave it hooked up to the petcock and the carbs, does the engine die out on you?

Someone ought to be along shortly with a markedly pointed solution.

EDIT- wait a minute: with the tank ON the bike it doesn't flow, but with the tank OFF the bike, fuel flows through the tubing? That sounds like a kink in the line, or a low spot. Do you have pictures of the setup on the bike?
Click to expand...

The bike does die after all the fuel runs out of the floats. I use my temp tank to prime the line. The fuel line goes directly into the carbs, no kinks. I am setup like stock except the fuel line is clear. My temp tank is basically a big funnel. I am wondering if the pressure of my temp tank is forcing the gas to flow. I?m heading to the store to get a funnel that will fit in the fuel line. This will let me know if there is some sort of clog or something since it will be less pressure.

Temp tank

IMAG0353-1.jpg


Lines quickly connected to gas tank

IMAG0340-1.jpg


Lines going to carb

IMAG0346-1.jpg
 
Hi,

Are you familiar with the operation of a vacuum petcock? Your petcock should have a fuel line and a vacuum line attached. In RUN or RES, your petcock should not let fuel flow unless the engine is running and providing vacuum. As soon as the engine is turned off, no vacuum, no fuel flow. The PRIme setting will allow fuel to flow via gravity whether the engine is running or not.

If your petcock flows in PRI, but not ON or RES when the engine is running, I would suspect the petcock, or a bad vacuum hose/fitting/connection.

The vacuum line should be plugged when running from an aux tank.


Thank you for your indulgence,

BassCliff
 
BassCliff said:
Hi,

Are you familiar with the operation of a vacuum petcock? Your petcock should have a fuel line and a vacuum line attached. In RUN or RES, your petcock should not let fuel flow unless the engine is running and providing vacuum. As soon as the engine is turned off, no vacuum, no fuel flow. The PRIme setting will allow fuel to flow via gravity whether the engine is running or not.

If your petcock flows in PRI, but not ON or RES when the engine is running, I would suspect the petcock, or a bad vacuum hose/fitting/connection.

The vacuum line should be plugged when running from an aux tank.


Thank you for your indulgence,

BassCliff
Click to expand...

I have a weird one here. With the gas tank connected and set to prime there is zero gas flow. If I pull the gas line while the tank is connected my hand gets covered in gas, ask me how I know.

To summerize, if I connect my tank to the fuel line and turn it to prime, no fuel flows. If I unhook the petcock and turn it to prime, the fuel flows. If I hook up my aux tank, gas flows to the carbs and it runs. (super happy about the running part!)
 
Well, got it all sorted out. Thanks to everyone. Happy riding and have a great Thanksgiving!
 
I think that the gas was trickling so slowly I couldn't see it going down the tube. I let it run for 5ish minutes and it never died with the choke on. I rode it around the block and it ran fine. The tube was full of gas when I got back. Not positive it is fixed completely since it died while riding around on a longer ride, but it could have died because it flooded.

Patience I guess is what fixed it
 
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