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GS750 carb #2 flowing fuel.

  • Thread starter Thread starter Snowdiver
  • Start date Start date
S

Snowdiver

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'78 GS750. I cleaned the carb float bowls and replaced the FB gaskets. #2 carb still flows fuel out of the drain tube. What did I do wrong. It has a 4 into 1 exhaust and run smooth. It had set for a couple of years outside.

It didn't flow fuel until I took it on its initial road test. Thanks for any and all help. All the needles and floats looked good.
 
Or just give it a good whack, once in a while they get hung up if the carbs are empty of fuel.
Put a stick or something up against the #2 bowl and tap it with a small hammer or something.

If the fuel is still leaking after the engine is shut off, you have a petcock issue.
 
tkent02 said:
Or just give it a good whack, once in a while they get hung up if the carbs are empty of fuel.
Put a stick or something up against the #2 bowl and tap it with a small hammer or something.

If the fuel is still leaking after the engine is shut off, you have a petcock issue.
Click to expand...

The fuel is leaking out of the #2 overflow when it runs and when its turned off. I can't see how this would be the petcock? I hit the carb many times to no avail.
 
No fuel should flow through the petcock unless the engine is running, the fuel valve is shut off by a lack of engine vacuum.

Unless you left it on prime.
 
I would replace the float needles or at least swap them around, double check the float adjustment
 
Snowdiver said:
'78 GS750. I cleaned the carb float bowls and replaced the FB gaskets. #2 carb still flows fuel out of the drain tube. What did I do wrong.
Click to expand...
What did you do wrong? :-k
You only cleaned the bowls, you did not clean the carbs. :eek:

Yeah, there might have been some crud in the bowls, but that's not what gets plugged up to make the carbs not work. As you are finding out first-hand, taking shortcuts while trying to do carb cleaning (or charging system checking) only means that you will be doing it again (and again) until you do the job properly. Please follow the CV Carb Cleaning Guide and you should not have any more problems with your carbs.

.
 
Steve said:
What did you do wrong? :-k
You only cleaned the bowls, you did not clean the carbs. :eek:

Yeah, there might have been some crud in the bowls, but that's not what gets plugged up to make the carbs not work. As you are finding out first-hand, taking shortcuts while trying to do carb cleaning (or charging system checking) only means that you will be doing it again (and again) until you do the job properly. Please follow the CV Carb Cleaning Guide and you should not have any more problems with your carbs.

.
Click to expand...

I did more than cleaned the bowls. It runs great other than the free flowing gas.
 
Possibility of two separate problems, yes. Correct.

1. Free flowing gas out the vent tube means the float is either stuck or not adjusted correctly, or the float needle is stuck in the open position or missing.

2. If it has an OEM petcock and turned to "prime," or if it has an on/off aftermarket petcock it will flow gas in the "on" position when the bike is not running.



How clean is the gas tank? If it has not been cleaned or sealed the problem can become a constant battle. Preference is treatment with POR15.
 
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