Fuel coming out of carb overflow 95 900rr - Honda Motorcycles - FireBlades.org
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post #1 of 13 Old 03-08-2011, 7:45 AM Thread Starter
 
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Fuel coming out of carb overflow 95 900rr

Howdy all. I've never had the problem before so I'm stumped. I had a coil go bad so I replaced the coil and the bike started running better but then I had fuel start to come our of the Carb overflow line. Its not just a trickle but almost a stream of fuel under a little bit of pressure. I took the bowls off and inspected the bowls and jets and they appear to to be clean as I didn't see anything as far as foreign debris. What would cause this problem?
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post #2 of 13 Old 03-08-2011, 8:28 AM
 
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Re: Fuel coming out of carb overflow 95 900rr

I assume this happened to only one of the four carbs. You are in the right area in the float bowl. It's no different basically than a toilet tank. If the float isn't broken or fuel saturated, as it floats up it lifts a needle valve up onto a seat to stop fuel flow.

My guess is some debris got into that tiny area when you had the tank off for the coils. It may run through or the needle valve may have to be removed to clean better.
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post #3 of 13 Old 03-08-2011, 8:41 AM
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Re: Fuel coming out of carb overflow 95 900rr

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Originally Posted by ArmySkyDiver View Post
Howdy all. I've never had the problem before so I'm stumped. I had a coil go bad so I replaced the coil and the bike started running better but then I had fuel start to come our of the Carb overflow line. Its not just a trickle but almost a stream of fuel under a little bit of pressure. I took the bowls off and inspected the bowls and jets and they appear to to be clean as I didn't see anything as far as foreign debris. What would cause this problem?

Diaphram in the fuel tap is torn.

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post #4 of 13 Old 03-08-2011, 12:33 PM Thread Starter
 
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Re: Fuel coming out of carb overflow 95 900rr

Blade can you explain that a little more?
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post #5 of 13 Old 03-08-2011, 2:14 PM
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Re: Fuel coming out of carb overflow 95 900rr

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Originally Posted by ArmySkyDiver View Post
Blade can you explain that a little more?

My mistake, '95 doesn't have the vacuum-operated fuel tap.
Is part #34 vacuum-operated?
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post #6 of 13 Old 03-08-2011, 2:33 PM Thread Starter
 
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Re: Fuel coming out of carb overflow 95 900rr

Rhere are diaphragms on the top of each Carb. Is that what you're referring too/)?
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post #7 of 13 Old 03-08-2011, 2:55 PM
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Re: Fuel coming out of carb overflow 95 900rr

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Rhere are diaphragms on the top of each Carb. Is that what you're referring too/)?

No. Those are operated by air flow through the carbs.
A fuel tap that is opened by vacuum from the engine will suck neat fuel into the cylinder if the diaphram fails.

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post #8 of 13 Old 03-08-2011, 3:26 PM Thread Starter
 
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Re: Fuel coming out of carb overflow 95 900rr

Ok so if my carbs don't have them then what would cause the problem I'm having??
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post #9 of 13 Old 03-08-2011, 5:02 PM
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Re: Fuel coming out of carb overflow 95 900rr

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Ok so if my carbs don't have them then what would cause the problem I'm having??

As I said, Part #34 in the fiche appears to be vacuum-operated but I don't know what it is.

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post #10 of 13 Old 03-08-2011, 6:09 PM
 
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Re: Fuel coming out of carb overflow 95 900rr

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Diaphram in the fuel tap is torn.
Even if it were blade, would not the floats still prevent any fuel to continue to flow. All the vacuum operated fuel valve does is insure the fuel supply is turned off when the engine is not running.
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post #11 of 13 Old 03-09-2011, 12:52 AM
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Re: Fuel coming out of carb overflow 95 900rr

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Originally Posted by denzee View Post
Even if it were blade, would not the floats still prevent any fuel to continue to flow. All the vacuum operated fuel valve does is insure the fuel supply is turned off when the engine is not running.


The problem is, if the diaphram is torn the engine vacuum sucks fuel directly from the tank into the engine completely bypassing the carburetor.

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post #12 of 13 Old 03-09-2011, 12:58 AM
 
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Re: Fuel coming out of carb overflow 95 900rr

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The problem is, if the diaphram is torn the engine vacuum sucks fuel directly from the tank into the engine completely bypassing the carburetor.
I understand that but he said carb overflow line. Guess more info is needed. Cheers!
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post #13 of 13 Old 03-09-2011, 1:01 AM
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Re: Fuel coming out of carb overflow 95 900rr

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Originally Posted by denzee View Post
I understand that but he said carb overflow line. Guess more info is needed. Cheers!


Sorry Den, I was very tired last night :-)
If the fuel is coming through the overflow then I'd definately be looking at the float valve as you said.

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