V4 115 carbs have fuel dripping from carb throat while running

[Oliverct]

Thank you for the clarification guys. I actually have a spare carb that I've been harvesting parts from so I will go and see if the floats in that carb match the floats in my "running" carbs.

I did try turning the carbs upside down and blowing air into the fuel inlet, I found that they held pressure pretty well, as long as I didn't blow to hard.

I'll report back shortly.

Oliver

[TownsendsFJR1300]

Plus 1 ^^.

I should clarify, the seam on the float, with the float CLOSED(up all the way), should be (IN GENERAL) about PARALLEL with the carb body float bowl EDGE..

If the needle isn't even seating fully, it seems the floats may be incorrect..

.You being able to "primer bulb squeeze" fuel past the needle and flood the carbs does indicate lack of sealing or as noted above, improper floats

In the FSM, the 16 mm float level is from the SEAM of the float to either the carb body edge OR the carb body edge WITH the float gasket. Either will be very close to function properly..


*As the engine is "new" to you and always had the issue, don't expect everything in the carb to be correct/original.. Someone's likely dinked inside it and changed parts. Suspect EVERYTHING..


.

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[zenoahphobic]

On a second look, the right float is resting on something. I wonder if they have been swapped. It seems that float would need a cutout to clear that bump, if it was meant to rise that far into the top, like the left one appears to be doing??

[zenoahphobic]

Hi Zenoahphobic,

Thank you for the insights. If I'm understanding your comments correctly, you're saying that the floats fall to deeply into the top of the carb when I have then turned upside down?

This would then mean that the floats are rising too high inside the bowls when they fill with fuel?

Thanks
Oliver

Correct.
I’m guessing that by looking at the last photo (problem with Forums is that we can’t be there in person to see). You haven’t placed the right float back with it’s hinge pin; that would have shown if that float has fallen too “deeply”, as you phrased it, as well.

[Oliverct]

Hi Zenoahphobic,

Thank you for the insights. If I'm understanding your comments correctly, you're saying that the floats fall to deeply into the top of the carb when I have then turned upside down?

This would then mean that the floats are rising too high inside the bowls when they fill with fuel?

Thanks
Oliver

[zenoahphobic]

Well that says it - primer bulb should go hard (almost impossible to apply more pressure to go past a properly seated needle.
Judging from the picture the properly installed float appears to be too far in (down, in respect to picture)
I suspect the stainless steel hinge has had it,s wings bent down too far. This seems to have been done to set the float height (incorrectly).I think this was done without thinking what happens to the needle.
As both seem the same, and both leak, this is exactly what I,d be looking at. Someone may tell you where to where 16mm is, I don’t, but the float should look level when upside down in the picture, and not sink so deeply into the top.

[Oliverct]

Hey TownsendsFJR1300,

Thanks for the reply. I have a FSM and it directs me to set the floats at 16mm. The problem is, I'm not totally sure "where to where" I should be taking the measurement.

Based on the fact that the I can literally flood the carbs by squeezing the primer bulb, I believe that the floats/needles are malfunctioning causing the needle to not seat and thus letting the fuel continue to flow into the carbs.

I don't have a vacuum pump but I will try holding the carbs upside down and bowing air into the carbs.

Oliver

[TownsendsFJR1300]

It's kinda hard to tell by the pic's posted but the float "seam" generally needs to be even with the carb body with the floats closed.
Obviously setting the floats PROPERLY at the specified spec's are best...

To rule out (or in) the seats leaking, you can take a vacuum gauge (I use a Mity Vac brake bleeder tool), hook it to the
carb fuel nipple. With the floats closed, you should be able to pull a vacuum (seat and pin ARE sealing). If not, the pin/seat are leaking.


Also, holding the carb upside down (float /needle closed), you should NOT be able to blow air (just by yourself) thru the fuel line nipple. If you can, you have sealing issues..

Might want to also check that the floats are NOT leaking or absorbing fuel(making them open). Dunk in a small container overnight and check in the am that their not full of fuel.

[Oliverct]

Hey everyone,

I'm working on a project boat that was "running" terribly when I got it. It now ideals OK, but fuel litterally floods out of the bottom of each carb throat. I believe that the needle valves are not being close shut by the floats, causing fuel to pump through the bottom of each carb throat.

I've attached a few picture of how I have the carbs set up because I'm at a complete loss for where I've gone wrong... I don't really understand how the needles are not stopping the fuel flow.

Note: I rebuilt the carbs with new parts, including needles.

Thanks,
Oliver

https://drive.google.com/open?id=1pb...9JTnmhWmfMXOzJ

https://drive.google.com/open?id=1gW...uPlWYTmgqKaFYO

https://drive.google.com/open?id=1ax...ZqHfJB6gw_4mBw