Quick fuel leak?? Opinions please - Rolls-Royce and Bentley Forums
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post #1 of 11 (permalink) Old 01-25-2017, 08:49 PM Thread Starter
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Quick fuel leak?? Opinions please

Hi All,

So once again Gracie throws a bug in my cereal!!

I've been starting her regularly and trying to drive her when possible and the weather allows- side note: Carbs were just rebuilt...any how, I went to start her today and she started right up and ran brilliantly, suddenly, I smell a little gas, I look under and sure enough there is a small-ish drip coming out of the overflow, I revved the engine a bit to try and get some fuel flowing through the carbs and the overflow stopped, I am assuming that maybe some little piece of s**t might have passed through and caused a float needle situation but only temporary and cleared itself.

Also, what is that, for lack of a better term, filter looking gizmo on the overflow, I have attached a pic that I found on someone else's posting of it, wondering what that is all about.
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"Gracie"
1979 SSII
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post #2 of 11 (permalink) Old 01-25-2017, 09:32 PM
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See Chapter K5 of the workshop manual. That's the one-way drain valve for, as you've already figured out, the float chamber. It's function is described on page K5-32 and a diagram including it is on K5-33.

Brian

The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth.
~ Niels Bohr


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post #3 of 11 (permalink) Old 01-26-2017, 05:45 AM
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"Carbs were just rebuilt..."

What did they do exactly ? Are you sure they replaced the 2 flotters ?
On Shadow II those flotters are in plastic and with time gas could go inside...

It could be normal also, just an excess of gas in the carburetor.

Study if it does it at each cold start ofr ex.

Jean

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post #4 of 11 (permalink) Old 01-27-2017, 08:31 PM Thread Starter
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I see, so its a check valve...makes sense.

I am not really sure what the carb "rebuild" included, but she has been running absolutely great, maybe this was just a small glitch which has cured itself at least for now...I will be keeping an eye on it.

Thanks for your replies

Jon

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post #5 of 11 (permalink) Old 01-28-2017, 02:41 AM
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Hi


Sounds to me pretty much what you suspect a stuck valve allowing the float chamber to overflow,I would be tempted to change the fuel filter to be on the safe side


john

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post #6 of 11 (permalink) Old 01-28-2017, 05:03 AM
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I don't remember if SS II have the 2 little pre filter just before the SU.
If yes, were they replaced ? In any case agree with motorman they should

In any case, I remember it happens few times to me on my SSII and specialist told me it may happen if you don't use it regularly and there is too much gas in the sytem.
But it should not happen every day/week

Jean

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post #7 of 11 (permalink) Old 01-28-2017, 08:10 AM Thread Starter
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Hi all,

I was thinking the same thing about the two "pre-filters", Not sure if they were replaced, I will order them and replace them...I think that will help prevent this, for all I know they may have never been changed.

Jon

"Gracie"
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post #8 of 11 (permalink) Old 01-28-2017, 08:28 AM
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I had an issue with the o-rings between the pre-filter housing and the carbs drying out -- but that leaked petrol directly below the carbs.

Still, worth checking them when you change out the pre-filters....

Cheers,
Jeff.
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post #9 of 11 (permalink) Old 01-28-2017, 10:38 AM
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Not that I think that filter replacement is going to solve the issue you're having (unless the filter itself is breaking down, which is unlikely) but you may be interested in the thread I posted on the Australian Forums entitled, Replacing the Carb Fuel Filter in Photos. URL: http://au.rrforums.net/forum/messages/17001/15656.html

Brian

The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth.
~ Niels Bohr



Last edited by guyslp; 01-28-2017 at 10:42 AM.
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post #10 of 11 (permalink) Old 01-28-2017, 03:37 PM Thread Starter
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Hi Jeff,

I have already replaced all of those O-rings, there are 2 on each, I had the same leak as well.


Hi Brian,

I will read your posting and thank you for the link.


Jon

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