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  #1   IP: 71.181.37.53
Old 09-23-2010, 12:57 PM
ArtJ ArtJ is offline
 
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Carburetor Main passage bleeder

I would like to see a method of bleeding the main passage on the carburetor
using a permanently installed fitting which would replace the main passage plug and permit
bleeding of the carburetor in a emergency with a hot engine without the
risk of gasoline fumes causing danger of fire or explosion.

The main passage plug would be refitted with a adapter which was normally
closed, but could be opened to a hose barb fitting which via a piece of hose
connects to a second fuel water separator, or similar device.

In this way, the carb could be bleed in a emergency without having to
deal with a hot engine and potential fire.

The separator could be emptied even days later at a safe and convenient
time.

Thanks
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  #2   IP: 173.166.26.241
Old 09-23-2010, 01:55 PM
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hanleyclifford hanleyclifford is offline
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Art - I think this is what you have in mind. It would be necessary to rethread the carb body for 1/8" NPT. If you like it I'll get the McMaster number. Regards, Hanley

Last edited by hanleyclifford; 07-13-2016 at 08:36 PM.
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  #3   IP: 71.181.37.53
Old 09-23-2010, 02:23 PM
ArtJ ArtJ is offline
 
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Hanley you are truly amazing. The things you can come up with astound.

The picture is not entirely clear. Which parts are necessary? The picture
does not appear to be a carburetor installation.

Thanks!

Art
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  #4   IP: 71.181.37.53
Old 09-23-2010, 02:29 PM
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On a second glance, it appears that only the "faucet" part is required,
along with a adapter of some sort? from its lower threaded part to a hose barb.

Is this correct? I would love the McMaster Carr part nos.

Thanks again

Art
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  #5   IP: 71.181.37.53
Old 09-23-2010, 02:40 PM
ArtJ ArtJ is offline
 
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Hanley Do you think there would be sufficient clearance to retap the passage without disturbing
the main jet or its seat?

Regards,

Art
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  #6   IP: 173.166.26.241
Old 09-23-2010, 02:50 PM
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hanleyclifford hanleyclifford is offline
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Art - I am actually using the valve as a block coolant drain. The McMaster number is 5049K1. Go to their catalogue and you might see something even better for your proposed application. I see no problem tapping out that hole but I have never tried it. Do you have an old carb body to practice on? Regards, Hanley BTW Thanks for motivating me to take that picture - notice the small antifreeze leak!

Last edited by hanleyclifford; 09-23-2010 at 02:59 PM. Reason: addition
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  #7   IP: 71.181.37.53
Old 09-26-2010, 02:45 PM
ArtJ ArtJ is offline
 
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Hanley

I see 3/8 street Ells in MMI catalog,, 45 deg, 90 deg.

Could these be put into the straight 3/8 threaded passage directly
then fitted out with a standard hose barb? It seems everything would
just thread together?

Regards

Art
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  #8   IP: 173.9.105.253
Old 09-26-2010, 03:38 PM
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Question

Art - Remember the 3/8" NPT refers to the ID of the passage whereas in NF the number is close to the OD of the fitting. The carb can be opened to 1/8" NPT and then any combination can be used including the short pipe set up I posted. How about using an additional Racor unit as your reservoir with a McMaster's valve on top? - Regards, Hanley
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  #9   IP: 71.181.37.53
Old 09-26-2010, 03:50 PM
ArtJ ArtJ is offline
 
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Thanks Hanley

I am getting more educated all the time. Just made a trip to Home Depot

The closest I could get was the following:

A 1/8 x 1/8 street Ell to a 1/8 nipple to a 1/8 x 1/4 reducer to a 1/4 hose barb. Longer than I would like, approx 3 ", due to reducer and nipple before barb, but possible.

Doesn't Moyer carry a barb to 1/8 NPT male that threads directly into
the carb for Electric pump usage? Maybe that could be used into the
passage block after tapping to 1/8 NPT.

Thanks again


Art
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  #10   IP: 71.181.37.53
Old 09-26-2010, 04:13 PM
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hanley

It looks like the Best option could be the below from MMI catalog?

Brass hs brb 1/8" MNPT x 5/16" barb 90

the carb passage would be directly addressed after tapping.
with the above fitting


I think the Fuel water separator takes 1/4" barbs, so maybe more adapting on that end to get to 1/4 "? or possibly force 1/4 hose onto 5/16 barb?

Then just add in line valve near Racor as you suggest.

Regards,

Art
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  #11   IP: 173.9.105.253
Old 09-26-2010, 04:20 PM
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Now the remaining issue becomes getting an overboard vent line to the other side of the Racor.
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  #12   IP: 71.181.37.53
Old 09-26-2010, 05:47 PM
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Another thought

If the Shutoff is located at the racor filter, possibly several ft away from the
passage drain port, potentially, the fresh trapped fuel could be subject to later becoming stale over time and via back flow reenter the carb passage and possibly foul the jet again?

Perhaps this is a reason
to have the shutoff valve located closer to the carb main passage keeping
the quantity of fuel trapped at a minimum. or certainly bleed this line
periodically.


Maybe locate the shut off valve closer possibly where the mechanical
pump originally was?

Regards

Art
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  #13   IP: 173.10.248.102
Old 11-21-2010, 04:45 AM
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go sailing

ever hear of K.I.S.S. why keep adding more things to go wrong
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  #14   IP: 71.168.64.77
Old 11-21-2010, 07:28 AM
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This post was about the passage plug availability, nothing more.

The reason for the earlier attempt was to compensate for a shutdown issue
on trips when the engine was hot and carb could not be bleed
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  #15   IP: 38.102.16.169
Old 11-21-2010, 09:11 AM
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The main passage plug and washer are now listed in the online catalog. Look here.
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