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  #21  
Old 07-26-2019, 05:49 PM
nograin's Avatar
nograin nograin is offline
304 AMC
 
Join Date: Dec 19, 2000
Location: Philadelphia, Pa., USA
Posts: 2,037
There's only three ways that stuff can get into the bowl.
The fuel feed which must go through the inlet valve. Anything under 30 microns or smaller will be picked up in the filter. Go ahead, cut it open. I did.
The bowl vents open to the air cleaner. - The top gasket will stop or at least pick up some of what ever 'it' is that made it past the air filter.
The bowl vent connected to the charcoal canister. That too should show as some deposits on the top gasket. Unlike the main vent, the only filter is the foam. In theory there is no reason for charcoal to move to the bowl. reality is that when the check valve fails, the bowl is at lower pressure than atmosphere and some charcoal will migrate. Take off the vapor seperator and flush it. If a bunch of charcoal comes out - there's your evidence.

Fixing the solenoid valve - no fun. I don't have a good easy solution.
Replacing the foam. Really not a hard job.
Not sure what cannister '91 rigs got. It may look like like the one TWMattox shows in the rebuild thread linked. Or it may be yet another version and maybe that is still available.
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'85 Grand Wagoneer
360 727auto, NP229
body by beer (PO)
carries wood inside
no "wood" outside
My other car is a fish

Last edited by nograin : 07-26-2019 at 05:55 PM.
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  #22  
Old 07-27-2019, 08:19 AM
GWJeeper GWJeeper is offline
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Join Date: Mar 28, 2019
Location: Oklahoma
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Nograin, When I first worked on the carb a few weeks ago I installed a new fuel filter, I think I'll take your advice and sacrifice that filter to see what might be coming in via the fuel supply line. Between the external filter and the small filter screen under the needle and seat it's hard to see how anything could get into the bowl from that source, but who knows
As to the vent line to the charcoal canister, so far I haven't found a source for a new vapor separator so I'll try flushing the one on the car and see what turns up. If it contains charcoal bits I wonder if installing a filter or screen in the line might stop charcoal from making it's way into the carb. Either that or eliminate the charcoal canister completely ( I live in a state with no emission regs to deal with).
I'm really new to the 2150 carburetor world but I wasn't aware that there is another vent to the air cleaner, is that feature on all year GWs or am I not seeing what I'm looking at? Thanks for your input, it's appreciated
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  #23  
Old 07-27-2019, 07:24 PM
GWJeeper GWJeeper is offline
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Join Date: Mar 28, 2019
Location: Oklahoma
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This the results of cleaning the vapor separator and its hoses. No wonder I'm having trouble with debris entering the fuel bowl. I flushed the separator with carb cleaner and blew compressed air through the scrubbed the inside with a bore brush. I replaced all of the hoses, so now we'll see if that stops the problem from recurring


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Sorry for the crappy photo, I'm learning how to post photos to this forum, the shiny item in the photo is a razor blade to give scale to the crud that came out of the separator
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2000 TJ
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  #24  
Old 07-27-2019, 08:08 PM
nograin's Avatar
nograin nograin is offline
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Join Date: Dec 19, 2000
Location: Philadelphia, Pa., USA
Posts: 2,037
Quote:
Originally Posted by GWJeeper
This the results of cleaning the vapor separator and its hoses. No wonder I'm having trouble with debris entering the fuel bowl. I flushed the separator with carb cleaner and blew compressed air through the scrubbed the inside with a bore brush. I replaced all of the hoses, so now we'll see if that stops the problem from recurring


Attachment 15644

Sorry for the crappy photo, I'm learning how to post photos to this forum, the shiny item in the photo is a razor blade to give scale to the crud that came out of the separator

heh. You managd to attach a photo. The capability to attach photos is very limited.
I have 3 or 4.
The main way to show photos is host them elsewhere and then link to the photo. Flickr is currently a favorite hosting service.

Follow the link to the Charcoal canister rebuilds. Its not that difficult. Only challenge is cutting the seam neatly.
__________________
'85 Grand Wagoneer
360 727auto, NP229
body by beer (PO)
carries wood inside
no "wood" outside
My other car is a fish
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  #25  
Old 07-27-2019, 08:21 PM
nograin's Avatar
nograin nograin is offline
304 AMC
 
Join Date: Dec 19, 2000
Location: Philadelphia, Pa., USA
Posts: 2,037
Quote:
Originally Posted by GWJeeper
Nograin, When I first worked on the carb a few weeks ago I installed a new fuel filter, I think I'll take your advice and sacrifice that filter to see what might be coming in via the fuel supply line. Between the external filter and the small filter screen under the needle and seat it's hard to see how anything could get into the bowl from that source, but who knows
As to the vent line to the charcoal canister, so far I haven't found a source for a new vapor separator so I'll try flushing the one on the car and see what turns up. If it contains charcoal bits I wonder if installing a filter or screen in the line might stop charcoal from making it's way into the carb. Either that or eliminate the charcoal canister completely ( I live in a state with no emission regs to deal with).
I'm really new to the 2150 carburetor world but I wasn't aware that there is another vent to the air cleaner, is that feature on all year GWs or am I not seeing what I'm looking at? Thanks for your input, it's appreciated

Kennedy American had some of the seperators. But there's really nothing to them internally so if you flush it out, it will be fine.

Two vents:
Most factory carbs from early 70s up have a second vent for capturing vapors when the engine isn't running. The main vent when running is the same as a pre-emmissions carb. Just a hole or tube to a point inside the air cleaner. Although we call it a vent - the real function is to maintain the bowl at atmospheric pressure. Some carbs run into the air flow - so these increase pressure with increasing flow. But Holleys and Autolites/Motorcraft carbs are meant to keep constant pressure.

Pressure in the bowl is how a carb moves fuel toward the engine.
At lower engine speeds the fuel moves toward the low pressure under the throttle blade(s).
At higher engine speeds, the fuel moves toward the low pressure created at the booster in the venturi.
If you like diagrams, I posted one here:
http://www.ifsja.org/forums/vb/showp...8&postcount=27
__________________
'85 Grand Wagoneer
360 727auto, NP229
body by beer (PO)
carries wood inside
no "wood" outside
My other car is a fish

Last edited by nograin : 07-27-2019 at 08:32 PM.
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