Home » Public Forums » GMCnet » [GMCnet] Don't assume that the carb filter is clean because you have a filter at the rear
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| Re: [GMCnet] Don't assume that the carb filter is clean because you have a filter at the rear [message #322536 is a reply to message #322519] |
Wed, 23 August 2017 09:14   |
Richard Denney
Messages: 920
Registered: April 2010
Karma: 9
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Senior Member |
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Bob, had you replaced the filter when you first installed the external
filter? Seems obvious, but it's a mistake I have made.
I removed the carb filter altogether, and replaced it with an AN-6 adapter.
I then run aircraft hose from there to a compressing AN-6 fitting on the
steel line down at the front crossmember. (I bypassed the mechanical pump,
which is now just a block-off plate, and run an electric pump in the rear
by the tank.) In that aircraft hose, I installed an AN-6 sintered-bronze
filter as a failsafe. I didn't want to see the effects of a degrading hose
between the inline filter back by the tank and the carb in the interior of
the carb, so I have that last-ditch filter. The sintered-bronze filter is
not, I don't think, finer than the paper filter in the back, but it will
catch the stuff I'm protecting against. I have not checked it since I
installed it.
Rick "wrapped in foil-covered insulation" Denney
On Wed, Aug 23, 2017 at 12:35 AM, Bob Dunahugh wrote:
> I did. WRONG. Every now, and then I'd look at my clear gas filter that is
> between the tank, and my rear electric pump. It's always been clean. Two
> weeks ago I had a terrible time getting home. Pulled the carb filter
> tonight. That filter was almost clogged. Bob Dunahugh 78 Royale
> _______________________________________________
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--
'73 X-Glacier 230 "Jaws"
Northern Virginia
Offlist email: rick at rickdenney dot com
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| Re: [GMCnet] Don't assume that the carb filter is clean because you have a filter at the rear [message #322541 is a reply to message #322535] |
Wed, 23 August 2017 11:24 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Never run w/o the small filter at the carb.
That is the final protection to keep crud out of the carb.
I have run lot of Quadra Jet carbs w/o them and suffered the consequence.
Having an aux. filter by the pump is a good concept as it not only filters,
but it will not contribute to vapor lock.
On Wed, Aug 23, 2017 at 7:05 AM, Wayne Rogewski wrote:
> Cut it open with a razor blade and fan out the paper element, See if
> there is any crud in it.
> --
> 77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson
> carb and dizzy.
> Mid Michigan
>
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
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jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Don't assume that the carb filter is clean because you have a filter at the rear [message #322542 is a reply to message #322519] |
Wed, 23 August 2017 11:39 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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KEEP BOTH filters installed. I one time drove a coach from California to Ohio. It had some rust in the tanks. The inline Wix filter filled up and had to be replaced every second day. At the same time the carb filter clogged had also had to be replaced every second day. They always clogged on opposite days. I went through 6 filters filters on the trip changing one or the other every day.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Don't assume that the carb filter is clean because you have a filter at the rear [message #322551 is a reply to message #322535] |
Wed, 23 August 2017 13:06 |
kstockwell
Messages: 367
Registered: May 2016
Location: Putney VT
Karma: 4
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Senior Member |
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I hope i didn't throw it away yet...
Not sure why I didn't think of that. I did bring it to the autoparts store to make sure I got the right one. And then I ordered the nylon washers online since no one around here stocks them. I put the warped one back in, no leaks- fingers crossed.
the new ones arrive today so I'll have them with me in case I need them
-k
77Royale wrote on Wed, 23 August 2017 10:05Cut it open with a razor blade and fan out the paper element, See if there is any crud in it.
1978 Kingsley
Putney VT
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| Re: [GMCnet] Don't assume that the carb filter is clean because you have a filter at the rear [message #322552 is a reply to message #322550] |
Wed, 23 August 2017 13:10 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Just a small matter of microns. The carb inlet filter will stop particles
as small as 5 microns. That pretty much includes everything including muddy
water. The upstream in-line filters for the most part are 20 micron. So
some of the really small stuff will pass through them. If you remove the
inlet filter, those small particles will eventually will coat stuff like
floats and inlet needles, and metering rods, and that piston that works in
conjunction with the secondary flap, delaying it from opening. GM would not
have put a filter there if it was not needed.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Aug 23, 2017 10:58 AM, "Bob Dunahugh" wrote:
> I took the tanks, rear filter/electric pump, and carb with existing filter
> off the burned GMC. Didn't check the carb filter. As the rear clear filter
> was clean inside. Then installer all these items on this next 78 Royale. I
> pulled the carb filter out. And I could hardly blow threw it. Then cut it
> open. The filter just had a dark tint on it. Bob Dunahugh
>
>
> ________________________________
> From: Bob Dunahugh
> Sent: Tuesday, August 22, 2017 11:35 PM
> To: gmclist@list.gmcnet.org
> Subject: Don't assume that the carb filter is clean because you have a
> filter at the rear
>
>
> I did. WRONG. Every now, and then I'd look at my clear gas filter that is
> between the tank, and my rear electric pump. It's always been clean. Two
> weeks ago I had a terrible time getting home. Pulled the carb filter
> tonight. That filter was almost clogged. Bob Dunahugh 78 Royale
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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| Re: [GMCnet] Don't assume that the carb filter is clean because you have a filter at the rear [message #322574 is a reply to message #322572] |
Wed, 23 August 2017 18:04 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Kelly,
That carb filter works opposite of most, so you need to cut it open to see
the buildup of particulets in the filter.
That is one item I carry in my coach, as it is small and does not take up
space and light.
On Wed, Aug 23, 2017 at 3:55 PM, kelly stockwell wrote:
> it looks like my carb filter is leaking, so I'll pull it and put in a new
> washer.
> I did toss the old one so I don't know if it's dirty. Next time I'll check
>
> -k
> --
> 1978 Kingsley
> Putney VT
>
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Don't assume that the carb filter is clean because you have a filter at the rear [message #322582 is a reply to message #322574] |
Wed, 23 August 2017 21:06 |
kstockwell
Messages: 367
Registered: May 2016
Location: Putney VT
Karma: 4
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Senior Member |
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I bought two!
jimk wrote on Wed, 23 August 2017 19:04Kelly,
That carb filter works opposite of most, so you need to cut it open to see
the buildup of particulets in the filter.
That is one item I carry in my coach, as it is small and does not take up
space and light.
On Wed, Aug 23, 2017 at 3:55 PM, kelly stockwell wrote:
> it looks like my carb filter is leaking, so I'll pull it and put in a new
> washer.
> I did toss the old one so I don't know if it's dirty. Next time I'll check
>
> -k
> --
> 1978 Kingsley
> Putney VT
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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1978 Kingsley
Putney VT
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| Re: [GMCnet] Don't assume that the carb filter is clean because you have a filter at the rear [message #322587 is a reply to message #322550] |
Wed, 23 August 2017 23:34 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Jim I did 3 complete filter changes in 6 day and on each change I progressively more miles be for it clogged again. So yes it as getting better. It was not my coach and I do not think that the owner pulled the tanks after I delivered it. I think he did just what you suggested. Keep changing filters until it cleared up. That big Wix filter that you sell installed just before the fuel pump was a life saver on that trip. It caught most of the stuff and the carb filter caught what smaller stuff got through. I was fighting rust and not gooey crap in the tank.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Don't assume that the carb filter is clean because you have a filter at the rear [message #322588 is a reply to message #322587] |
Thu, 24 August 2017 00:10 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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The only large Hi Capacity filter to use is the WIX 33161.Other brands have
very little media, that it plugs up right away. I seldom endorse WiX, but
for this application, other brands are only half the media so the dirt
holding capacity is poor.
On Wed, Aug 23, 2017 at 9:34 PM, Ken Burton wrote:
> Jim I did 3 complete filter changes in 6 day and on each change I
> progressively more miles be for it clogged again. So yes it as getting
> better. It
> was not my coach and I do not think that the owner pulled the tanks after
> I delivered it. I think he did just what you suggested. Keep changing
> filters until it cleared up. That big Wix filter that you sell installed
> just before the fuel pump was a life saver on that trip. It caught most of
> the stuff and the carb filter caught what smaller stuff got through. I
> was fighting rust and not gooey crap in the tank.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Don't assume that the carb filter is clean because you have a filter at the rear [message #322590 is a reply to message #322588] |
Thu, 24 August 2017 01:09 |
Guy Lopes
Messages: 499
Registered: April 2004
Location: Sacramento, CA
Karma: 3
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Senior Member |
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Jim, I always try to listen closely to people who know much more about a
subject than I do. Considering you're the filter engineer, I have now placed
this filter on my "to buy" list. Thanks!
Guy "I love Rick Denny's quotes within his name" Lopes
1976 ish RB Birchaven
Sacramento, CA
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Jim
Kanomata
Subject: Re: [GMCnet] Don't assume that the carb filter is clean because you
have a filter at the rear
The only large Hi Capacity filter to use is the WIX 33161.Other brands have
very little media, that it plugs up right away. I seldom endorse WiX, but
for this application, other brands are only half the media so the dirt
holding capacity is poor.
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Guy Lopes
76 Birchaven "Orion"
Sacramento, CA
W6TOL
www.GMC-Guy.com
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