Home » Public Forums » GMCnet » Spin on fuel filter, how to plumb it?
| Spin on fuel filter, how to plumb it? [message #277686] |
Mon, 11 May 2015 18:31  |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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Senior Member |
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I have a spin on fuel filter that I have had around for a while and finally getting the time to install it. Lost the directions for how to plumb it and there is not a "IN" or "OUT stamped on the body, so my question is, does the fuel travel from the outside of the filter element to the center and then out or does fuel travel from the inside of the filter through the element to the outside and then out?
TIA
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: Spin on fuel filter, how to plumb it? [message #277690 is a reply to message #277686] |
Mon, 11 May 2015 18:41  |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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Larry, the clear ones I use inline fills the outside so I can see the stuff and passes clean gas out the center of the filter.
Larry wrote on Mon, 11 May 2015 19:31I have a spin on fuel filter that I have had around for a while and finally getting the time to install it. Lost the directions for how to plumb it and there is not a "IN" or "OUT stamped on the body, so my question is, does the fuel travel from the outside of the filter element to the center and then out or does fuel travel from the inside of the filter through the element to the outside and then out?
TIA
C. Boyd
76 Crestmont
East Tennessee
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| Re: Spin on fuel filter, how to plumb it? [message #277693 is a reply to message #277690] |
Mon, 11 May 2015 19:08 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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Senior Member |
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C Boyd wrote on Mon, 11 May 2015 18:41Larry, the clear ones I use inline fills the outside so I can see the stuff and passes clean gas out the center of the filter.
Larry wrote on Mon, 11 May 2015 19:31I have a spin on fuel filter that I have had around for a while and finally getting the time to install it. Lost the directions for how to plumb it and there is not a "IN" or "OUT stamped on the body, so my question is, does the fuel travel from the outside of the filter element to the center and then out or does fuel travel from the inside of the filter through the element to the outside and then out?
TIA
Makes sense to me, but just not sure. It's why I ask.
Larry
78 Royale w/500 Caddy
Menomonie, WI.
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| Re: Spin on fuel filter, how to plumb it? [message #277712 is a reply to message #277686] |
Mon, 11 May 2015 23:46 |
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John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
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Senior Member |
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Larry:
fuel filters that have pleated filtering media flow from the outside to the inside. The pressure of the flowing fluid wants to push the pleats in the direction of the flow. (especially as the media starts to restrict as it fills) The perforated center tube holds the pleating in place. The "IN" port goes to the ouside of the filter and the "OUT"port comes from the center of the filter (to the carb)
Best regards
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
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| Re: Spin on fuel filter, how to plumb it? [message #277722 is a reply to message #277686] |
Tue, 12 May 2015 09:23 |
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John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
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Senior Member |
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Rob:
Re. Quote: Then there's the Q-Jet filter which is the opposite! ;-0
Believe it or not: the QJet filter is backward because it will push off of the gasket seat and bypass if the filter plugs. The spring that holds it down is slightly less pressure than pump pressure. If the filter is clean, both sides of the filter are equal pressure and the filter operates properly. If the filter is clogged, if will leak past the filter seal. The engine still gets fuel, albeit unfiltered And the engine probably will run like a toilet. (But limp home)
As you have said, most filters are designed opposite in order to improve the seal during clogged conditions, because the fluid flow will enhance the seal.
That is why it is important that that filter be changed regularly.
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
[Updated on: Tue, 12 May 2015 09:25] Report message to a moderator |
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| Re: [GMCnet] Spin on fuel filter, how to plumb it? [message #277747 is a reply to message #277722] |
Wed, 13 May 2015 00:27 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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John,
Aha! So there was method to Rochester's madness!
http://www.gmcmhphotos.com/photos/aa-miscellaneous-photos/p40004-q-jet-filter-exploded-view.html
However, the bypass function of the filter could explain how the piece of crap got under the float needle valve in KenB's GMC. The
piece of crap prevented the float needle valve from seating which in turn allowed the fuel pump to pump gas out the Q-Jet's vents
and onto a hot manifold resulting in an engine fire. Things that make you go hmmmmmmmmmmmmmmmmmmmmmmm?
I have long been a proponent of Ken Frey's practice of installing a fuel filter with a metal housing in the rubber line that
connects the 3/8 inch OD metal line that is welded to the top of the front crossmember and the mechanical fuel pump inlet.
http://www.gmcmhphotos.com/photos/aa-miscellaneous-photos/p54750-fuel-pump-inlet-filter.html
IIRC Ken installed that filter in 2008. As part of my maintenance practice I would remove it at the end of each tour season, blow
through it. It was easy to blow through in 2014 when I decided to change it basically for the hell of it!
As far as I'm concerned that filter negates the necessity to replace the Q-Jet filter regularly (which is a PITA).
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: John Heslinga
Rob:
Re. Quote:
> Then there's the Q-Jet filter which is the opposite! ;-0
Believe it or not: the QJet filter is backward because it will push off of the gasket seat and bypass if the filter plugs. The
spring that holds it down is slightly less pressure than pump pressure. If the filter is clean, both sides of the filter are equal
pressure and the filter operates properly. If the filter is clogged, if will leak past the filter seal. The engine still gets fuel,
albeit unfiltered And the engine probably will run like a toilet. (But limp home)
As you have said, most filters are designed opposite in order to improve the seal during clogged conditions, because the fluid flow
will enhance the seal.
That is why it is important that that folter be changed regularly.
John
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] Spin on fuel filter, how to plumb it? [message #277749 is a reply to message #277747] |
Wed, 13 May 2015 06:09 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Rob, I disagree with your statement that if an in-line filter is installed you do not need the carb filter. I moved a coach from California back this way to Ohio. Every day of the trip I was replacing either the line filter just before the fuel pump or the carb filter. I went through 3 in-line Wix filters and 3 carb filters on that 2000 mile trip. The real problem was rust coming out of the gas tanks. Not all of the rust got filtered by the in line filter and the carb filter caught most of what was missed by the in-line filter.
My daughter and I got good at changing the filters. I would say it took less than 5 minutes to change either one.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Spin on fuel filter, how to plumb it? [message #277751 is a reply to message #277747] |
Wed, 13 May 2015 07:01 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Just a comment on fuel lines and filters from Bean Station:
A member arrived with a poorly running engine and was, litterally,
hand-pushed from where he stopped to where he was parked for the rally (his
usualy spot, as it happened). He asked for my help to replace his ignition
module.
After discussing his recent symptoms, I suggested we check his fuel
filter(s). He had, at some time during his 10+ years of ownership,
bypassed a rear-mounted electric pump, leaving in place an inline filter.
The line suspending that fillter almost below the frame was hard. When he
removed the filter and handed it to me, it was obvious that he had not cut
the down-stream attached hose; rather, it had broken off about 2-1/2 inches
beyond the filter. It was old, hard, 30R6 -- NOT ethanol-tolerant.
After pulling that piece of hose off the filter and taking him to get new
30R7 or 30R14 barrier hose (numbers which meant NOTHING to the otherwise
very helpful and apparently well experienced NAPA counterman -- they just
call it "barrier hose" and "fuel injection" or "not"), I assigned him to
run a direct line to the fuel pump for a test.
While he was running the test hose all the way from the new filter location
to the front crossmember (as an initial test), I tied to blow through that
short section of broken-off hose. Without success. I finally forced a #2
phillips screwdrive through it, dislodging a 3/4"+ glob of tar-like
deteriorated fuel hose -- or something -- leaving the hose lined with
similar stuff.
Since the owner did not want to let us help him R&R the tanks there (as he
SHOULD have done), he left the effective bypass hose in place for his
several hundred miles home. I was worried about him and called to catch
him broken down half way home with another, unrelated, minor problem. He
called the next day to say he'd gotten home with no further trouble. He's
promised to not get on the road again without rebuilding his fuel system.
DON"T neglect those old fuel system components!
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, etc., etc.
www.gmcwipersetc.com
On Wed, May 13, 2015 at 1:27 AM, Robert Mueller
wrote:
> John,
>
> Aha! So there was method to Rochester's madness!
>
>
> http://www.gmcmhphotos.com/photos/aa-miscellaneous-photos/p40004-q-jet-filter-exploded-view.html
>
> However, the bypass function of the filter could explain how the piece of
> crap got under the float needle valve in KenB's GMC. The
> piece of crap prevented the float needle valve from seating which in turn
> allowed the fuel pump to pump gas out the Q-Jet's vents
> and onto a hot manifold resulting in an engine fire. Things that make you
> go hmmmmmmmmmmmmmmmmmmmmmmm?
>
> I have long been a proponent of Ken Frey's practice of installing a fuel
> filter with a metal housing in the rubber line that
> connects the 3/8 inch OD metal line that is welded to the top of the front
> crossmember and the mechanical fuel pump inlet.
>
>
> http://www.gmcmhphotos.com/photos/aa-miscellaneous-photos/p54750-fuel-pump-inlet-filter.html
>
> IIRC Ken installed that filter in 2008. As part of my maintenance practice
> I would remove it at the end of each tour season, blow
> through it. It was easy to blow through in 2014 when I decided to change
> it basically for the hell of it!
>
> As far as I'm concerned that filter negates the necessity to replace the
> Q-Jet filter regularly (which is a PITA).
>
> Regards,
> Rob M.
> The Pedantic Mechanic
> Sydney, Australia
> AUS '75 Avion - The Blue Streak TZE365V100428
> USA '75 Avion - Double Trouble TZE365V100426
>
>
> -----Original Message-----
> From: John Heslinga
>
> Rob:
>
> Re. Quote:
>> Then there's the Q-Jet filter which is the opposite! ;-0
>
> Believe it or not: the QJet filter is backward because it will push off
> of the gasket seat and bypass if the filter plugs. The
> spring that holds it down is slightly less pressure than pump pressure.
> If the filter is clean, both sides of the filter are equal
> pressure and the filter operates properly. If the filter is clogged, if
> will leak past the filter seal. The engine still gets fuel,
> albeit unfiltered And the engine probably will run like a toilet. (But
> limp home)
>
> As you have said, most filters are designed opposite in order to improve
> the seal during clogged conditions, because the fluid flow
> will enhance the seal.
>
> That is why it is important that that folter be changed regularly.
>
> John
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Spin on fuel filter, how to plumb it? [message #277758 is a reply to message #277751] |
Wed, 13 May 2015 08:30 |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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Great report
We all need these reports
Erf
On Wednesday, May 13, 2015, Ken Henderson wrote:
> Just a comment on fuel lines and filters from Bean Station:
>
> A member arrived with a poorly running engine and was, litterally,
> hand-pushed from where he stopped to where he was parked for the rally (his
> usualy spot, as it happened). He asked for my help to replace his ignition
> module.
>
> After discussing his recent symptoms, I suggested we check his fuel
> filter(s). He had, at some time during his 10+ years of ownership,
> bypassed a rear-mounted electric pump, leaving in place an inline filter.
> The line suspending that fillter almost below the frame was hard. When he
> removed the filter and handed it to me, it was obvious that he had not cut
> the down-stream attached hose; rather, it had broken off about 2-1/2 inches
> beyond the filter. It was old, hard, 30R6 -- NOT ethanol-tolerant.
>
> After pulling that piece of hose off the filter and taking him to get new
> 30R7 or 30R14 barrier hose (numbers which meant NOTHING to the otherwise
> very helpful and apparently well experienced NAPA counterman -- they just
> call it "barrier hose" and "fuel injection" or "not"), I assigned him to
> run a direct line to the fuel pump for a test.
>
> While he was running the test hose all the way from the new filter location
> to the front crossmember (as an initial test), I tied to blow through that
> short section of broken-off hose. Without success. I finally forced a #2
> phillips screwdrive through it, dislodging a 3/4"+ glob of tar-like
> deteriorated fuel hose -- or something -- leaving the hose lined with
> similar stuff.
>
> Since the owner did not want to let us help him R&R the tanks there (as he
> SHOULD have done), he left the effective bypass hose in place for his
> several hundred miles home. I was worried about him and called to catch
> him broken down half way home with another, unrelated, minor problem. He
> called the next day to say he'd gotten home with no further trouble. He's
> promised to not get on the road again without rebuilding his fuel system.
>
> DON"T neglect those old fuel system components!
>
> Ken H.
> Americus, GA
> '76 X-Birchaven w/Cad500/Howell EFI & EBL,
> Manny Brakes & 1-Ton, etc., etc.
> www.gmcwipersetc.com
>
> On Wed, May 13, 2015 at 1:27 AM, Robert Mueller >
> wrote:
>
>> John,
>>
>> Aha! So there was method to Rochester's madness!
>>
>>
>>
> http://www.gmcmhphotos.com/photos/aa-miscellaneous-photos/p40004-q-jet-filter-exploded-view.html
>>
>> However, the bypass function of the filter could explain how the piece of
>> crap got under the float needle valve in KenB's GMC. The
>> piece of crap prevented the float needle valve from seating which in turn
>> allowed the fuel pump to pump gas out the Q-Jet's vents
>> and onto a hot manifold resulting in an engine fire. Things that make you
>> go hmmmmmmmmmmmmmmmmmmmmmmm?
>>
>> I have long been a proponent of Ken Frey's practice of installing a fuel
>> filter with a metal housing in the rubber line that
>> connects the 3/8 inch OD metal line that is welded to the top of the
> front
>> crossmember and the mechanical fuel pump inlet.
>>
>>
>>
> http://www.gmcmhphotos.com/photos/aa-miscellaneous-photos/p54750-fuel-pump-inlet-filter.html
>>
>> IIRC Ken installed that filter in 2008. As part of my maintenance
> practice
>> I would remove it at the end of each tour season, blow
>> through it. It was easy to blow through in 2014 when I decided to change
>> it basically for the hell of it!
>>
>> As far as I'm concerned that filter negates the necessity to replace the
>> Q-Jet filter regularly (which is a PITA).
>>
>> Regards,
>> Rob M.
>> The Pedantic Mechanic
>> Sydney, Australia
>> AUS '75 Avion - The Blue Streak TZE365V100428
>> USA '75 Avion - Double Trouble TZE365V100426
>>
>>
>> -----Original Message-----
>> From: John Heslinga
>>
>> Rob:
>>
>> Re. Quote:
>>> Then there's the Q-Jet filter which is the opposite! ;-0
>>
>> Believe it or not: the QJet filter is backward because it will push off
>> of the gasket seat and bypass if the filter plugs. The
>> spring that holds it down is slightly less pressure than pump pressure.
>> If the filter is clean, both sides of the filter are equal
>> pressure and the filter operates properly. If the filter is clogged, if
>> will leak past the filter seal. The engine still gets fuel,
>> albeit unfiltered And the engine probably will run like a toilet. (But
>> limp home)
>>
>> As you have said, most filters are designed opposite in order to improve
>> the seal during clogged conditions, because the fluid flow
>> will enhance the seal.
>>
>> That is why it is important that that folter be changed regularly.
>>
>> John
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: [GMCnet] Spin on fuel filter, how to plumb it? [message #277903 is a reply to message #277749] |
Fri, 15 May 2015 22:42 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Ken,
I agree with what you have noted below, I SHOULD have noted that along with installing the filter Ken Frey dropped and cleaned the
fuel tanks.
I should have qualified that statement by noting that if you have clean fuel tanks and new fuel ethanol compatible lines you could
"get away" without having a carb fuel filter.
Regards,
Rob M.
-----Original Message-----
From: Ken Burton
Rob, I disagree with your statement that if an in-line filter is installed you do not need the carb filter. I moved a coach from
California back this way to Ohio. Every day of the trip I was replacing either the line filter just before the fuel pump or the
carb filter. I went through 3 in-line Wix filters and 3 carb filters on that 2000 mile trip. The real problem was rust coming out
of the gas tanks. Not all of the rust got filtered by the in line filter and the carb filter caught most of what was missed by the
in-line filter.
My daughter and I got good at changing the filters. I would say it took less than 5 minutes to change either one.
--
Ken
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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