| Fuel Line Question [message #131092] |
Mon, 20 June 2011 13:03  |
Jon payne
Messages: 495
Registered: May 2008
Karma: 1
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Senior Member |
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Hi all,
I am planning on dropping the fuel tanks later this summer. I would like to replace the fuel feed hoses with steel tubing. I have some doubts on the sizing of the hoses and tubing. I have read on GMCMOTORHOME.INFO page that the fuel feed hoses are 3/8" but does not mention if that is ID or OD. Looking at steel tubing the sizes are all in O.D.
Can someone please clarify the sizing of the rubber hoses? If different from steel tubing (ID vs OD) what is the proper steel tubing size for the fuel feed?
Thanks,
Jon
Jon Payne
76 Palm Beach
Westfield,IN
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| Re: [GMCnet] Fuel Line Question [message #131096 is a reply to message #131092] |
Mon, 20 June 2011 13:30  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Jon,
Fuel/Brake tubing is measured OD. Hose is measured ID. So the 3/8"
30R9 hose will slide right on the 3/8" steel tubes. Similarly the
5/16" vent lines.
Someone reminded me, after our earlier discussion of how to terminate
steel lines to retain hoses on tubes, of a trick I've often used but
didn't mention:
Once a compression fitting ferrule has been proper tightened on a
steel (or copper) tube, it won't come off. I use a compression
coupling with the interior stop drilled out so it will slide
completely over the target tube. After tightening the nut to compress
the ferrule at any distance I want it from the end of the tube, I can
slide the coupling body, or the nut, dependent upon orientation, off
of the other end of the tube. Of course, if the other end is already
terminated, there ain't no slidin' off, so the nut has to stay on the
tube. A small price to pay for ensuring that the hose later clamped
on the end can't slide off.
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI+ & EBL
www.gmcwipersetc.com
On Mon, Jun 20, 2011 at 2:03 PM, Jon Payne <embrep@sbcglobal.net> wrote:
...I have read on GMCMOTORHOME.INFO page that the fuel feed hoses are
3/8" but does not mention if that is ID or OD. Looking at steel
tubing the sizes are all in O.D.
>
> Can someone please clarify the sizing of the rubber hoses? If different from steel tubing (ID vs OD) what is the proper steel tubing size for the fuel feed?
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: Fuel Line Question [message #131135 is a reply to message #131092] |
Mon, 20 June 2011 18:46 |
GeorgeRud
Messages: 1380
Registered: February 2007
Location: Chicago, IL
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Is there any reason not to use aluminum tubing instead of steel? It certainly is easier to bend abd form.
George Rudawsky
Chicago, IL
75 Palm Beach
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| Re: [GMCnet] Fuel Line Question [message #131136 is a reply to message #131114] |
Mon, 20 June 2011 18:47 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Why? It wouldn't be usable anyway. Unless it's for show instead of
go, I wouldn't bother.
Ken H.
On Mon, Jun 20, 2011 at 6:02 PM, Rob Mueller > You could cut deep
slots 180 degrees apart in the nut with a Dremel cut off
> tool and then peel it apart. Just be careful not to nick the tube.
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Fuel Line Question [message #131195 is a reply to message #131136] |
Tue, 21 June 2011 00:33 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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| Ken Henderson wrote on Mon, 20 June 2011 18:47 |
Why? It wouldn't be usable anyway. Unless it's for show instead of
go, I wouldn't bother.
Ken H.
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To keep it from rattling around and eventually wearing a hole in the tubing. Alternately I would tape up the nut to keep it from bouncing around.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Fuel Line Question [message #131215 is a reply to message #131195] |
Tue, 21 June 2011 06:49 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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On an airplane, I'd definitely agree with y'all. With a brass nut on
a steel tube, on a GMC, I don't think the GMC will last that long.
But you're right to be cautious.
Ken H.
On Tue, Jun 21, 2011 at 1:33 AM, Ken Burton wrote:
>
>
> Ken Henderson wrote on Mon, 20 June 2011 18:47
>> Why? It wouldn't be usable anyway. Unless it's for show instead of
>> go, I wouldn't bother.
>>
>> Ken H.
>
> To keep it from rattling around and eventually wearing a hole in the tubing. Alternately I would tape up the nut to keep it from bouncing around.
> --
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: Fuel Line Question [message #131303 is a reply to message #131092] |
Tue, 21 June 2011 13:26 |
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You could use a bubble flare tool to make a nodule on the end of a line that with a hose clamp will not come off. For the fuel vent lines has anyone considered some kind of plastic tubing which is resistant to fuel?
73 Canyon Lands, (a.k.a. The Yellow Submarine) West Los Angeles CA
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