Home » Public Forums » GMCnet » Metal fuel line info (Need proceedure)
| Metal fuel line info [message #271625] |
Tue, 10 February 2015 12:03  |
Jim Rountree
Messages: 47
Registered: July 2010
Location: San Antonio, TX
Karma: 0
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EMERY STORA
I need help in finding your procedure on this for the fuel tank.
Thanks
Jim Rountree
San Antonio,TX
76 PB,
76 Royale RB
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| Re: Metal fuel line info [message #271679 is a reply to message #271625] |
Wed, 11 February 2015 07:43  |
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SeanKidd
Messages: 747
Registered: June 2012
Location: Northern Neck Virginia
Karma: 4
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http://www.gmcmhphotos.com/photos/g6560-fuel-tank-hard-line-project.html
The hard lines were difficult to install, I prefabricated the tank feeder lines, twice, once the tank is in, there is very little room next to the frame to tighten a flared coupling, and it needs to be tight to the floor.The space between the frame and floor was barely sufficient to accommodate the fuel line, when you add the vent and the fill line, it gets too tight, I had to use a piece of ethanol resistant line to couple my vent hard lines. (I also ran independent vents up to the fill/overflow). Furthermore the vapor line was a challenge, again, the space between the frame and the bogie along with air lines and brake lines required some tight radius bends. All together I used 3 or 4. Six inch rubber splices to make it all work. Despite the lower cost per foot of the Cunifer, the fittings turned out to be the most expensive. As exNavy aircraft mechanic and habitual tinkerer, coupled with a long winter to plan (read: over engineer) got the best of me, my fuel system may be close to bulletproof, but no one is shooting at it.
Last note: even though the carter pumps put out 6 psi, I still need to knock it down, I used an adjustable Holley bypass regulator set at 3.5 psi.
Sean and Stephanie
73 Ex-CanyonLands 26' #317 "Oliver"
Hubler 1-Ton, Quad-Bags, Rear Disc, Reaction Arms, P.Huber TBs, 3.70:1 LSD Honda 6500 inverter gen.
Colonial Travelers
[Updated on: Wed, 11 February 2015 07:44] Report message to a moderator |
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| Re: [GMCnet] Metal fuel line info [message #271801 is a reply to message #271800] |
Thu, 12 February 2015 10:38 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Yep ya gotta use the special hose that is made for submersion in gasoline. I got mine from NAPA. And yes they are very proud of it. Also the pickup tube does not have a bubble flair on it. Worm hose clamps will not hold. The spring type Corbin clamps do hold, so far. Also the tank access ports in the floor make this annoying rather than a SOB PITA.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] Metal fuel line info [message #271863 is a reply to message #271809] |
Fri, 13 February 2015 02:21 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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I had a similar problem with a pickup hose inside my diesel tank on my John Deere. I stopped by the JD dealer and he had the hose rated for gasoline submersion. Both inside and outside were rated for fuel immersion. He cut me off the pieces I needed and gave it to me. He said the stuff was very expensive. He also had some nylon stiff stuff that they use in modern cars but you have to heat it like shrink tubing to get it to seal. Again if you use clamps, use the type that are a loop and you squeeze the with a pair of pliers (available at Sears) to open them up. Those type of clamps are available at Ace Hardware. I already had the pliers.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Metal fuel line info [message #271969 is a reply to message #271932] |
Sat, 14 February 2015 10:47 |
Dave Mumert
Messages: 272
Registered: February 2004
Location: Olds, AB, Canada
Karma: 0
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Those little spring clamps are sometimes called constant tension clamps.
If you Google " constant tension clamps" you will find lots of them.
There are also larger constant tension hose clamps for coolant sized hoses, they look like a worm drive clamp but have some sort of
spring in them.
Dave Mumert
'76 Eleganza II
Alberta, CA
> -----Original Message-----
> Subject: Re: [GMCnet] Metal fuel line info
>
> Ken Burton wrote on Fri, 13 February 2015 03:21
>> Again if you use clamps, use the type that are a loop and you squeeze
>> the with a pair of pliers (available at Sears) to open them up. Those type of clamps are available at Ace Hardware. I already
had the
> pliers.
>
>
> What is the proper name of these squeeze clamps, please?
>
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| Re: [GMCnet] Metal fuel line info [message #272176 is a reply to message #272168] |
Tue, 17 February 2015 12:58 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Don,
My experience has been that the screw type "aviation" clamps can loosen
over time, especially with temperature extremes. The spring clamps, on the
other hand, while not as satisfying to install to "my" specifications, do
not seem to ever loosen. Maybe the manufacturers who seem to use only the
spring clamps DO know something I don't. :-)
But I can't cite any more specific information than that.
Ken H.
On Tue, Feb 17, 2015 at 11:28 AM, Don Jeffers
wrote:
> Many, many thanks to all who contributed to this thread. It is providing
> a lot of very good information for our high-pressure in-tank submerged pump
>
> three-tank fuel system we are building.
>
> The dead-head pressure of our pumps is 80 psi and we want very good clamps
> and in-tank hose that won't go soft and fail. The system is common rail
> delivery. All pressure and return lines are double-flared steel.
>
> The fuel pumps are made for big block 454 Chevy/GMC EFI service. We
> regulate the pressue to about 45 psi at our engine with the return fuel line
> selected to the pump/tank in service.
>
> The Spectra brand sending unit/pump assemblies we are modifying utilize
> "Ear type constant tension clamps" to connect the pumps to the output tube;
> fine and quick for assembly line manufacturing but I think might leave
> something to be desired for side-of-the-road repairs, changing out pumps. We
> are installing deck plates over the sending units for access.
>
> Anyone have any idea what the relative clamping force of these small Ear
> clamps is vs. the other types? I will probably try to call up the clamp
> manufacturers. Airtex has been very good to provide performance and
> dimensional specifications for their fuel pumps.
>
> I will continue to look for a worm type or spring type clamp (flat or
> spring?) constant tension clamp to use in this high pressure service. Maybe
> we
> should just use Ear clamps as the manufacturer Spectra has and carry the
> tools and clamps on board.
>
> The in-tank submerged hose has a pre-compression outside diameter of ~
> 0.550 inchs; one end onto a 3/8" o.d. steel tube and the other end onto the
> 5/16" o.d. plastic pump outlet.
>
> If anyone has any comments for what you think would be a good clamp for
> this application, we would appreciate hearing what you have to say.
>
> Again, thanks to all.
>
> Don and Susan Jeffers
> 78 Eleganza II 500 Cad EFI
>
>
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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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