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fuel line question...what material can I use?
#45046 Thu Jul 11 2002 09:10 AM
Joined: Jul 2001
Posts: 140
G
gmcfan Offline OP
Shop Shark
Do I have to use steel tubing for the fuel pump to carb connection? Can I use copper? The only reason Im asking is, I have some copper tubing that is the perfect size. I appreciate your response. Thanks!

Re: fuel line question...what material can I use?
#45047 Thu Jul 11 2002 11:14 AM
Joined: Apr 2000
Posts: 58
J
Member
That would be fine. If you want to get fancy chrome water supply line works great also.

Re: fuel line question...what material can I use?
#45048 Thu Jul 11 2002 12:16 PM
Joined: Apr 2000
Posts: 81
6
Wrench Fetcher
I once used a copper line to make a "cold can" to try and relieve my vapor lock problems on a truck I used to have. When I told my mechanic friend about it, he told me that the gasoline would eventualy eat through the copper. eek Anyone else know if that is true?


If at first you don't succeed, get a bigger hammer.


1941 Pontiac business coupe
1947 Chev Coupe
1969 GTO ragtop
Re: fuel line question...what material can I use?
#45049 Thu Jul 11 2002 06:19 PM
Joined: Jan 2001
Posts: 667
C
Shop Shark
From
http://www.faqs.org/faqs/autos/gasoline-faq/part1/

"Gasolines are usually defined by government regulation, where properties and
test methods are clearly defined. In the US, several government and state
bodies can specify gasoline properties, and they may choose to use or modify
consensus minimum quality standards, such as American Society for Testing
Materials (ASTM). The US gasoline specifications and test methods are listed
in several readily available publications, including the Society of
Automotive Engineers (SAE) [38], and the Annual Book of ASTM Standards [39].

The 1995 ASTM edition includes:-
D4814-94d Specification for Automotive Spark-Ignition Engine Fuel.
This specification lists various properties that all fuels have to comply
with, and may be updated throughout the year. Typical properties are:

...4.10.5 Copper strip corrosion
Ability to tarnish clean copper, indicating the presence of any corrosive
sulfur compounds

4.10.6 Maximum Sulfur content
Sulfur adversely affects exhaust catalysts and fuel hydrocarbon lead response,
and also may be emitted as polluting sulfur oxides.
Leaded = 0.15 %mass maximum, and Unleaded = 0.10 %mass maximum.
Typical US gasoline levels are 0.03 %mass. "

So today's gasoline should not affect the copper line.

Re: fuel line question...what material can I use?
#45050 Thu Jul 11 2002 06:22 PM
Joined: Oct 2001
Posts: 3,459
Extreme Gabster
Copper is subject to metal fatigue, though. That's the main reason steel is used. Copper lines of any significant length will crack over time.


Paint & Body Shop moderator
A lone amateur built the Ark. A large group of professionals built the Titanic.
Re: fuel line question...what material can I use?
#45051 Fri Jul 12 2002 08:41 AM
Joined: Feb 2001
Posts: 1,904
M
Member
You can use brake lines they come in several diameters and it is mor forgiving than the hard steel.
Just make sure you have a flexible fuel hose from where the hard line leaves the frame to where it hooks to the fuel-pump.It needs to be flexible so it does not break when the engine torques/twists.


There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!
Re: fuel line question...what material can I use?
#45052 Fri Jul 12 2002 08:53 AM
Joined: Feb 2001
Posts: 1,133
D
Shop Shark
I'm sure that some one will tell me GMC did it different to Chev , but on my truck , the original steel lines are still in place , with no flex line anywhere.
Copper work hardens real quick . I used Copper on the bypass oil filter lines and the drain line broke after 2 yrs of daily driving .

Re: fuel line question...what material can I use?
#45053 Fri Jul 12 2002 10:03 AM
Joined: Jun 2001
Posts: 85
B
Wrench Fetcher
I've had the same copper 3/8th fuel line from my fuel pump output to the 390 Holley inlet, for better than 25 years on my 292. Still no problem. [It's connected w/ 3/8 rubber fuel hose 3" from fuel pump and goes into more rubber fuel hose and a G15 gas filter before the carb. -- that probably negates vibrations]
I'll let you know when it fails me.
In fact, the rubber hoses and fuel filter I just replaced today (about every 2 years or 10,000 miles.)


Every 25 years I like to rebuild that 292 just for GP

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