 Fuel Line Questions |
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| jperret |
 Nov 13 2006, 12:03 PM
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#1
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Newbie  Group: Members Posts: 27 Joined: 15-April 06 Member No.: 5,868  |
I went back and read the past postings. They were a great help.
Took out the fule tank and see METAL fuel lines coming out. On the other end the tubes that come out by the engine seem to be plastic. Is this normal? Where does the metal end? Because I see plastic, I am inclined to replace them. What do you guys think. BTW - you all have been most helpful. Thanks |
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| ClayPerrine |
Nov 13 2006, 12:05 PM
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#2
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Life's been good to me so far..... Group: Admin Posts: 15,463 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille 
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About a foot into the tunnel, the metal line is bonded to the plastic.
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| Dave_Darling |
Nov 13 2006, 04:32 PM
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#3
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914 Idiot Group: Members Posts: 14,985 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California
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Look in the Pelican 914 Tech Articles for a link entitled "Tour of the Center Tunnel". You'll see the tunnel all laid open for your edification...
Thanks to Charlie Davis for taking the pics, and to Al Swanson (do I have the correct member of that 914 clan?) for plasma-cutting the thing out of a car for us!! --DD |
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| SLITS |
Nov 13 2006, 04:53 PM
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#4
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
Yeh, and then you run into a '70 chassis that was plastic all the way through.....................
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| jperret |
Nov 13 2006, 06:45 PM
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#5
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Newbie Group: Members Posts: 27 Joined: 15-April 06 Member No.: 5,868 |
Thanks Dave this is Great!
Joe |
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| 914werke |
Nov 14 2006, 12:11 AM
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#6
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"I got blisters on me fingers" Group: Members Posts: 10,059 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest
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QUOTE(ClayPerrine @ Nov 13 2006, 10:05 AM)  About a foot into the tunnel, the metal line is bonded to the plastic. Im not sure "bonded is the correct term, but I have a (IMG:style_emoticons/default/hijacked.gif) Q: How are the steel ends "sealed" to the plastic lines? The steel sections are barbed but it look like the plastic is swedged or heated onto the steel ends? (IMG:style_emoticons/default/confused24.gif) |
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| eg914 |
Nov 14 2006, 12:32 AM
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#7
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Member Group: Members Posts: 319 Joined: 17-June 04 From: Elk Grove, CA Member No.: 2,223 Region Association: None |
Also, why was steel used at the front end of the fuel lines? If they were replaced with new nylon lines would the steel front portion need to be used?
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| JeffBowlsby |
Nov 14 2006, 01:33 AM
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#8
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914 Wiring Harnesses Group: Members Posts: 8,505 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None
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I think it is possible to replace the plastic portion with new, to match the original identically. A pressure tester could be easily fabricated to pressure test the assembly.
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| SLITS |
Nov 14 2006, 07:43 AM
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#9
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
Look at it this way ..... cars up to '74 have the fuel pump in the rear, so the supply line only sees such pressure as can be developed by the height of fuel in the tank and that is mitigated by the suction of the pump......hence, little or no pressure on the supply line.
The return is a free discharge into the tank and esentially no pressure or very little pressure. The only consideration in this scenerio is when the fuel pump is mounted under the tank ..... then the supply line will see upwards of 30 psig. |
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| jperret |
Nov 15 2006, 05:34 PM
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#10
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Newbie Group: Members Posts: 27 Joined: 15-April 06 Member No.: 5,868 |
Good point. There is essentially no pressure on the lines. I plan to replace them anyway, and while we are at it, move the fuel pump to the front, under the gas tank.
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