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Posted by: jperret Nov 13 2006, 12:03 PM

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

Posted by: ClayPerrine Nov 13 2006, 12:05 PM

About a foot into the tunnel, the metal line is bonded to the plastic.

Posted by: Dave_Darling Nov 13 2006, 04:32 PM

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

Posted by: SLITS Nov 13 2006, 04:53 PM

Yeh, and then you run into a '70 chassis that was plastic all the way through.....................

Posted by: jperret Nov 13 2006, 06:45 PM

Thanks Dave this is Great!

Joe

Posted by: rdauenhauer Nov 14 2006, 12:11 AM

Im not sure "bonded is the correct term, but I have a 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?

Posted by: eg914 Nov 14 2006, 12:32 AM

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?

Posted by: Jeff Bowlsby Nov 14 2006, 01:33 AM

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.

Posted by: SLITS Nov 14 2006, 07:43 AM

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.

Posted by: jperret Nov 15 2006, 05:34 PM

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.