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Old 12-17-2006, 03:15 PM
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Join Date: Oct 2004
Location: Williamsburg, VA
Posts: 108
Fuel line - plain rubber okay?


Been chasing mediocre performance in my california-spec 1985 300TD, and have identified and corrected a leaking primer pump earlier today (replaced the old white pump with the Bosch upgrade). Previously I replaced primary and secondary fuel filters.

Following today's primer pump replacement, I noticed I was getting air bubbles into the primary filter.

Put the car up an ramps, and could immediately see fuel leaking from the supply line back at the fuel tank.

I can readily see that these "soft" lines are rubber encased in a braid. Not certain that Advance Auto or AutoZone will have lines like this, can I use plain rubber fuel line to replace the leaking lines? I would think they are braided for a reason, but perhaps not?

Anyone know right off with the appropriate ID is?

Thanks in advance,
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Old 12-17-2006, 03:24 PM
vstech's Avatar
Join Date: Mar 2006
Location: Mount Holly, NC
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5/16" lines should fit fine and work for years. make sure you use Fuel lines, not vacume or heater hose lines.
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Old 12-18-2006, 02:52 PM
toomany MBZ's Avatar
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Rubber fuel lines fine, DO NOT use bio-diesel, as is corrosive to rubber.
83 SD

84 CD
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Old 12-18-2006, 05:53 PM
Old300D's Avatar
Biodiesel Fiend
Join Date: Apr 2004
Location: Denver, CO
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Originally Posted by toomany MBZ View Post
Rubber fuel lines fine, DO NOT use bio-diesel, as is corrosive to rubber.
Or use OEM lines (or Viton) and DO use biodiesel, a superior fuel.
'83 240D with 617.952 and 2.88
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