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Old 04-12-2014, 11:16 PM
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Join Date: Aug 2012
Location: north new jersey
Posts: 7
1998 300d: does black viton hose replace the clear plastic hoses when upgrading fuel

I am changing the fuel line hoses on a 1998 e300 to viton hoses. I'd like to keep clear lines to see air bubbles and fuel flow as it is now. Is this possible with viton hose? do i need to use Viton for the clear hoses? I am running b99 when i can. Also, does anyone have a spec on the sizing of the hoses and or a diagram of the fuel line?

Last edited by tashijoe; 04-13-2014 at 09:19 PM. Reason: get more hits
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Old 04-13-2014, 10:22 PM
fashion victim immunizer
Join Date: Feb 2012
Location: oakland
Posts: 930
there are various clear lines that will work at least partially with b100. that is, they may hold up for a few years, but not as long as viton would. not knowing anything about a 98 e300 i dont know how hard it is to change lines and if you would want to do that every few years. i have clear tygon lines on my 81 in places and its held up for over a year now. i do believe nylon is biodiesel rated, so if you can find clear nylon in your size that might be the way to go.
1981 NA 300D 310k miles
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Old 04-14-2014, 02:42 AM
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Join Date: Sep 2003
Location: Ft Lauderdale FL
Posts: 204
Clear Lines

The Clear Lines are actually good. The fittings on 98 and 99 are a weak point even on diesel fuel. They contain O rings in them that seal plastic tips to the pumps and filter. This is a weak point but I do not have a size for those to replace with. I could measure the left over one I have in my tool box but there are multiple sizes just like on an older Mercedes so that they can only go in one place. I considered cleaning them real well and JB welding them in place but that is a really bad idea after thinking about it.

You should see how much better the design on my 05 CDI is with the common rail, it is sharp. Except that the rubber hose to the fuel filter has to be removed to change the fuel filter. After the first filter I just change the rubber hose every time I remove it. Or at least that one time, needs it again this summer. That is every two or three years. I could buy a better version but I do not think it would hose clamp on as good. It is just one of those compromises we all have to do.

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