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Racor Filtration System

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Eric Maclean Co-Admin:
Eric
Go to the coach assist library where you will find the manuals on the original racor unit.
Here is a link to a new sight glass if you need it but it's usually the "O" rings that are the problem.

https://www.dieselfiltersonline.com/300200-racor-300200-prefilter-w-o-ring-200-mic-discontinued-order-790r30-replacement-unit.html?srsltid=AfmBOorbE0TB-VaCLMX_LLCTWxMlip6hZvqzYsxNX3v-JAlHsL9pUpXn

You may find this past post helpful
https://beaveramb.org/forum/index.php/topic,10706.msg72846.html#msg72846

The "o" rings are a known problem with this system but it is a serviceable part .
I know of at least one other person who has removed the sight glass and threaded the housing to accept a J.I.C. hydraulic fittings so the fuel line could be connected directly by passing the sight glass and coarse screen.

Hope this helps
Eric

Frank Bergamo:
If you are going the O-ring replacement direction, the O-rings are different sizes. There are 4 total, two on the ends of the clear pre filter, and two inside the housing opening that holds the pre filter. Very subtle difference in size, so keep track of them when disassembling. Good luck!

Eric Maclean Co-Admin:
Frank is correct there are two different "O" ring sizes used you will need two of each although it's nice to have spares as they are fairly cheap.
They are made of Nitrile so the fuel won't effect them . You should be able to pick them up at your local hydraulic shop.
The numbers are are space standard sizes as follows.

Part # 114  dimensions. .612OD x .103 cross section
Part #208   dimensions.   .609OD x .134 cross section


Eric

Eric Drickersen:
Thank you for the links and valuable advise on the installation. I had seen the pre filter for sale at the link you provided, but seems to be out of stock and discontinued. In any case, I am hopeful it's just the seals. I also see the seal on the elbow attachment is old and deformed; I'll look for that one as well. Are there any other seals or internal components I should service before reinstalling? I totally agree it's an excellent idea to keep a couple of each as spares.
Thanks again!

Frank Bergamo:
Looks like you have the bases covered. When I replaced the O-rings on my 02’ Marquis, never had another problem with air in the fuel system. Most people will say upgrade to a newer primary fuel system, but in my case, a few O-rings fixed the problem. Cheap fix if it works, if not, then spend the money to upgrade. Your call! Good luck!

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