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Old 08-07-2008, 03:56 PM
oso oso is offline
'87 300TD
Join Date: Oct 2007
Location: San Antonio, TX
Posts: 189
Fuel filter question OM603

My new spin -on fuel filter came with a baggie the had 2 o-rings in it: one smaller, one larger. Where do they go? My old filter did not have any....
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Old 08-07-2008, 06:56 PM
compress ignite's Avatar
Drone aspiring to Serfdom
Join Date: Feb 2004
Location: 32(degrees) North by 81(degrees) West
Posts: 5,554
On the bolt that fits in the top center of the filter

The only bad part is I don't know where the o-rings go in relation to the bracket
(Both on top?, Both on the bottom?,one on top and one on the bottom of the
bracket flange that the filter "Spins" onto [With the bolt coming down from above?]

Some helpful soul will jump in to correct me on the location(s).[Please]

(You're Soooo lucky,without those two o-rings the filter/flange interface
usually leaks like a Fire-Hose!)

EDIT: I just love THIS function!

Thanks K581RC,

As we can see from the depiction the illustration shows exactly where the
o-rings go on the bolt.
Attached Thumbnails
Fuel filter question OM603-screenhunter_04-aug.-07-17.52.gif  
'84 300SD sold

Last edited by compress ignite; 08-08-2008 at 12:48 AM.
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Old 08-07-2008, 07:31 PM
Registered User
Join Date: Apr 2007
Posts: 11
On my '86 SDL they go right on the bolt, in grooves to hold them precisely in place, I think one is bigger, goes further to the top. Hope that helps!
'86 300 SDL
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Old 08-08-2008, 10:40 AM
oso oso is offline
'87 300TD
Join Date: Oct 2007
Location: San Antonio, TX
Posts: 189
Thank you both! As always right on the money! Job itself takes just minutes to complete.
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Old 08-08-2008, 03:31 PM
redassag00's Avatar
I like OM603's
Join Date: Nov 2005
Location: Katy, TX
Posts: 1,232
No Orings on the bolt can cause issues....
91 350SD
15 F250 6.7L
97 FZJ80 LX450
Overseas Rides:
Santa Fe LWB 2.2L CRDi
GWM Steed 2.0 CRD
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Old 08-08-2008, 04:12 PM
oso oso is offline
'87 300TD
Join Date: Oct 2007
Location: San Antonio, TX
Posts: 189
Originally Posted by redassag00 View Post
No Orings on the bolt can cause issues....
You are correct. Since I never actually changed the spin-on filter before, and when I did I did not pull the bolt out , I did not know of the 2 orings that need to be replaced when doing the filter change.Second time around,with the help from you all, I knew what to do and this time I made sure I have fastened it tight. Car starts perfect again. Thanks for the pictorial and other tips.
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