Inline fuel filter????? - Mercedes-Benz Forum
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#1 (permalink) Old 02-24-2010, 09:50 PM
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Inline fuel filter?????

1979 W123 300D. Looking to do a diesel purge and change all the filters. I have looked everywhere and do not see a inline fuel filter. The spin on type filter is right there in plain site...so is there not a inline on these cars? Or did the previous owner remove and/or not replace?...Thanks
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#2 (permalink) Old 02-24-2010, 09:55 PM
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Look down by the injection pump. In the proximity of the motor mount.

When was the last time the fuel strainer was replaced?

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#3 (permalink) Old 02-24-2010, 09:56 PM
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There should be one before the lift pump.

Old photo, but it's beside the old style (white cover) primer pump

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#4 (permalink) Old 02-25-2010, 08:23 AM
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I should be between the lower metal fuel line and before the primer pump.

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#5 (permalink) Old 02-25-2010, 07:49 PM
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Originally Posted by MBeige View Post
There should be one before the lift pump.

Old photo, but it's beside the old style (white cover) primer pump
Take a look at this pic. I believe there is no filter there, black hose from metal line next to white cap???? Thanks for the time...

I have not had this car a week. Don't know about the fuel strainer...Any other maintenance items you can send me would be great. Thanks
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#6 (permalink) Old 02-25-2010, 08:11 PM
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in case those guys are off-line, i'll answer... you're belief is correct; the filter is not there. The line you mention should be in two pieces, and the filter should be in the middle, the 90 degree part pointing toward the white cap you mention. That white cap is the old style plunger on the lift pump. This is what gets the fuel to your injection pump. The white thing unscrews (ccw), then pumps up and down to prime the filters, etc. The new, cheap bosch model ($13 from autohausaz.com) just screws on and is a very easy/gratifying fix.
You can pull the fuel line off of the right side of the lift pump, stick an inline filter on it, then find a couple of inches of the same fule line to connect the 90 degree side to the lift pump. Cheap and easy, and you will have corrected a serious wrong (unless the p.o. put the filter somewhere else). Don't forget to round up a couple of hose clamps too.

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#7 (permalink) Old 02-25-2010, 10:15 PM
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Originally Posted by mdanielson View Post
in case those guys are off-line, i'll answer... you're belief is correct; the filter is not there. The line you mention should be in two pieces, and the filter should be in the middle, the 90 degree part pointing toward the white cap you mention. That white cap is the old style plunger on the lift pump. This is what gets the fuel to your injection pump. The white thing unscrews (ccw), then pumps up and down to prime the filters, etc. The new, cheap bosch model ($13 from autohausaz.com) just screws on and is a very easy/gratifying fix.
You can pull the fuel line off of the right side of the lift pump, stick an inline filter on it, then find a couple of inches of the same fule line to connect the 90 degree side to the lift pump. Cheap and easy, and you will have corrected a serious wrong (unless the p.o. put the filter somewhere else). Don't forget to round up a couple of hose clamps too.
Huge Help! Thanks!
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#8 (permalink) Old 02-26-2010, 09:02 AM
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Here's mine. Boy, does it need changing!
I have the new style primer pump, the + sign in red, replaces the white knob one.
You can tell I have plenty of line there, 5/16. This way I can lift it up to swap it out without spilling any fuel.
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#9 (permalink) Old 02-26-2010, 12:55 PM
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Heh, I bet the PO must have ran into issues with the inline clogging up constantly, as that is probably the only reason someone would make such a drastic change. I'm guessing dirty veggie oil...
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#10 (permalink) Old 02-26-2010, 09:35 PM
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Heh, I bet the PO must have ran into issues with the inline clogging up constantly, as that is probably the only reason someone would make such a drastic change. I'm guessing dirty veggie oil...
Thanks to all for the intel. I ordered a inline along with that new style primer pump. Its gonna take me a bit to get her right...
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