after doing some work on the fuel lines I noticed that the new clear bosch pre-filter I just installed is backwards (as per the arrows on it). It runs fine, should I bother changing it again???

thanks...

also I posted in the tech section a question about running wires in my 124, if you can help with that I would be very gratefull...

But there is much more surface area on the outside of the filter than the inside. Also, you won't be able to visually inspect the contaminent level. The outside will always look clean.

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04 Sprinter 140" 2500
97 F450 7.3L
97 K2500 6.5L
76 Mercedes 300d 98k original
78 300CD 133k
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Will take you about five minutes to change, please go and do that. Then you'll have no worries.

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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Flip it around, it probably took longer to write the post then to turn it the right way.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200