All mercedes w123 diesels have them and others too....here is where it is located

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Great. Thanks. I'll plan to check both of mine.

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1979 300D 040 Black on Black - 1985 300D Maaco job (sadly sprayed over 199 Black Pearl Metallic) on Palamino

http://i.imgur.com/LslW733.jpg

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Visit the W123 page on iFixit for over 70 helpful DIY guides!

Yesterday I replaced the spring inside the Fuel Bypass Valve with this puppy:



Ace Compression spring #144
1" x 15/64" x 0.028"


It seems to work great fuel delivery-wise; but my only concern is idle fuel flow through the bypass is severely diminished, and I know the IP uses the fuel for cooling...

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72% 1992 FJ80 + 17% 1983 OM617 + 10% 85/87/92 4Runner + *Eclipse/GMC = 100% Truck
(*<1%)
Build Thread: http://forum.ih8mud.com/threads/a-humble-fj80-om617-r151f-swap.759554/

It has been discussed many times, that the spring is a certain type and sadly we have all been down the road of searching the bulk parts bin for a replacement spring. Good for an emergency but I would stick with the OEM one.

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