Since I recently had to change out my '98 E320 Fuel Filter, I thought I would share it (photographically) so you can see it's not a difficult job, even for a novice mechanic like myself. I claim no expertise, and am just following the WIS procedure.
According to my EPC (I took excerpts for you, comparing my E320 to the E420).
It actually looks much easier, as your fuel pump is back at the fuel tank, and there is only ONE fuel line going IN, and only ONE going out.
Just jack her up, pull off 3 bolts, and you'll have your answer!
Sorry my photo editer won't do GIF files, otherwise I would point things out for you.
Let me know if it's not clear, and I'll be happy to assist.
1. WIS (Werk Informacion System) is the "Electronic Manual" for DB. They literally have the shop manuals for every model from 1960 something, all the way until now, including Maybach, Dumptrucks, buses, etc. Its what Mercedes techs use. They are readily available on Ebay. Instead of having the '07 models, the Ebay discs are great, and don't cost the $1,000 the dealer wants. They run around $25 USD. They are huge, 8 GIGS. Also available on Ebay is EPC (electronic parts catalogue), just like the excerpts shown above. Again, they have every part, for every car, every year you can imagine, again, 6 GIGS, and also run about $25.
2. The photo you can't read (sorry!!!) fuel line clamps are placed on the FRONT two lines which are the "IN" lines (one from gas tank, one from fuel pump). The
"EXIT" lines are not under any pressure, so +/- if you want to clamp them.
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