One of my hard metal fuel lines developed a leak where the metal hex nut screwed the fuel line to the top of the delivery valve on the IP. The factory new replacement part had been reinforced exactly where my hard fuel line had cracked, so it must have been discovered as a high failure point. I got the replacement here at partshop for less than 1/2 what other dealers I tried wanted.

The rubber o rings on the delivery valves are also likely to be leaking. On my 603, they leaked like a sieve, but were dry after replacing. If you want to go that route, you will need a special splined socket.

But, I would start with the fuel return lines first (I bet it doesn't entirely fix the problem).

alec

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84 300TD - 235k - Farbe "Surfblau" bought at 213k
87 300SDL - 131k - Farbe "PimpGold" bought at 115k
00 Klepper Faltboot Expedition Double