in all probablity the injector lines have cracked at the junction. Common on the 602/603 engines which have (relative to the 617 motors) flimsy fuel lines.
This is probably a result of bad motor mounts

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1982 300SD (214 k, excellent shape) kidmobile running mostly biodiesel, gets 31 mpg hwy with 2.82 rear from a euro 500SEL



1976 115 body 240D 4-speed (traded for Jeep parts) - Engine lives on in my CJ7