Why do IDI Diesels have fuel return lines? Why doesn't the residual fuel wait in the feed line like in a K-Jet system?

Sixto
95 S420
87 300SDL

My guess is that since the IP is constantly pumping it needs to have the excess fuel returned to the tank otherwise something would probably blow.
Just a wild educated guess on my part.

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DJ


84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012

IIRC
.The injector bleed lines (return lines) are required to assist in the closing of the injector nozzles, to stop injector dribble.
It also assists in the bleeding of air from the injectors.
The injector pump also requires to have any air removed, as an accumulation will give problems. Some people also talk about the high flow return, from some IP makes, being used as a coolant for the IP.

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Tony from West Oz.
Fatmobile 3 84 300D 295kkm Silver grey/Blue int. 2 tank WVO - Recipient of TurboDesel engine.
Josephine '82 300D 390kkm White/Palamino int.
Elizabeth '81 280E, sporting a '79 300D engine.
Lucille '87 W124 300D non-turbo 6 cylinder OM603, Pearl Grey with light grey interior


Various parts cars including 280E, 230C & 300D in various states of disassembly.

I've been told that the fuel flow past the injectors and back thru the overflow lines lubricates the injectors.

P E H