Hi black_adder, sorry, I'm not familiar with the KA-Jetronic, but it seem's that there is one pressure regulator too much (or maybe two...).
Anyway: What I know, is that your car needs new fuel-tubes. Cohline 3124 8x14mm - not expensive.

Good luck Martin

 

My 1983 380 maybe of some use....

 

Jensencars, thats alot. I dont see any fuel pressure vacuums on yours . Well I will give mine a go. Ill let you know once I get chance. Thanks and Happy Fathers Day.

And yes this 82 needs ALOT more than what is shown... Im taking it one step at a time.

 

Hopefully some of these might help. They're from my '83 380.

 

Not sure you will see this, too funny I just ran into this same issue. I inherited the car with the fuel distributor CIS system removed. So I have a replacement system and noticed an additional banjo upon installing- it appears that the vehicle the distributor came from had a pressure regulator near the firewall that I am guessing is for another model? seems that this would not be required on the 380SL? Am I correct in your statement, because I don't see vacuum lines either? Thanks if you do see the post again.

 

My engine doesn't look like what it did when those pictures were posted... here's what it looks like now. There is a pressure regulator in the back of the engine and it does connect via a banjo connector.

Red arrow points to the regulator.
Blue arrow points to the line with the banjo connector on the end that goes to the FD.

 

There is also a vacuum line connected to the front (to the right in the picture, but out of view) of the pressure regulator. I'll check tomorrow to verify the color and where it goes.

 

Thanks, yes I am still confused. That would be wonderful. I will be looking at car tomorrow. I will get some good pictures,maybe it will make more sense to me.

 

This may be a little difficult to picture at first... give it a minute...

This first picture shows the locations of what I'm calling Regulator 1 and Regulator 2

This next picture shows a closeup of Regulator 1.
It shows the location of the vacuum line that goes to regulator 2.

This next picture shows the vacuum line "T" connector that attaches to regulator 2. The regulator is just labeled 2 for simplicity (and lack of room).
It also shows the path of vacuum line that comes from regulator 1 but it is hidden beneath some bracketry so all you see in the photo is the direction the line enters to "T" from.
Sorry, it's the best I could do in the tight space of the photo.

This next photo shows the end of the vacuum line that comes from the "T" located on regulator 2.
This line is what connects to the air filter housing via a large rubber tube (not shown)

If you need further information or better photo's let me know.

 

Oh wow, thanks so much... I will be headed to car soon, this should really help! Thanks again

 

So here is where I am stumped... i have two banjos that lead to the FD...what gives here. One comes off that rear pressure reg the other off electronic sensor?

 

Interesting too, I just noticed line missing to connect the rear pressure reg as well?

 

I'm responding even as we speak. Give me a few minutes.

 

I am close I think

 

Sorry, but your setup doesn't look like mine. I have an '83 380sl.
I don't have two banjo connectors on my FD at that location... I only have 1.
The thing you called an electronic sensor is actually the frequency valve and on my setup the fuel line on the front of the frequency valve connects to the side fitting on the rear pressure regulator.
The banjo connector on the lower of the left side of the FD connects to the rear pressure regulator front end connector (the side opposite the vacuum line T).
I'll try to get you a picture but for some reason my PhotoShop decided not to work for the first time in at least 6 years. Grrrr!

 

I appreciate your help, I am working on a 1981 model. Maybe the reason? Trying to locate one to look at.

 

Thought I posted the latest, not seeing it. So the MYSTERY is solved, the 1981 only has one regulator! I found an entire engine complete and it is completely different than the 1983.

 

Here is the photo of 1981 engine complete.