engine bay hoses 1.8 L Jet, colors, arrangements etc Options

[wonkipop]

this topic arose in the thread concerning hose colors for D Jet cars.

i've started a new topic so it does not mess the other thread.

first thing to say is that the factory manual is more scant on L-Jet information than for D-Jet. There are no hose schematics with the clarity of the D-Jet layouts for the L-Jet. Secondly some of the information on the L-Jet is misleading.

First thing.

car 1974 1.8.

Green vacuum line from Distributor.
Seems to be the same as the D-Jet cars.

There is a green vacuum (retard) line out of the distributor body to the throttle body.
I think i am right saying its the retard side (sometimes gets dyslexic on that).

The green line in this photo is an original vacuum line. Along with the crankcase vent hose these are the only two lines i did not replace on my car. The crankcase line is moulded to an S - shape and we decided to stay with the original. its still sealing ok.
Same with the distributor line. We checked and still pliable and it was sealing so it stayed. We cleaned it up a little. I also left the intake manifold seals on as we did not go that far in - requires disassembly of the intake manifold. They are still in good sealing condition though looking a little aged.

There is a black vacuum (advance) line out of the distributor to the throttle body.

The green line from the distributor was the only colored line still apparent on my car.

[wonkipop]

the above error in the factory manual gets me to something that has been puzzling me since we re-newed most of the vacuum lines and hoses last year.

this "decal" valve was just floating around in the rhs of the engine bay of my car, not attached to anything. both i and my mechanic were a bit troubled by this as we could not believe either porsche or vw would do this. i've been looking at it ever since. its always been there like that since i bought the car 31 years ago and i had no real cause to think about it until the hose renewal work last year.

as part of the work we did on the car we also had to change the fuel pump as the original was kaput. i am attempting a rebuild of that original fuel pump but for now we have plumbed an in line 2 port pump replacement. we incorporated a high pressure fuel filter into the fuel system after the pump as that is good practice (porsche themselves began to do it on later cars like the 924). we mounted that fuel filter off a handy bracket just behind the battery mount tray which had a handy hole already in it.

i now realise that bracket and hole is where the desal valve should mount. and the desal valve itself has an inbuilt bracket. except the one i am looking at in my engine bay doesn't have a bracket and the more i look at it, the more it looks like a fuel pressure regulator that has been plumbed in there. i am going to try and get to the bottom of it today with my mechanic.

if it is a fuel pressure regulator it does not seem to affect the engine running or coming off revs. mystery for the moment.




i have noticed searching around on the web that in this image, showing at 2.0L motor there is a very similar looking valve installed as the one floating in my engine bay.