Bosch K-onfusion

[Stog]

Hi folks, im trying to get my poor wedge back on the road for the summer. I'm halfway through a complete rewire and it's going well except for one wee snag. I'm using the black loom wiring diagram from the bible and it has a safety switch / air sensor that I can't find. I'm assuming it should be somewhere on my air flapper to cut the fuel supply if the engine stalls. I've pulled out my fuel distributor and gone over it a half dozen times trying to find anywhere an electrical connector might attach but there's nothing.
Now I know there was a new engine put in this car and I've no idea what it came out of, is it possible that it came from a car that uses a different safety system or did all Bosch k systems use the same switch?
Any thoughts?

[Wedg1e]

As I recall, my Tasmin had such a connector, it was on the airbox.
You could just stick a link in it for test purposes

[Stog]

Wedg1e said:

As I recall, my Tasmin had such a connector, it was on the airbox.
You could just stick a link in it for test purposes

It looks like that's what a previous owner did

Edited by Stog on Friday 22 May 16:25

[mrzigazaga]

Hi mate...Not sure if the Sierra had them..Mine used to have a green two pin connector plug on the metering unit housing..Just under where the rubber cap connects to the air intake pipe.
If someone has used a later metering unit then its possible that it wasn't fitted with the fuel cut off....I used to run mine without it as it would start a lot quicker without it...Ziga

[Stog]

The green plug was dangling off the loom but there's nowhere to connect it
I guess I'll just leave it out. As its there in case of a leaking fuel pipe added to the fact I found a small crack in one of them today maybe it's time to replace them. It was on my list anyway, it looks as though the fuel lines from the distributor were grafted on to wider lines going to the injectors. Are these fuel lines a standard size?

[MJG280]

I remember trying to sort this in the distant past The green plug was disconnected as it wouldn't start otherwise. The bluish coloured bit at lower centre is the socket.

[Stog]

MJG280 said:

I remember trying to sort this in the distant past The green plug was disconnected as it wouldn't start otherwise. The bluish coloured bit at lower centre is the socket.

Just had another look, definitely nothing there. By the sounds of it I might be better off without

Edited by Stog on Friday 22 May 22:41

[mrzigazaga]

Hi mate...The plastic high pressure fuel pipes are 6mm i believe with a 4mm ID...There was a kit for Ferrari that was a press fit plastic hose kit..Not sure if they are still available, I did see a 280i at a Wedgefest with steel fuel hoses made and have seen a Capri with a Goodrirdge custom copper/Alloy...
I have some left over from my 280i days and can probably get some from the Ford garage if you need them..I have welded a split with an old piece of the same fuel line..I cut a small section and grafted it over with a soldering iron..It sorted it for good...

Here was a forum discussing the options...
https://www.google.co.uk/url?sa=t&rct=j&q=...

[GBinUSA]

Thanks for posting those dimensions Zig, been research replacing those myself. If you google....

Fuel line tubing cis

You get a whole bunch of info on sourcing the lines. Lots of Porsche, Ferrari, DeLorean owners going through similar pains.

[Stog]

Nice one Zig! I'll have a look under the bonnet tomorrow and see what needs replacing.

[Wedg1e]

From what I recall, the later version of the 2.8 injection system used a module that sampled the ignition pulses and used that info to control the fuel pump - in much the same way that the V8's injection won't inject if the ignition's not working properly.

[Stog]

Wedg1e said:

From what I recall, the later version of the 2.8 injection system used a module that sampled the ignition pulses and used that info to control the fuel pump - in much the same way that the V8's injection won't inject if the ignition's not working properly.

In the bible there's also mention of a purple / cream special relay but I've neither of those. Any idea what the module looks like? If I had a wiring diagram for an alternative I'd retro fit it. I imagine it would take longer to start the engine if the fuel pump didn't run until the coil was firing. At the moment the pump just starts up when the ignition is in the first position.

[Wedg1e]

Stog said:

At the moment the pump just starts up when the ignition is in the first position.

Aye, it would do if the airflow meter connector is linked out.
I thought the fuel pump module was either green or pink but it's been a long time...

[Stog]

Here's my current relay setup I'm in the process of building a nice new one.

[Stog]

I'm not sure what the little thing on the bottom left is, says otter on it?

[mrzigazaga]

Stog said:

I'm not sure what the little thing on the bottom left is, says otter on it?

Could be a headlamp diode..I had something similar on the 280i..Mine was attached to the rad upright support on the N/S..And was white-ish...

[Stog]

Could be zig, I'll test it out of curiosity but I've nice new diodes to put in

[wedgemaniac456]

Always thought an otter switch was to do with a cooling fan but could be wrong .I have an old wiring loom on my 280i which has that green plug,plus all associated fuses etc.Prob not going to use them if you need something stephen.

[Stog]

wedgemaniac456 said:

Always thought an otter switch was to do with a cooling fan but could be wrong .I have an old wiring loom on my 280i which has that green plug,plus all associated fuses etc.Prob not going to use them if you need something stephen.

Thanks Sean, I've most of the new wiring in now and I'm replacing absolutely everything I can with new parts but if I can't source anything I'll give you a shout. When I get it back on the road we'll have to meet up for a burn
One thing you might be able to help me with if you have an old loom, I'm a bit stumped with the wiring to the motorcraft module. According to the wiring diagram in the bible the red wire goes to the starter solenoid but every other wiring diagram I can find on the web white one does. Do you know where your white or red wire go?

[Wedg1e]

Stog said:

I'm not sure what the little thing on the bottom left is, says otter on it?

Thermal cut-out for the rear screen demister.