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K-Jet metering needle removal

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Injection issues

Hi All, new poster here looking for some assistance please.

I have recently acquired a mk1 Convertible Rivage on a J plate.

Prior to me getting it, it had sat for 10years.

I have renewed the fuel pumps (in tank and main) and replaced the fuel filter.

Currently, I have not been getting any fuel out of the lines to the injectors, despite the fuel getting to the metering head inlet ok.

I have also a fitted a new injector to number 4 to check for flow at the injectors.

No fuel appears to be getting to the injectors, but the car will cough on the fuel from the cold start injector.

I have removed the metering unit from the car and found the following:

1. There was pressurised fuel at the union for the cold start injector

2. There was NO pressure at the 4 injector lines

3. The disc/flap meets no resistance from the metering pin when I move it

(Video here)
MK1 golf fuel distributer strip down pt1 - YouTube

IMG_20191007_182418.jpg

Next, I'd like to try and get to the metering pin - how does the unit come apart? I can see two torx head screws, but they don't seem to go through to the metal panel.

I'll also be ordering a new fuel relay and will try that prior to taking the unit apart, incase the pumps were not pressurising correctly

Thanks

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The needle should just pull out. You might have to remove the thin metal retainer. Do not split the unit - they are very difficult to get to seal after. If the flap is meeting no resistance it sounds like the needle is stuck in the up position which would usually mean its flooding. If its not stuck and moves freely i would also check the small gauze filter in the wur  which is located behind one of the banjo bolts. These can get get blocked and upset the control pressure which acts as resistance on the kjet needle depending whether the engine is hot or cold.

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Yomp said

The needle should just pull out. You might have to remove the thin metal retainer. Do not split the unit - they are very difficult to get to seal after. If the flap is meeting no resistance it sounds like the needle is stuck in the up position which would usually mean its flooding. If its not stuck and moves freely i would also check the small gauze filter in the wur  which is located behind one of the banjo bolts. These can get get blocked and upset the control pressure which acts as resistance on the kjet needle depending whether the engine is hot or cold.

Thanks for that, much appreciated.

The thing I am uncertain of is how do I remove the distribution unit (where the injector lines etc fit) from the metal frame it's sitting in?

I know to keep the injection unit in one piece, but how does it unscrew from the base plate so I can get to the needle ?

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three torx screws mate

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mete.jpg

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Thanks,

I can only see two torx bolts though? The one you marked and one opposite? As per pic below.

Appreciate your help on this!

IMG_20191010_200334.jpg

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needs to come out mate

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as the dentiist said  :lol:

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nicci21paul said

needs to come out mate

What does?

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I got a spare metering unit off a friend's Volvo 740

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The car it came off ran, so it was a known good unit.
All the outlets are the same as the one on the golf, so I was hoping it would show whether the metering unit was at fault.

I got the bolts all swapped over and fitted the unit to the car - it's just plumbed in and not routed correctly (incase I need to swap the original back in), with injector 4 going to a bottle so I can see if it gets enough pressure to open.

IMG_20191012_125618.jpg
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We got…

 

Nothing.

 

There was no fuel in the test bottle, and I could only hear the pumps running intermittently.

 

Time to turn my attention to the fuel pump relay. Logic being that the metering head needs to be able to provide 75psi to the injectors to get them to open.

The lack of any fuel in the test bottle suggests we are not getting sufficient fuel pressure at the metering head.

This could be either due to the fuel relay being intermittent, or the main pump not providing pressure.

Tucked up in the passenger footwell, the relay is easy* to reach.

Initial inspection showed signs of rusting - never good

IMG_20191012_134741.jpg

After some gentle persuasion with a screwdriver, the relay was out

IMG_20191012_143247.jpg

Time to order a new one then.

As a final hurrah, it also decided that it'd like to make some horrible noises when the starter tried to engage..

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