Originally Posted by
haz87
The plungers stuck, and that sounds like you've probably just scratched the fook out of the internal bore

This will definitely be the issue, the plate should be horizontal/flat and happily lift up then naturally drop back down into position.
I thought you'd already swapped metering units? Perhaps your original was actually ok - theres equally every chance youve got 2 knackered ones - they dont like sitting!
They can be opened up and sometimes salvaged if its just grime or fuel varnish, but if the bore is scratched its as good as fit for the bin, they are machined with the plunger to have an exact fit, you can't switch them about, it wont seal
If you were closer I would have just come and had a look - i hate diagnosing/explaining K-Jet over the internet, its an arse of a system to describe

Your doing a good job of explaining , learning me loads lol. Your no gonna believe this though.. i put the original back on and sold the other yesterday , it ran a little worse with it.
I didnt push it all the way down just about a cm , theres defo pressure making it not go down though and when i watched it it didnt move a mm.
Had a wee read about how it works in the haynes book , how do i get it to stay back down though? also il need to pick up a gasket for it.