there is a micro filter deep down inside the pump under the inlet banjo pipe. The area needs to be spotless clean and great care taken, remove the banjo and make up a hook tool to with draw the filter, clean and refit. causes loss of power and a stutter and acrid blue grey smoke !
There was a post a few weeks ago and the guy did the above and he posted back to say yep it fixed it. he did admit it was a fiddle and I think if you find the post there is more detail.
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