O.k. I replaced the E.H.A. unit, since then the idle speed has increased by 200 r.p.m. on idle.(from 650 to 850)
The only other thing I found was a lot of rubbish in the in-line
filter where the line goes into the metering head. Can anyone suggest what could be causing the high revs.
By the way I tried the old E.H.A. unit which was originally leaking, thinking maybe the new one was faulty ,but the r.p.m. is still the same and to top it off the old unit doesn't leak anymore so I'm presuming by cleaning this filter it's relieved any pressure which had built up and caused it to leak in the first place.