just fiited new boost diaphragm its a bloody miracle cure much faster pulls better go,s uphill much better my 110 is much improved . It all started when i got a new lockable fuel cap noticed the tank was pressurising read the forum and symptoms suggested the boost diaphragm went to ELECTRO_DIESEL exeter the chap knew the part straightaway had it in stock £16.26 +vat .very fiddly to fit 2x9mm bolts 2x springs 1 diaphragm got it fitted not to bad just a bit tight for space. WELL WORTH DOING THIS my 110 is much better .

Agreed, had mine replaced last year as could actually hear the tank pressurising. What a difference to be actually using the turbo. I do 70 miles a day siting at 60-70 mph easily with the pump timed properly. Not sure if it was directly linked, but next problem was a leaking fuel tank !!