We had the same problem, it was the seals in the ditech fuel injection system. We bought the proper Suzuki seals at £60ish + vat which worked. however providing the spacer seal is ok (this seal stops the unit pulsing in & out) then you can just use ordinary rubber 'O' ring seals, these cost pennies!!!.
Best of luck
Regards,
Colin
colin richards
February 2008
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