2003 Clio with 22,000 miles 2003 model cut out on m/way customer thought he heard it making a pinking noise as it cut out.Codes stored are 262(snappy code)fuel pressure regulator, have done an inj leak off test and no 1 and 2 inj are filling about 12-18 inches of clear leak off pipe in about 15-20 seconds of cranking no 3 and 4 hardly have half an inch.I have cleared code it does eventually return after 20-30 seconds of cranking my question is the code there because of excessive leak back ?? and would you change 2 or all 4 injectors as a matter of caution.Have done leak test with all inj disconnected. Regards John