yamaha 115 hp 4 stroke 2013

by Mark
(Australia)

my low pressure fuel pump on the engine is not keeping up fuel supply to the high pressure pump have changed all filters and lines /fuel primmer ect and even bought a new fuel pump but am still having the same problem
it is almost like the vst/high pressure fuel pump system is getting a back pressure in it that is higher than what the low pressure pump can pump
is this possible?
any help appreciated i am a mechanic by trade so all basic checks have been done it is something weird that is causing this problem
regards
Mark

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