13-06-2014, 01:47 PM
Could quite easily be the lp pump... If there's a fault on the low pressure side, it'd struggle to build pressure also since the supply of fuel into the pump is low, once the hp pump speed is up and it's able to pump faster, it'll eventually start... If the hp pump is struggling to make 298bar with no injections, there's 100% no way it'd ever run, soon as the injectors run, it'd never be able to make the requested pressure, it'd instantly drop and be way under the request amount...
Essentially what you're telling me is that at no load, the hp pump is struggling to make enough pressure to start, yet eventually start and run and make at least more than the 300bar starting pressure and only sometimes cut out when driving which means it'll make 900+bar...
Seen this on multiple Hdis and my own.. Struggling to start, sometimes cuts under load, replace lift pump, problem solved... They're a known weak point, many many people have seen this issue it been solved with a Lift pump...
Essentially what you're telling me is that at no load, the hp pump is struggling to make enough pressure to start, yet eventually start and run and make at least more than the 300bar starting pressure and only sometimes cut out when driving which means it'll make 900+bar...
Seen this on multiple Hdis and my own.. Struggling to start, sometimes cuts under load, replace lift pump, problem solved... They're a known weak point, many many people have seen this issue it been solved with a Lift pump...
