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Thanks for the ideas... I've run the lift pump for 30-60 minutes and everything is dry. I can't find any leaks on the lines anywhere. The pump keeps "ticking over" every 3 seconds, but no leaks. Chaz, if the pump achieves a pressure of say 4psi, and there are no leaks in the lines, should it continue to tick over, or should it be relying on a one way valve to hold that 4psi pressure, and hence not need to tick over any further?
As a side note, my auxillary tank got some pin holes in them from rocks, in November. Welded a couple of them, but the tank is still leaking, so will need to fix THAT diesel leak, more...
Back to the pump, the more I listen to you guys, the more I believe the pump is NOT the problem. Considering I can't find any leaks anywhere from the rear, up the lines on the chassis, past the filter head and water separator, nothing around the injector pump and so on, I am continuing to be disheartened by this because nothing is identifiable... Why can't these things be a little more easy? I am not a mechanic and have no real idea what the heck I am doing... I normally work on people's broken bones & illnesses... not 4WDs...
I haven't run any spanners over the injector pipes, but can't see or smell any diesel leak in and around the engine bay, even if minor I should be smelling fresh diesel...surely...??
Big Fletch, thanks for the information... it gives me some hope that I can resolve this issue without paying $4000-8000 for an exchange or new pump, like Nissan and the individual diesel specialists were suggesting. I had to spend $8000 5+ years ago due to water going through the pump.
I've had a look around the vacuum lines, intercooler pipes, dawes valve etc and can't find any hoses split or disconnected. I plan to check the turbo, at some point when I get time.
Will continue to give you feedback for all of your suggestions and guidance.
Thanks guys, I really really REALLY appreciate it, even when frustrated. It keeps giving me a little bit of hope each time. Thanks fellas!! This has been such a mental strain and frustration for months now, particularly when "bucking the trend" or going against suggestions that I should be just replacing the pump and all would be resolved, as the "specialists" have recommended.