Strange Fuel Issue om642 519

[blfmtriv]

this is a strange phenomenon, travelling outback Australia, the van starting running rough and stalled a few times, plugged in my ICARSOFT and found low pressure side was falling below 90 psi and long starting cranks to restart
thinking an injector has failed i panicked
some of the symptoms i found
at 300 psi the engine would start (normal) , watching the rail pressure while driving the pressure would radically spike between 15000 psi to 250 psi, and fuel economy was shocking at 19ltr per 100

what surprised me is , i refilled the tank and added fuel system cleaner, drove the van 120 k,s and worked it hard up the hills to get maximum fuel flow
, now i have now problems again

my question is
can an injecter rectify itself with a fuel clean or do i have a sticky pressure regular value or other, etc

your thoughts appreciated thanks Andrew

 

[MASTER THIRD EYE]

Bump.

 

[Sockeye770]

Without knowing the answer to the problem.
I would start by changing the fuel filter.

 

[blfmtriv]

Without knowing the answer to the problem.
I would start by changing the fuel filter.

gday all, Sockeye, have changed fuel filter, also found that the T connection from injector bypass to filter was leaking, rectified this issue, but the hard long starts have returned,
beside a leak off test is there any diagnostic tools that can identify a bad injector?
i,m watching the 2 main fuel valves at the moment , and trying to look for a OE figure of EOKO, AND IDLE,
has anyone got thefigures or where i can find some info please

 

[blfmtriv]

Ok problem solved with the long cranking and fixed, i replaced the pressure control valve, removed the fuel rail and unscrewed the valve, put it on and tightened it up, bled the system and started up, haven't had a problem now in approx 5000 ks of driving, i did not replace the whole fuel rail and sensor that Mercedes wanted, purchased the sensor from Germany, o ring from Audi QLD, and tightened it in, also after deliberation i did not do a teach function as i didnt have the proper gear, i left it up to the ECU to trim if it needed.

 

[kookin]

How much were those Parts?