Originally Posted by AaronHenman

Hi All, and thanks in advance.
I have a 2010 Santa Fe with D4HB engine (the later engine with longer glow plugs). I'm now at a desperate point! It all started with taking a bit longer to start every time, got to the point of driving and it would restrict the RPM and power WITHOUT the engine light coming on. If i pulled over, turned off & restart, it'd be fine for a while.
progressed to if engine was put under load (3rd gear trying to accelerate) it would lose power & stall (engine power, not electrical).
it's now got to the point of can start if I give it a sniff of brakeclean, but soon as brakeclean is gone it will stop.
fuel pressure (via obd11) is reading 470kpa before cranking, reaching 1200-1500kpa while cranking, and when starts with brakeclean will reach 4400 then just drop to 470kpa. Which of course it stalls.
Battery good.
I'm assuming pressure sensor is ok as it's reading on obd11.
Pressure reg on fuel rail is receiving voltage during cranking.
Pressure reg audibly operates when external voltage is applied.
Solenoid on high pressure pump is receiving voltage. Unknown if/what this Solenoid does.
remove fuel line from filter outlet, plenty of flow from low pressure pump.
remove return line from fuel rail, same delivery as from filter (i would have thought no return flow until pressure is built in rail.).
I'm super desperate for assistance as I'm 100kms from nearest dealer. I have plenty of mechanical knowledge so I can check anything recommend.
Thanks again, looking forward to hearing some ideas.