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The low pressure oil pump sends oil to a reservoir for the high pressure oil pump to take suction from, so they are not entirely independent. Most of the time, a low pressure in the "high pressure oil system" is due to a leak in the high pressure oil system piping (oil branch, STC fitting, oil rails, etc). Sometimes it is a HPOP (pump) problem.
As I said, you can pull the connector off of the ICP sensor and see if it runs. If it does it could mean you have a bad ICP sensor or connector. Sometimes, due to an o-ring failure in the sensor, the connector and wires become oil soaked and need replacing.
Low pressure in the high pressure oil system does result in low fuel pressure through the injectors. The high pressure oil provides apprx 3700 psig pressure to an "intensifier piston" in the injectors. The intensifier piston increases the fuel pressure by a factor of 7 or so (seven times the oil pressure equals about 27,000 psig fuel pressure).
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Mark
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Last edited by bismic; 07-24-2009 at 07:18 PM.
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