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Message: [QUOTE="2000wa250, post: 990673, member: 3399"] Only time I've ever seen those kind of numbers on my scan gauge (psi wise) were with an unplugged ICP sensor. Have you tried unplugging the sensor and cranking it so the pcm defaults and calls for the injectors to fire? My thinking here is your ICP sensor **** the bed, and is sending out a voltage the pcm/scan gauge doesn't know how to interpret. No signal from ICP sensor = no command to fire. If res is staying full there's two really only three options.... hpo leak (external would be obvious, internal is limited to o rings), pump is shot (oil is never leaving the res) or ICP is bad/pcm isn't commanding sticks to fire. Need to verify that pcm is sending the fire signal. Pull a vc and have someone crank while you listen. Should hear solenoids clicking. Or unplug ICP sensor and see if that changes anything. Depending on what you find easier, you can either pull the hpop or pull sticks to test for the first two options. Personally only time I've had a no start because of o rings the res would not stay full if truck was warm and sat for a decent amount of time. To test hpop pull it out, cover the intake hole with your finger (small hole to the 4-5 o'clock of the drive) and turn the pump over. If pump is dead, there will be zero suction. This is really obvious if you throw a pair of latex gloves on when you test it and cover the hole with your thumb. Fwiw my money is on no command to fire injectors. Sent from my SCH-I545 using Tapatalk [/QUOTE]

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