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*UPDATE* I finally got around to installing the replacement ACDelco EP158 lift pump. This pump blows the SSdiesel out of the water! I was getting ~3.5 psi on the SSD lift pump and the EP158 registers over 5 psi on my fuel pressure gauge. When driving around with the SSD lift pump, I would...

anyone know of GMTDScan Tech being put on an android phone such as a Samsung Galaxy Note 2?

It may be worth a try to hunt down a buddy that would be willing to let you try his PMD.

That is odd. But does describe the signs of a faulty PMD.

Any progress?

Yep, I usually keep a paperclip in the ashtray for this very reason. Acts as my OPS jumper to get the lift pump powered up when the OPS goes bad and also use it to read the trouble codes.

Oddly enough, ever since Sunday, DTC 15 hasn't reappeared.

Have you checked to see if there are any Diagnostic Trouble Codes being stored? Could reveal something... just a thought.

Thanks Leroy!

I'm hoping so!

The AC Delco OPS went in this weekend. So far so good. Currently waiting on Leroy's lift pump relay.

Have you reviewed my post that dealt with your similar issue? http://www.thetruckstop.us/forum/threads/got-slimed.44150/ Possible that your fuel tank is slimed up? Your symptoms point to air in your lines though.

I would check the tightness of the fuel line fittings up stream of the fuel filter. A small o ring could have popped off the end of one of those lines or may just need a little more tightening to squish the O ring more. You should have fittings to tighten at the fuel sending unit and both ends...

Please don't take this as an insult but did you make sure that it was keyed properly? They only go in one way and the notches need to line up. I also can't remember if there should be an o ring to help seal things up...

When was the last time you removed/replaced the fuel filter? Do you have the new style where it doesn't use the separate ring to secure the filter down or the original where it still uses the ring? I was having the same problem as you because I didn't tighten down the fuel filter enough which...

I have the single thermostat 195* AC Delco ones that leroydiesel.com sells. ACD#12T45E / GM#19114513

NVW, thanks for the link. THEFERMANATOR, you learned me something! Never heard of that before. I'll have to check it out. How do I ohm out the the ECT sensor? Put my multimeter leads on the ECT sensor and block? I've never seen a sensor on my coolant crossover tube but I'll check again. I...

NVW, yes got it I have the list and actually used GMTDScan Tech to read and clear the codes but what I'm looking for is the cause of the code. IE what causes a DTC 15 - Engine Coolant Temperature (ECT) Sensor Circuit High (Low Temp)? My ECT reads and acts normal as far as I can tell.

Trying to diagnose this recent recurring code. Thanks guys!

Amazon and rockauto are good places to look