Diesel Bombers - Help, towing issues

I posted a thread regarding some issues I have been having with my 2001 duramax silverado. If I drive it without towing, she drives amazing! Starts right up with no problems, does not smoke, maybe a little back with the stealth 2 chip @ 70hp setting, but nothing I would not expect with that chip and a heavy foot. The first time I towed with it, we had our 21 ft travel trailer and it went into limp mode....Oh Yea, she's all stock with a stealth 2 chip and 33 inch tires. The first time I towed with it, we had our 21 ft travel trailer and it went into limp mode while going up hill. I pulled over, read the code ...0093= fuel system leak. I contined on after I cleared the codes and it seemed like once I got between 65 and 70 mph, or a step hill, the truck was real sensitive & would throw the code 0093. I turned around and went home and parked her till we got back from our vacation. Intersting thing is that when I got off the freeway and drove on the back streets/highways It never threw a code. Once I got home, I hooked the trailer to our tahoe then contined on our vacation.

Now, when I first got the truck with 220K miles on her, I got a code 0089 = FPR. So, when I got home from vacation, I pulled the FPR and put in a new one with a new fuel fiter. I also did the shim to the FPRV. I took her out for a test drive with the travel trailer in tow. I hit the first hill where my truck got the code 0093 and went into limp mode. My truck pulled that hill like nothing. I thought, I hope she is fixed! I contined for another 15 minutes and once I hit 70, I was able to sustain that speed with no codes for about 5-10 minuts. Then, I got the CODE 0093 :s: I was pissed! I turned around and went home.

I hooked up my Stealth 2 programer to watch what the fuel pressures were doing. The stealth 2 programers let me see the duty cycles of the injectors which all were the same values, 4.4-9.2 area. There are two fuel pressure readings One is Fuel ACT and Fuel DES. I have no idea of what the values represent? It seemed that when I was going up hills, at first, my fuel pressures read Fuel Des - 3055 and my Fuel Act - 2488. Granted, these values did jump around a lot. I had no problems on this first hill when I pulled these values from my stealth 2. Durring Criuse mode at say 68-70mph, these values read Fuel Des - 1800, Fuel Act - 9300, however they also seemed to read really consistant while at 60mph between Des and Act values of 4500-7500psi.
Now, when I hit some larger hills, my F-Des read 1800ish and F-Act - read 9300, yet would bounce around all over the place.

I have no idea of where to start troubble shooting this problem. Of my many searches, I have found it could by my CP3 unit. I am wondering how to check the fuel pressure from the fuel pump? Is there a shrader valve where I can test this pressure and what is it normally supposed to be? Also, is there a way for me to check the CP3 unit? if so, HOW?

Anyother ideas of how to fix this code P0093 would be greatly appreciated!

Thank You!:tu:

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Looking at my Stealth 2 programer, this is what I think is going on...OK guessing.

My Fuel Des and Fuel Act are my fuel rail pressures. I see massive fluctuations on both values. I see consistant 3000PSI @ 60mph on a flat road. On hills the Des value is way low say 2000psi and the Act is way high....9300psi.

I"m still unsure but think the high pressure side is the problem, cp3 due to the large fluctuations of my fuel pressure. The low pressure side is getting fuel to the CP3.

I just don't know how to properly test the CP3 and the low pressure side of the fuel system......anyone care to help?

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Anyone...Help PLEASE:(

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Man, don't all jump in at once:dang: