2001 Duramax LB7 P0093 code "LIMP"
 

This first happened about 11- 12 months ago. It was a real shooker seeing i had never had anything like this happen the first year i owned the truck. Of course i was in the process of towing my 16' Haulmark enclosed trailer weighting about 8500 lbs. So i pulled over not knowing what was gong on. I was using a Superchips tuner so i was able to pull over and clear the code. It didn't happen again for about a month. than 3 weeks and so on until i talked to a few owners of a Duramax and the reccomended a replace the fuel pressure regultor. Wrong. Still happening and it wasen't a fun project at that. Did a pressure test using the test port and found a bad fuel filter housing so i rebuilt it. Still leaking so i replaced it along with all the rubber fuel lines. Well no more lose of pressure from that end. Truck still limps and now its about every 100 yards. I left out the replacement of the ECM & PCM from Calibrated Diesel. Great guys there. EFI Live is awesome. I was able to eliminate injectors as the problem. So now i have had a lot of knowledgeable guys telling me to replace the fuel pressure relief valve. It does make sense because i was told the more pops the weaker the spring gets and than stopps reseating properly. I have the duramax shop manual but just can't seem to get a definitive answer on the location. PPE seems to make them for LB7 but the 01 is different than the rest of them. So i'm going to try thee guys at Calibrated Diesel because they also sell thier own version of one. I do a lot of highway driving and that really when it happens the most. I know i kind of rambled on but i wanted whom ever ead this to know that i have tried other things.
Can anyone help me???
Thank You
Mark O.