Hey I need some help. i recently bout my 2001 duramax. i put the bullydog dp tuner on it and a intake. I have recently found that when i put the tuner to the extreme or performance mode and stomp on it at about 70-80 mph it throws a large fuel leak code and a glow plug/ heater curcuit A codes. and i'm not leaking fuel anywhere. after it throws the codes it pretty much won't take any more fuel but then i reset the codes on the tuner right after and its fine again till i start pulling a load on a trailer or stomp on it like i said. does anyone know what kinda problems i might have.. thanks.

 

your rail pressure is dipping too low on the higher settings, change the fuel filter first, if that dosnt fix it then you might get away with adding an aftermarket lift pump to fix it, that is assuming that your cp3 and injectors are in good shape and not excessivly worn and causing the low pressure problem

the glow plug code is possibly the module

 

alright well i change the fuel filter on it bout everytime i change the oil, so i don't think it is that. but ya i'm putting a air dog pump on it in about two weeks maybe that will solve that problem.so what were you saying about the glow plug module. where is that located.