I incorporated TRUE 3MIC filter in the system (when I installed the auxiliary system) and the factory intank pump couldn't pee thru it, again again I will mention this IF THESE FILTER(S) DID WHAT THEY CLAIM 90% of HPCR seller would be out of business.80% 0f the time I see contamination is relate to water, but my Bank account increase is liking the system now in place.MY 2003 with 147K has 76ML back leakage Rate, that's equal to Virgin/New rates, keep in mind that truck BD/Bank stacked for 8 years.
The 2013 system is improved and in most cases is adequate, WHY would I install auxiliary True 3MIC with Bypass 10MIC if I thought for a micro second that the factory setup is enough.
If I did not have the auxiliary system in place the 1st time the factory system failed, it would have needed to be towed, the intank pump will fail ....its only time that separates its failing. Now the intank pump must push thru 2 filters, Yes the GP produces 25HG but as soon as the frame mounted filter gets dirty it NO help form the GP to Tank, the system is is going to have some effect on the intank pump life.
1 other side point NEVER run your tank below 1/4 in fall and winter and try to keep 1/3 or more in the hot summer months, the hot fuel returning form CP3/Injectors will shorten the intank pump life.