The Water in Filter (WIF) sensor at the bottom of your factory filter is disconnected. This sensor can be saved or discarded as it will not be re-installed. (Removal of the WIF sensor will not trigger a check engine light.)
Many will argue that the stock Duramax water separator is marginal. In our opinion, you’re better off running a quality fuel additive that totally disperses water like XDP’s Diesel Power Plus additive. This concentrated formula offers a combination of ingredients that not only improves lubricity, fuel economy, and overall performance, but also offers a number of preventative properties to help keep your diesel engine at its optimal performance. The fuel treatment comes in a 16 ounce bottles that treats up to 500 gallons of fuel. (Made in the USA - Item #XDDPP116)
Diesel fuel can begin to cloud around 32ºF and gelling can begin as high as 10ºF - 15ºF (depending on fuel quality and location). Gelling of diesel fuel can only be avoided by using fuel additives to lower the cloud and gelling point of your fuel. Running untreated diesel, in these weather conditions, can clog filters regardless of the filter micron.
Absolutely, the XDP Duramax CAT Adapter can be run on vehicle with or without aftermarket fuel systems.