Join Date: May 2011
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I put additional fuel filters on the frame rails of my F250, along with an auxiliary fuel pump. This gives added protection to the injectors by helping assure the fuel is free of sediment and water. It certainly reduces the need for changing the engine-mounted fuel filter very often as that filter has virtually nothing to do anymore except act as something of a last resort...in fact, I now change it only because it should not be allowed to get excessively old (ie, maybe every five years or 50K miles or whatever seems right).
My particular approach was to install the following using diesel-rated fuel hose after the tank selection valve: first a 10 micron water separator/sediment filter, then an auxiliary fuel pump providing about 4 psi, then a 3 micron sediment filter, then plumb the hose onto the metal fuel tube going to the engine, which I had cut to install the setup.
As far as the 12-volt connection, I used a device to utilize one of the key-activated fuse ports in the cab. I forgot the name of the little fuse-box insert to do this, but it's available at the local auto parts places. It is comprised of a bladed plug that goes where the original fuse went into the fuse box, and it holds two fuses: one is the fuse for the original purpose, and the second is for the auxiliary pump. It makes splicing into the key-activated wire unnecessary.