I would plumb the coolant lines, but its alot of work to do especially since the weather only gets into the 10's at night here, but its usually 40 by day time, my issues is starting up in the morning since the trucks is usually as cold as it is outside when i leave work.We do have an electric fuel heater that can be installed in the pump, you can put two of these heaters on the Titanium unit. The electric heater is only designed for a really cold start up. Say your water separator freezes, if you have the heater then you can flip a switch and thaw it out and be on your way. You can leave it on all day but it will not heat the fuel while the truck is running as the pump is flowing too quickly and the heater does not have enough surface area.
If you want to heat the fuel going down the road you can always run coolant lines to the "H" ports on the pump and have a ball valve to shut the flow off for the summer.
Now these heaters don't produce enough heat to heat the fuel when its running you say? what about running dual heaters, one on each filter?
tell me about it, i lost my warranty card about 4 days after i installed the fuel pump:banghead:, my mom and g/f cleaned out my office and i never saw it again. I came back from vacation and couldn't find it, been two years and the pump is still running strong thank god!Yes these pumps are lifetime warranty as long as you own the truck and it stays on that truck. Which ever company you decide to go with please be sure to mail in the warranty card, it is less than $1 to do so and will save you a lot of trouble if anything should ever happen.