Depends on the fuel system and flows on whether or not you can tee back to the lift pump inlet. On a common rail fuel system the lift pump supplies high pressure fuel pump and most are inlet metered (the restrict flow through a fuel control valve on the inlet side) to maintain rail pressure with lots of fuel maps and algorithms. The excess lift pump flow generally goes back to tank. Some flow goes to cool the HPFP an injectors and picks up some heat. Depending on the injector design you have some injector spill which is scalding hot but on some of the newer systems they have ZSL (zero static leak) injectors which barely have any spill at all. Depending on the lift pump flow and how much cooling flow for pump and injectors and injector spill going back you might be able to get away with a tee back to inlet of the lift pump. Priming after a filter change becomes an issue because there is no way to prime the circuit without having to open the line at the HPFP inlet to let air escape. You can use a bleed orifice in the filter base or at the hpfp inlet to let air out and send that back to tank along with the hot fuel from pump and injector cooling and injector spill. Recirculating excess lift pump flow on engine will do wonders for fuel system component life but will shorten filter life as you're actually getting the dirt in the filters instead of passing it through.
If it's an older pump and nozzle system you can just recirculate fuel but still have the same priming issues.
Unit injector systems really need fuel to go back to the tank to cool off or will need a good fuel cooler.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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