I'm under the impression that you have to bleed the air from the system when replacing a fuel filter in (some?) diesel engines, which has me concerned about starting my FD with a new filter.

Haven't found any indication that this is a concern in the shop manual or searching the forum, so probably asking for confirmation of the obvious, but if there's no need to bleed the air out, where does it go? I would think the air would be injected, causing the engine to run lean and possibly blow an apex seal.

If this isn't a concern, great--but would like to understand what happens.

Sort me out?

Thanks

 

no a concern. the FD has a recirculating fuel system, there are two lines, the fuel feed, and the fuel return. so the fuel gets pumped to the filter, fuel rail, injectors, and the pressure regulator, and then after the regulator its just returned to the tank, so its self bleeding

diesels, do not have the return line, so they aren't really self bleeding if you get air in there

 

Thank you!