I rarely change mine. I find that I'm more likely to cause a problem by messing with them than leaving them alone. The engine mounted filter is 2 micron IIRC and the engine can draw up to ~ 1 gallon per hour. The upstream Racor can be 2,10,or 30 micron and is rated at 15 gallon per hour. Many people will run a 10 or 30 micron to get the big chunks... I run a 2 micron to protect the engine mounted filter. Some people worry that that will cause too much head loss and poor engine performance. I say that with a design flow rate ~15x that of the engine consumption you would have to be at filter end of life or have a sever fouling incident that was going to shut down the engine one way or another.
I run a suction pressure gage on the racor and monitor how it changes over time. If the engine has to start sucking harder then it tells me that the filter is getting fouled. I keep spares but typically some other fuel system maintenance is going to admit air in the system before the gage tells me it is time. I probably got better than 4 years out of the last one and the only reason I changed it was because it I was doing other fuel system work. On Yanmar engines the bleed screws on the engine mounted filters are notorious for stripping and/or leaking. I don't touch them. I vent at the banjo fitting on the high pressure injector pump. If you have copper washers then you would have to replace the washers at this time. See how changing the fuel filter just messes everything up?! If you replace the copper washers with seal washers then you can reuse them successfully many times. Videos below show suction pressure gage mod, seal washer mod, quick and easy fuel venting mod, and finally the seal washer venting location/method. https://youtu.be/H-GI38vE4hQ https://youtu.be/F7KD1_EZmU4 Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Sat, May 23, 2020, 12:59 General Gao via CnC-List <cnc-list@cnc-list.com> wrote: > Hi everyone, > > Just wondering, how often do you have to change diesel filters? or how do > you tell it is time to change? > > Thank you, > > Bo > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
