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Old 01-29-2009, 04:36 PM   #1
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Location: Winter Haven Brownsville, TX
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How often should we be replacing the fuel filter on the side of the engine? The manual says to change the remote filter every 18K. No mention of the engine mounted filter. Just curious, it is a bear to get at on the 05 40 FDQS. I think I will need to remove the starter to get at it. The last time I had it serviced I am convinced they charged me for the filter and never replaced it.

After 900 miles it was filthy compared to the oil filter. They reside in similar spots on opposite sides of the engine. Just my opinion and that is why I am doing most of my own service work now.

Wayne & Kathy
05 Alpine 40FDQS #75330 Towing 24' car hauler, 2012 Spyder, 2003 Harley FatBoy
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Old 01-29-2009, 05:43 PM   #2
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That depends on the mileage interval. I change my car/truck/jeep fuel filters every 10,000 miles.

On our MH, I just changed it and will probably maintain the 10,000 mile or every 12 months whichever comes first rule.

I drain my primary fuel filter/water separator every 4 months. I only open the drain for a couple seconds though as any more and the engine will get air in the fuel lines.

1998 Gulfstream 36' Sun Voyager Bus Platinum
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Old 01-29-2009, 05:55 PM   #3
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I'm figuring a 2 or 3:1 ratio- change the engine filter @ 2 or 3x the change interval of the remote, but hit the remote at a comfortably small interval.

You can probably change the engine filter out from above (under the bed). That looks like the easy way on my rig. Just got to get it started.
Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
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Old 01-29-2009, 07:50 PM   #4
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My coach does not have access to the engine under the bed. My arms would have to be 4 feet long to reach it from in front of the closet. There is a small cover just in front of the closet that gets you to the bell housing area of the Alison. Not much access to the engine. I will pull the cover tomorrow and take a look.

I have paid to have it changed 3 times in 42,000 miles. Not sure how many times it was actually changed.

Quikduk, On the electronic engines the fuel pump purges any air in the fuel system during the 30 second wait to start time frame. That is also why Cummins tells us to install the filter dry. The FS1022 filter even has a warning printed on it telling us to install it dry on an ISC/ISL.
Wayne & Kathy
05 Alpine 40FDQS #75330 Towing 24' car hauler, 2012 Spyder, 2003 Harley FatBoy
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