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Old 01-05-2015, 13:02   #1
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The final fuel filter

First fuel filter is a 30 micron pre-filter water seperator, Fuel Manager 100 series then to a Rayco 2010 2 micron filter. The last filter is attached to the engine. I have changed the first 2 filters but before I go for the last filter which is below the first 2 filters (I first shut off the diesel fuel flow at the tank) I am wondering if the contents of the first 2 filters will flow out when I loosen off this last filter. It does not have a fitting at the bottom of it to turn and drain fuel as the other two.

... thanks

The engine is a 2010 Isuzu 4 LE 4cyl 48.1 hp
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Old 01-05-2015, 16:50   #2
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Re: The final fuel filter

If you are lucky, you will only get a little. You need to crack the fitting at the top to get a good flow going. I installed a spin-on filter at the engine that has a drain on the bottom. You get a good sample but it would take a while to drain 1 or 2 big filters upstream.
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Old 01-05-2015, 17:02   #3
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Re: The final fuel filter

Odd you have 3, but if the middle one is really 2 micron, I doubt there will be anything in the primary.
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Old 03-05-2015, 07:04   #4
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Re: The final fuel filter

With two 2 micron filters in a row, the second one should never get anything in it. It would be there only as a backup in case the first one failed, but you shouldn't just leave it in there forever, either. A more logical setup for three filters would be 30-10-2 for progressive filtering.
There shouldn't be much fuel flow if no air can get in upstream. Have a can ready to catch any, and if a lot comes out you have an air leak that must be fixed or the engine won't stay running. This happens a lot when changing filters.
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