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Old 11-28-2021, 04:35 PM   #1
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ISL9 separating fuel filter

Have a Detroit brand seperator on my freightliner chassis mh. Is there an easier way of changing without getting a bath? I loosened the fuel tank cap to relieve the pressure, parked so nose was lower , drained the bowl completely but the portion of filter that is in the header seems to be trapping about a quart of fuel thus upon removing the the filter fuel gushes out? Should I try draining the bowl with the seperator threaded a little loose to get some air above?

Any ideas?

Thanks John
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Old 11-28-2021, 04:39 PM   #2
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Sure.


Install a diesel-compatible ball valve on the primary fuel filter INLET.


Close it when changing filters or for a great anti-theft device.
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Old 11-29-2021, 04:41 PM   #3
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I don't believe a ball valve will make a difference as after the filter was removed no diesel leaked out I had filter off for an hour not a drop I guess cause I had the rear of coach higher than the tank and gravity didn't effect it. Seems there was fuel trapped above the filter in the header.
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Old 11-29-2021, 04:47 PM   #4
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Quote:
Originally Posted by Towboy View Post
I don't believe a ball valve will make a difference as after the filter was removed no diesel leaked out I had filter off for an hour not a drop I guess cause I had the rear of coach higher than the tank and gravity didn't effect it. Seems there was fuel trapped above the filter in the header.



OK, with no shut-off valve, you have a choice:


If the tank is higher than the filter, fuel will run out-- a lot of fuel.


If lower, fuel will flow/siphon back to the tank making priming a REAL JOB.
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Old 11-29-2021, 05:50 PM   #5
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Quote:
Originally Posted by Towboy View Post
Have a Detroit brand seperator on my freightliner chassis mh. Is there an easier way of changing without getting a bath? I loosened the fuel tank cap to relieve the pressure, parked so nose was lower , drained the bowl completely but the portion of filter that is in the header seems to be trapping about a quart of fuel thus upon removing the the filter fuel gushes out? Should I try draining the bowl with the seperator threaded a little loose to get some air above?

Any ideas?

Thanks John
Is this a spin on filter with a clear bowl on bottom...or a Davco setup with clear top?Click image for larger version

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Old 12-14-2021, 02:03 PM   #6
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Detroit clear bowl is on the bottom it seems like fuel is trapped on top of the filter element in the header
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