O rings and engine oil? - Ford Powerstroke Diesel Forum
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Old 03-11-2012, 11:27 AM
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O rings and engine oil?

When I picked up my new truck I had the dealer's mechanic show me where the 2 fuel filters are. One mechanic asked another how many there are. At least the 2nd mechanic knew how many and where they were. He also said that when changing the filter on the engine mounted filter to lube the oring with engine oil to keep from tearing it when putting the housing back together. Does this seem right? I'm concerned about contaminating the fuel with the oil. I know the engine will burn the oil ok, but what about the fuel pump? Will it handle any oil in the fuel?
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Old 03-11-2012, 07:29 PM
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Its always a good idea to put some lube on the o-rings. Helps them seat better and ensures they seal properly. A little bit of clean engine oil isn't gonna hurt a thing.
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Old 03-11-2012, 07:37 PM
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Your over thinking this a little too much. The amount of oil that may potentially be introduced into your fuel system isn't enough for the high pressure fuel pump to notice. Personally, I use light grease.
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Old 03-12-2012, 06:06 AM
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I use a silicon grease on mine only because we have a lot of it at work but you need to lube it up with something or it may stick and get pinched causing a leak.
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