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2005 vulcan

I replaced the power steering pump. New part came with a Teflon O-ring that goes to the hi-P line. It is a little smaller in diameter than the threaded fitting. According to the manual, I need a special tool to install it.

1) Do I have to have a Teflon seal? Can I use an o-ring of the right kind of rubber resistant to oil?
2) Is the Teflon seal the primary seal or secondary seal of the fitting? Rephrased, without it, will the line leak 100 percent? I wonder if the fitting mating surface form the primary seal.

Thanks.
 

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Your power steering pump can get up to 1000 psi. I do not believe that a rubber o-ring will hold up ,but a good quality thread sealant like harvey's tfe paste with teflon should be a good substitute . This is used on high pressure steam lines in industrial settings with good results. Your local home center or plumbing supply should stock it . I use it on all my plumbing applications instead of teflon tape.
 
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