Originally Posted by maldog
I have a friend that's a mechanic and he said they use dilithium grease and that's what in also use. He also said that what ever somebody might use will be cleansed almost immediately after starting the engine because the fuel washes the o ring clean. I just pulled both my fuel rails last month. They slid right in with no tearing of the o rings and no leaks at all.
Lithium grease is another good choice as it is a "soap" based grease.
But I disagree that it will be cleaned off immediately.
The O-ring is behind the pintle cap which covers most of it and the fuel should be spraying away from it with air flow coming in behind it, so very little fuel can actually get to the O-ring.