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1996 Range Rover P38A
146 Posts
Discussion Starter #61
I've been all over this diaphragm with a lens. There is no physical damage to it whatsoever, no tears, no cuts or scuffs.

Given that the diaphragm is blackened on both sides I can only conclude that the diaphragm has become permeable.

I've seen countless videos of fuel pouring out of the vacuum side, so they must all fail in this manner given enough time.
This is pertinent because all P38's are long in the tooth now, and these FPR's can do a lot of damage.
Bear in mind that fuel can take several minutes to show if you suspect there's an issue, but if you can see or smell traces of fuel, it's time for change.
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