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Originally Posted by
Terry@BMS
It appears based on this diagram that when this fuel mass valve (4) opens high pressure is able to push the plunger up allowing high pressure to bleed off back to the vacuum side of the high pressure pump (to position 2). What stops this pressure from pushing all the way back to the in tank pump?
What's this little piece of trash labeled #8 (Supply passage,
pressure limiting device)? That sounds like the fun police to me... "
