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Old 06-16-2002, 09:14 PM
400E 400E is offline
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Join Date: Jun 2001
Location: Omaha, NE
Posts: 962
The fuel pressure regulator on the M119 engine, at least, is not adjustable. It is a cylindrical brass doodad, about 1.25 inches in diameter with a vacuum hose coming off the top of it, and sits at the rear of the engine on the driver's side. They do go bad at times and cause rough idle conditions, and probably other symptoms.

Don't know if this applies at all to the 300E.
'93 400E
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