Holley fuel pressure regulator identification

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Holley fuel pressure regulator identification #2591962 12/14/18 05:55 PM 12/14/18 05:55 PM
Joined: Jun 2003 Posts: 72 H Hangtowner OP member
Hangtowner OP member H Joined: Jun 2003 Posts: 72	I have a blue Holley fuel pressure regulator with numbers 34R-6657B on it. Since a bypass regulator has the same number and size ports as a non bypass regulator, how can I tell which one this is? The Holley web site doesn't have this number.

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