[orthodoct]

Hi Karlaw. Fuel regulator is at back of plenum, has a round black top with a vacuum connection. Fuel lines run into it. It has a sensing diaphragm in it. If the diaphragm is ruptured, it will allow raw gas into the plenum and can't regulate fuel pressure. Best way to check is to see if the hose connected to it has liquid gas in it. It should not. If engine is running and you remove hose and diaphragm is defective, will spray gas so be careful. Gurus, let me know if I am in error.