5/16 fuel line restriction?

[Gunner1]

New problem. I just had a wide band O2 sensor and gage installed along with a vacuum gage. Car was sucking gas on the highway like a crew of sailors on liberty. Found out my neutral hot idle vacuum is 8 to 9 at 1000 rpm my in gear idle at 750 is only 3.5. I have a 4.5 power valve in it. O2 readings are 13.5 neutral and 10 in gear. Idle fuel line pressure is 6.5. In park at 3000 rpm pressure drops to 3 pounds and O2 reads 10 again new tank, new sending unit, new std vol pump, billet filter before carb. I know I need to pull the carb and filter apart and replace the power valve since it backfired and needs a lower number. Maybe a 2.5 or a 1.5. I’m thinking I might install a 3/8 line from the tank. It was a 318 car. My stock cast crank damper has rotated so I need a new one to properly set timing. Used a plug hole stop to verify. MSD no vacuum canister. Was set at 12 idle. 36 all in at 3000. Vacuums might come up with a proper timing setting. Anything I’ve missed?

 

[68-500]

Yes you need to get your timing at idle up. Minimum 20-25*. Ill bet you gain gobs of idle vacuum. It will probably fix your rich idle because the PL won’t be open at idle .

 

[BSB67]

Tell us about your cam.

 

[ckessel]

Maybe some of the hose is separating/collapsing which will cause restrictions. Also, every brass/steel fitting involved from tank to carb is a restriction. Look on the inside of them. They are not the diameter of the hose.