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383 cars never had a 1/4" return line but 440 cars had one that ran next to the 3/8" supply line all the way back to the tank.

I'd run a 3/8 just to be safe.

Probably wouldn't support 600HP.

I've ran my 440 with a Holley 750 WOT through all the gears and never ran out of fuel with a 5/16"

440HP and Hemi cars only got a 3/8" supply and a 1/4" return. All others just got a 5/16" supply and no return. 70 with N95 and all 71-up got a 5/16" vapor line.

https://521restorations.com/CR10A-71-72-B-Body-Fuel-Tank-with-four-side-vent-pipes-Zinc-plating/ Jeff at 521 has one.

440 cars used the 3/8" supply and 1/4" return lines. All others used a 5/16" supply with no return. That is all in the sending unit. The difference between early and later tanks are the 4 vapor vent lines. Early they are on the side of the tank and later are on the front of the tank.

I've always gone half of idle vacuum

I have several DP's with a secondary PV. That is interesting about how you rate a PV. Maybe that is what I doing wrong.

Ya double pumpers have a secondary PV and vacuum secondaries don't. Some delete the PV and bump up the jets. I've never done that myself. Funny that Holley doesn't recommend doing that but they make a PV plug.

Yes run a 4.5 in the secondary too.

Want to rebuild my leaking Carter mechanical small fuel pump. How do I know which one I have? It has number 62700K05A on it.

Never mind. Should have Googled it first. Quite a few of them out there.

Does anyone make a kit for the Carter mechanical fuel pump? Thanks

Don't see how any lube on the gasket would help anything nor as the gasket or unit plate move at all.

Or a good used original one. I toss the repros and keep the originals. Cranky I have some good used ones if you need one. Don't use any silicone as it is not gas tolerant. Also there was thick and thinner original rings.

The secondaries on the Edelbrock and Carter AFB carbs are to large for the WCFB flange.

Yep WCFB. The old Will Carter Four Barrel.

Crap KY Jelly would probably work.

Yep grommet goes into the tank first then use dish soap to install the tube.