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https://www.summitracing.com/parts/rnb-80195 https://www.summitracing.com/parts/sum-220019

It's no big deal to vent your tank and get rid of fuel vapor odors. You're not tied to locating parts that are more than 50 years old and sometimes non-existant. In your case, I suspect a plugged vent hose. This pic is on a custom build that utilizes a Corvette brake booster charcoal filter...

"The pump should stay cool if you run a fuel return, dead-heading it will heat it up" Not true. The pump only runs when there's a demand for fuel, and the carb uses it as it's delivered. What burns up an electric pump is installing it as a "puller" instead of a "pusher". Mount the electric below...

A study was conducted by a utility company I worked for in the late '80s on the quality of motor fuels from various suppliers. There were 100's of vehicles in this companies fleet. A pattern emerged as to fuel cost and fuel related engine failures, and maintenance problems. Bare in mind that...

The springs that 70Fish suggest are supposed to fit one inside the other with their end attaching points being the same. With what your pic shows, you have spring tensions of different rates pulling at at different angles. The spring in a spring is a safety feature. Should one of those springs...

That formula equates a carb with 100% EV and as stated, just gives a starting point. Altitude, humidity, ambient temps all play a roll. What works at sea level, is going to choke and puke at 5000 ft. It wouldn't surprise me that the OP''S configuration is nearing 90% + VE given the optimal...

The equation is just for ballpark (a starting point). Many things affect a carbs performance on a given engine. But you knew that, of course. I wouldn't rely on that formula hoping everything will perform to it's optimal.

Eng CI's x Max RPM ÷ 3456 = Carb CFM should get you in the ballpark. Example: 446 x 5600 ÷ 3456 = 722.685 (round up to 750 cfm)

https://www.holley.com/blog/post/how_to_identify_your_holley_or_demon_carburetor/

Check the gasket from the sending unit/fuel pump flange to tank. Had a leak there before. Most noticeable during hard acceleration/deceleration.

An easy way to check for integrity of the needles and seats: Remove the carb and drain any fuel in the bowls. Attach a vacuum pump and hose to the fuel inlet, invert the carb and press the vacuum pumps' handle a couple times to see if the vacuum holds. If no vacuum there is definitely a problem...

Yes, I hit the big red X. I hate them as to the degree of disagreement. As long as the engine is allowed to reach 'normal' operating temps, even when stationary, it will burn off any contaminants present. There are literally 1000's of 440's in the field performing pump duties. They're not any...

Did the same as TN Mopar. Used a roll over check valve, bug screen, charcoal master cylinder booster line filter, sealed cap. Inexpensive and easy. No fumes in the garage.

I'm running 5/16 steel to 3/8 rubber and not a single problem. I would check all clamping connections, tank vent, and pick-up screen in the tank, or your gas cap. Your system is creating a vacuum somewhere and is sucking in air. The size of the lines has little effect on fuel delivery at most...

You don't need much to vent a tank. I use a power brake booster vacuum line charcoal filter and a marine/boat bug screen. Simple and cheap. No gas fumes in the garage. (The black filter/short hose section/billet bug screen). The bug screen has a check valve to prevent fuel flow if you're upside...

True on the variables. Altitude, air density, humidity, temperature, all have an effect. The overall tuning relies on where the PowerPlant will spend the majority of It's useful life. The applied formula does give a reasonable starting point.

Late again to the party, but there is a mathematical formula for determining required cfm. The formula for calculating how much CFM (cubic feet per minute) an engine requires is: CFM = Cubic Inches x RPM x Volumetric Efficiency ÷ 3456. Any ordinary stock engine will have a volumetric...

The Quick Fuel Slayer Series is a little easier to tune. 4 corner metering jets and secondaries adjusted with one screw. I run one on a 440 and it works well.