Is there an adapter to fill these with a 1lb tank?

Yes, you still use the adapter for 20 lb tanks and add a 20lb to 1lb adapter. This is readily available at your hardware store and it's purpose is to allow you to hook up a 1lb propane bottle to your BBQ for when the 20lb runs out in the middle of a cookout. Sometimes called a "Steak Saver" HTH

Is tank suppose to leak gas after the bleeder valve is closed after filling?

No it should not leak after filling. But the smell of propane is strong give it a minute after filling to air out.

Why is it called a 1/4lb tank? It weighs half a pound empty and only holds about 1.5oz of propane.

It hold 50 grams of propane. I have filled two of these containers multiple times and 50 g is how much propane can be held. I have a YouTube viewer that independently verified the weight. The claimed 3.85 ounces is approximately 100 g which is double the actual capacity. Maybe the flame king company and explain. For fun I filled up one of these tanks with butane, and I weighed the fuel as 65 g.

Brand	Flame King
Material	Alloy Steel
Bottle Type	Refillable, Pre-Purged, Vacuum Ready
Color	Green
Capacity	3.85 ounces
Special Feature	Patented Valve, Refillable, Fast & Safe Refilling
Product Dimensions	2"W x 5.13"H
Product Care Instructions	Hand Wash Only
Model Name	FK3.85LP - 1/4-LB Refillable Propane Cylinder
Recommended Uses For Product	cooking torches, small propane lamps and lanterns, welding torches
Number of Items	1
Reusability	Reusable
Shape	Rectangular
Style	1/4LB Tank (1-PK)
Finish Type	Powder Coated
Unit Count	1.0 Count
Package Information	Tank
Number of Packs	1
Manufacturer	Flame King
UPC	850034692111
Part Number	FK3.85LP
Item Weight	8.8 ounces
Item model number	FK3.85LP
Size	3.9 Ounces
Finish	Powder Coated
Item Package Quantity	1
Special Features	Patented Valve, Refillable, Fast & Safe Refilling
Included Components	3.85 Oz Empty Fuel Tank
Batteries Required?	No

1/4LB Propane Cylinder

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