I have 2 buddy heaters that run good on the 1 pound tanks but when I hook them up on the 20 pound tank the Pilot light works good but when you turn it on low or high it goes out any suggestions will help .

You might need a low pressure regulator between the tank and heater. I need one to run my 30,000 btu blue flame off a thirty pound tank

I have a coleman grill that doesn't work on 20s. I tried everything I could and still no go. I bought an adapter to fill 1 lb cylinder off the 20 and remedy the problem that way. The 1# tanks are way to expensive for as much as I use it.

The buddy's require a filter if running the rubber hose off a 20 or larger.

How old of tank? Your best off exchanging tanks every time vs filling them. When you exchange them, you know you are getting a clean inspected tank.

Tried the filter and a new tank still won’t work right.

I had to pull the filter and no regulator to get mine to run off 20 lb tank. They have a built in reg and thatz all i use.

I just use the tank and hose, never had the filter. Mine works OK.

https://www.youtube.com/watch?v=SSga7E7RDmQ

You might want to watch this.

https://www.youtube.com/watch?v=QN4uB7_ED5E&feature=emb_rel_end

It costs me $8 to refill 20 lbs at the Amish shop. How much do you spend on an exchange?

Be aware , exchanging your tank usually gets you less. Most exchanges give you about a 3/4 fill or about 15lbs. I only use the exchanges when my tanks are about or out of date . This way you get a tank that is IN date for certification instead of buying a new tank.

Refilling , if you shop around for the lowest price is cheaper than an exchange.

It is always cheaper to get the refill. I just refilled a completely empty 40 pound tank for $19, where I would be charged $21 to exchange a 20 pound. As far as the inspection goes, they’re good for 19 years after date of manufacture and then you gotta get it inspected every 4. So much cheaper to refill.

13 to refill here
21+ to exchange

Problem though is someone has put a bur under some saddles about certification dates. Got 20lb tank I got on exchange last year with a 97 date on it. It'll get exchanged when emptied.
Got a 100lb that has an old date. No idea how or where to get it recertified or exchanged.

Most places that refill them can recertify. Any company that delivers bulk propane in the area certainly will. I think it cost me 5 bucks last time to have one done. They pretty much just make sure it doesn’t have any damage and the seal in the valve is still good and slap a sticker on it.