Just to inform you, maybe it's not the product's fault.... I had used another cleaner from a well-known company and I experienced the same issue... it couldn't "hold" it all.... with a screwdriver, I pressed the valve on the gas cap, it made a pop and released the gas that was in the valve, and everything was fine, it all fit without effort....

It doesn't fit at all. In an empty tank, it took half. Not to mention it was leaking from the plastic. Now, whether it works is unknown

I had a problem with the LPG system. It would start and have irregularities, stalling and idling. With an empty!! (it matters) tank, I put it in the reservoir with the hose and filled it with Shell LPG. That’s it. Of course, I had changed the filters, but the problem was not solved. However, be careful, it requires PATIENCE to empty the entire cylinder and a strong shake. Put in half, shake very vigorously, and then the rest!

Disgrace for a renowned product like this, with a final empty tank I was trying for about three minutes but in the end it only managed to take half, the container does not have enough pressure to release the liquid.

The pressure of the container is not enough in any case to send all the product to an empty tank. I managed to put half of it at best after 5 minutes of pressure. Disgraceful.