I feel like that pump is causing you trouble. I would rather use sandbags so I can turn it down lower. And no matter what I hook it up to I'll always have a ball valve in case, it's always good for safety too.
That's the best thing about bio gas really there is so many options available you know there's not just one way there's many ways to make it work for your Situation. I love the pump thu
The company I purchased it from shut down at the beginning of covid. Luckily I purchased 3 double burner stove and a single burner stove before they closed. I might consider selling 2 of them