Yes, there are two filters in the pictures.

Clamps are not needed. Buy tubing that fits and clamps are a waste of time. The excellent quality silicone tubing that's available everywhere absolutely does not need clamping. It's so easy to find tubing that fits the filters that're available, and filters that fit the tubing that's available, that it's really funny to experienced modelers to hear that clamps are needed and that more connections are more risk. OK, it's not funny anymore, it's actually sad. Truth is, if a modeler hasn't been able to work out sticking a hose on a fitting, he probably ought to find another hobby. (OK KIDDIES !! IT'S FLAME TIME.....)

There is a filter on the muffler pressure line. It's there mostly to provide a secure and available disconnect point. I would not have bothered except this line is "above". When I use simple two line plumbing, the line that provides muffler pressure goes to the overflow pipe in the tank. When the layout of the pressure tap in the muffler and the location of the muffler is "below" and the overflow easily drips out the muffler pipe, you don't need to do anything special to the line. Also, if the line is very transparent and your fuel is dark enough, you don't need to squirt the overflow to know when the tank has reached overflow. Well..... I also wanted to see how much crap a muffler blows down the pressure line. And I wanted to see if a filter in that line would affect the engine. And the line wasn't easy to see the fuel flow. So..... I stuck that filter in that line.

And yes, there is a filter in the delivery line.

The LHS said something they believe in. There is much more to the story than that. Experience will show you what you wish to do with filters. It should also teach you how to stick a tube on a fitting. And teach you what tubing fits what fittings.

That airplane has flown around 5 to 25 flights a week since last year with the plumbing you see in the picture. It's worked perfectly from day one and is still working perfectly. I've cleaned the pressure line filter every time I've had it open. I've yet to have to clean the delivery line filter. Not once has any connection come loose. Connections that are not disconnected regularly tend to seal themselves. Working connections will tell you when the tubing is relaxing. I've yet to see any of the modern tubing do that in the last 20 years.

Use quality tubing that fits and the extremely slight risk will not warrant using clamps. If you think clamps are needed, use 'em. But don't use the ones that might cut through the tubing and cause problems.