I took one of my Facet fuel pumps apart this evening. One of the square solid state types.

Sunday nigth when I wanted to go fly one of the pumps didn't when I turned on the power. After fiddeling a bit with it it started up. I'd also noticed occasional fuel pressure drops (very brief).
This lead me to believe that the pump was intermittently bad.

I'm very impressed with the construction of these pumps. All of the electronics are embedded completely in foam.
It's hard to see how one of these pumps could fail electrically. I suppose that heat cycling could lead to a bad connection on the circuit board even though all components are held firmly in place by the foam.

Of course it's impossible to inspect the electronics because of the foam.

Anybody here know of a solvent that will dissolve the foam and not harm the electronic components and circuit board?

Finn