No way the shop should pay the gas. You didn't test it and it is part of the
pre-takeoff checklist.

Karl
Had a major radio install on my Baron- a Garmin 530W and 430W. As part of
the install the avionics shop moved the radar display.

On the trip home (the same trip where in IMC the alternator quit) I
turned
the radar on, since there were some storms over my home airport as
indicated
by the nexrad.

Of course, the radar unit was completely dead. When I called the shop,
they
said that they moved the unit, but that no one had checked its operation.

Now, I have to fly an hour each way to the avionics shop to fix the
problem.

Who should pay for the gas? I realistically don't expect them to pay for
two
hours of Baron flying time (which would probably negate any profit they
made
on the installation).

However, is it unreasonable to expect them to pay for some of the gas?