Well, I'd first check the current at the motor with a test light and just
make sure you don't have two unrelated motor failures.

But, if they have seperate fuses, do they share ANYTHING electrical in
common?  Perhaps a switch assembly or a single multipin connector somewhere?
--scott

I'm with Scott on this one. You have one of two possible problems, both
motors went at the same time or the switch has gone south.

The common point of power will be the feed into the switch. When the high
pressure motor is selected, there is power to that motor via the respective
fuse, and the same for the low pressure motor.

You can check for power to the fuse to see if the power is coming out of the
switch. If there is no power coming out at the fuse to the respective motor,
then the assumption becomes a failed switch or no power goint into it. If
there is power at the fuses, then the assumption becomes failed pump motors.

I accept the skepticism that two motors would go together, but you cannot
completely ignore the possibility.

Of course, you could haved a pack of rats (vermin) making snacks of your
wire harenss ...

If you can't hear the pumps, it'a likely an electtical problem.
Otherwise, look for a filter or an anti-return valve common to the two
sections.