A command from the ECU to the Pulse Module closes a relay in the pulse module that powers the pump.

The relay or fuse could be bad, but there are a number of things that would cause the ECM to not command the pump to run. I"ve not owned an SRT, so I cant speak to anything past the wiring.

It is time for you to grab a voltmeter and the service manual and determine if the cause is the ECM not sending the enable to the pulse module, or if it is the pulse module.

The manual is downloadable free from our tech section.