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take off the fuel return line off the FPR, put your eyes near the outlet. Have a friend crank it over. If you feel a nice stinging sensation, you are getting fuel. If you dont, You have a fuel pump problem. Could be main relay, could be wire fell out of the connector in the housing. Take a test light and poke around. Dead CAS will make the Injectors not fire. Its uncommon for injectors to fail, especially all 4 at the same time, so you wasted your time and money replacing the injectors. Take a test light and poke at the connectors for each injector, with the key on, they should all have 12V constant. The other connector gets grounded by the ecu.
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