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My 1993 mack rd688 with the E7 400 will not start...can run it on starting fluid but will not run with out starting fluid so no fuel problem ...started by changing all the fuel filters and no start so I checked for voltage at the fuel shut down solenoid and nothing ...checked the shut down relay and it seems to be working and swapped it out with other relays that I know work and still no voltage at shut down solenoid ...the relay clicks when I turn key on or plug it in like  all my other relays ...my question is there something else that will cause a fuel solenoid shut down ..like maybe ECU or a sensor somewhere?

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