2G No power to fuel pump

[Layne97gst]

I have a 1997 mitsubishi eclipse gst 2 liter turbo that's a manual, that I just put a new alternator on,it has crank and air but no power to fuel pump but all fuses are good and lighting up so what could it be

 

[JPenny]

Hey how are you checking power to the fuel pump? I might be wrong, but I think on these cars the pump only activates while engine is cranking. It does not "prime" with just ignition switch on like other vehicles. Thank you for your time, Jason Penny

 

[chrysler kid]

Correct.

On a 2g turbo the black 2 pin connector behind the throttle body on the fire wall can be jumped with a paper clip to provide 12v to fuel pump to prime the pump without the key cranking

 

[steve]

The ECU controls the fuel pump. When it wants the pump on it pulls the signal line from the fuel pump relay to ground. That causes the relay to switch on and power the pump.

I've seen people blow the transistor on the ECU that switches the signal by jumpering the wrong pins on the relay or ECU with 12v. Normally the resistance of the relay coil protects the transistor.

Get out the multimeter and start checking the circuit. It will be clear in short order where it's failing.