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Doug, ASE Certified Technician
Category: Mitsubishi
Satisfied Customers: 8606
Experience:  Mitsubishi employed and Factory trained ASE certified technician
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I have a 2001 Eclipse with a 3.0L automatic. Just replaced

Customer Question

I have a 2001 Eclipse with a 3.0L automatic. Just replaced fuel pump and strainer and it will not start. Do not hear fuel pump when key is turned to on position. I need the location of all fuel pump relays and fuses.
Submitted: 1 year ago.
Category: Mitsubishi
Expert:  Doug replied 1 year ago.


The fuel pump does not run when the key is turned to On, that is normal. It only runs when the engine is rotating.
Was the vehicle running prior to the fuel pump replacement?

Customer: replied 1 year ago.
No tested...bad fuel pump. Replaced, generally when you turn key to on position you can hear fuel pump engage. Not doing anything.
Customer: replied 1 year ago.
Not fully turning engine over, just listening for fuel pump to power up.
Expert:  Doug replied 1 year ago.

Yeah this car won't prime at key on like some cars do.
Unplug the fuel pump connector and connect a meter between the two larger diameter wire pins and then turn the engine to crank. Do you see voltage when the engine is cranking?

Customer: replied 1 year ago.
have a 2001 eclipse cranks wont start .i can spray throttle body and runs replaced fuel pump..large green wire powers up when cranking
Customer: replied 1 year ago.
Expert:  Doug replied 1 year ago.

Thanks. If the pump is getting power when cranking, then there is nothing to concern yourself over regarding the fuses or the relay etc.
What you need to do is check to see if you have fuel pressure at the rail while cranking (~50 psi). If you do not, then there is likely something wrong with the pump installation.... either the pump is defective, wired backward, missing an o-ring etc, or the module connector was bad not the pump motor (more often the connector on the top of the module fails, not the actual motor).
If you do have pressure at the rail while cranking, and it runs on starting fluid, then this would indicate your injectors are not operating most likely (again if you have good pressure, not just a trickle flow like a faucet). This vehicle uses an immobilizer system that disables the fuel injectors if there is a problem with the key, so at that point you would want to try a second key in case one died etc.

Expert:  Doug replied 1 year ago.

Well, what did you find with regard to the pressure at the rail (psi) and the injector operation?