'92 Loyale - Difficult to start, rough idle, and stalling/no power while in gear.

[SuspiciousPizza]

For SPFI models, the fuel pressure discharge from the fuel pump is 36-50 psi. After the regulator is 20-24 psi @ 700rpm. The regulator drops the high pressure from the pump to a usable pressure for the injector. So there is a high pressure side and a low pressure side, separated by the fuel pressure regulator on the throttle body.

Could be an issue with the fuel lines or filters. But most likely the fuel pump is tired and out of spec.

[cherrythesubaru]

Well wish I had done this check sooner! I'll see if I can find a pump and swap it out. 

Thanks! 

[cherrythesubaru]

Searching around for a pump that will work. My local parts store carries this pump: 

https://www.rockauto.com/en/moreinfo.php?pk=1111648

Thoughts on this being a viable replacement? 

[el_freddo]

I don’t know the SPFI well at all, are you sure the fuel pressure spec is 21psi? I thought it would be more inline with other EFIs like the EJs up at about 40psi. 

I’ve used the same external fuel pump for a NA MPFI EA82 and an EJ22. No issues. 

My thinking is that your fuel pressure is half of what it should be. This could be the fuel regulator or the fuel pump itself, or both. 

Pull the vac line for the fuel pressure regulator and make sure it doesn’t smell of fuel. If so, it’s dead. 

Cheers 

Bennie