What would happen with blocked fuel filter?

[Phizinza]

What would I experience if a filter or pipe was blocked with a OBD1 engine thus dropping the fuel pressure?

 

Any codes?

Just loss of power?

 

And can I get a fuel pressure gauge that can tell me if somethings wrong? How much are these normally?

 

Thanks

[porcupine73]

If the pressure is low enough, you might get some stuttering or stumbling, esp under heavy throttle. Did ODBI have misfire codes? If so you might get that.

 

When the vehicle is running in closed loop, the ECU will just hold the injectors open longer to get more fuel in there. To a point of course, because below a certain pressure it won't be able to get enough fuel through the nozzle in the available time.

 

You can probably borrow a fuel pressure gauge from autoparts place if you have something like that. Usually they have a schrader type valve to tie into the fuel rail, but Subaru's don't have those valves on the rails. So usually you would tee it in after the fuel filter. Then you can tape the gauge to the outside of the windshield so you can see it when you're driving. You can't (shouldn't) run the fuel line into the passenger compartment of course.

 

If the fuel return to tank line is plugged, then your fuel pressure may be too high.