after fitting a walbro 255lph pump to a my02 wrx, now when my fuel gauge reads a 1/4 of a tank or less my AFR is leaning off to 11/12:1 and are getting hesitation / missfire whilst when i had my OE pump fitted my AFR was reading 10:1 all the way to the fuel warning light came on with out any hesitation / missfire. any one else had similar experiences.

 

have you used the walbro or OE pump filter?

the OE one is better.

Simon

 

originally i fitted the walbro filter but now have removed the pump fitted the oe filter as its a lot bigger but still the fault persists