I'm here from the future because I have the same question. I have a 1993 Subaru Impreza with the EJ18 engine. One of the fittings broke off of this part several years ago. I tried to find a replacement then but couldn't so I epoxied the fitting back on. Well it broke off again today.
I think it might be the Evap purge solenoid but the one on my car is adjustable with an allen key and I can't find any part that looks like it. Also, I have no idea why it would be adjustable or how specifically it is supposed to be adjusted correctly.
https://parts.subaru.com/a/Subaru_1993_Impreza-18L-MT-4WD-L-Wagon/_54102_6025398/FUEL-PIPE-SUPPLY/G10-061-01.html
https://parts.subaru.com/p/Subaru_1993_Impreza-18L-MT-4WD-L-Wagon/Valve-Solenoid--43-2WD-C0-U0--4WD-NO1/49227159/14774AA271.html
Can anyone confirm what this is?
