I have a 1987 Subaru XT GL-10 Turbo that was sitting garaged for 7 years. The fuel pump had failed and the gas was so bad in the tank it wouldn't flow from the hose at the tank. The fuel pump is replaced and the the tank is flowing again but the fuel pump will start making a terribly loud noise after a few minutes of operation and the pressurized line line vibrates real bad. The pump flows fine and there is no noise when I run a hose off of it and jump it from the battery. This is the second fuel pump this month since I though I got a bad one after the first one made so much noise.
The return line is not clogged, I blew air through it with a pump.
There is a lot of fuel pressure but not sure how much. I pulled the line off under the hood and it did spray hard for about 5 seconds.
I thought it could be the pressure regulator but that would mean it would be running very rich with the extra fuel pressure and there is no black smoke like its running rich. Actually the car will choke or stumble real hard under boost like its not getting fuel but idles fine and runs well under no boost conditions.
The codes stored were 44 (boost selinoid),
Code 22 (Water temp. sensor) Replaced but still showing up
Code 41 (Knock sensor), I can't even find this sensor.
Anyone every had a similar problem or have any ideas.
Thanks in advance,
Dan