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Thread: Symptoms of fuel pump O-ring problem? Reply to Thread
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  Topic Review (Newest First)
08-02-2016 10:56 PM
spoonfork For the record, I've had the the "O-Ring" issue on my 2000 outback 4 Cyclinder engine.

See my post.
http://www.subaruoutback.org/forums/...0-outback.html
07-27-2016 01:42 PM
Sherpaman thank you very much kind sir
07-27-2016 01:40 PM
Sherpaman thank you very much kind sir.
07-27-2016 12:56 PM
1 Lucky Texan way back when I was investigating this - I actually traded an 'english' measurement with someone who had metric 928's - we decided the metric was a better fit so - I can't 'honestly' say anyone 'knows' what the stock OEM o-ring is.

but you can buy them in packs of 10 from Amazon and probably other places like; zoro, msc, grainger etc.


https://www.amazon.com/Sur-Seal-OR75...ton+75D+o-ring


maybe contact this guy (I have no connection with him, just found it with a general search); http://www.subaruoutback.org/forums/...available.html
07-27-2016 12:16 PM
Sherpaman If someone can tell me exactly where to get the o-ring it would help me a great deal, I have looked on line with every number in this thread, called my subi dealer, NAPA.


where are you getting this #928 viton o-ring ?




thanks
07-21-2016 02:45 PM
Sherpaman Could someone post a link to the correct o-ring, I can not get a final answer that i feel good about ordering.




thanks so much


Sherpaman
05-01-2016 04:33 PM
johnny_k All is well with our Subaru, much thanks to you guys. Time to report back my findings and results, as a thank you and in case any other run into similar problems and dig up this thread.

Quote:
Originally Posted by 1 Lucky Texan View Post
yeah - might have wrinkled/doubled back on itself

um - did you SEE any problems with the original? cracked tabs or displaced/ruptured o-ring sticking out?
Bingo, that was the problem. And yes, maybe I forgot to mention, but the original had the typical popped/displaced o-ring and ruptured tab when I first removed the assembly.

Sure enough, I pulled the assembly (a third time!) and opened the cap, and the o-ring and slipped out of place because of how I had put it on. I placed it around the cup instead like is done in the video, put it all back together and that solved it - it started right up on the first try.

What surprised me the most is that the fellow who posted the video to youtube said that he had ran his car without an o-ring for a week and it worked fine, just needed a couple tries starting every time. I was surprised that just with a little kink in the o-ring ours would not start at all, but then again he had put in a brand new pump, where we were using two older pumps (the one we originally had on, with 150k on it, and the one from the junkyard with 100k on it).

The OB is back up and running very well, probably from the combo of the new fuel pump o-ring & cap, and a clean IAC valve and IAC body. The clean throttle body looks nice, but it's so big that I don't think cleaning a tiny bit of carbon off that really makes a big difference on performance. Thanks again all!
04-23-2016 05:12 PM
1 Lucky Texan yeah - might have wrinkled/doubled back on itself

um - did you SEE any problems with the original? cracked tabs or displaced/ruptured o-ring sticking out?
04-23-2016 02:07 PM
johnny_k
Quote:
Originally Posted by johnny_k View Post
That's what I thought - but it was still pumping. I disconnected the quick connect at the top of the fuel pump assembly and had a friend turn the key, got a squirt of fuel. Is it enough... I don't know. But seems like the reasonable amount for the ~2 seconds that it comes on when you turn the key on but don't start the car.

I switched out the pump anyways with the one I got from the junk yard (I know, a little risky). Still nothing!!

As far as the fuel pump the same thing is happening, I hear it getting power and coming on for the couple seconds, and I hear it running when we are trying to start the car. But pull the line coming into the fuel filter and try to to turn the key to 'on' repeatedly and no fuel comes out.

Could it be the relay? It sounds like the pump itself is working - if the relay was the culprit would the pump get any power at all.

I've replaced the cap and o-ring, but didn't take time to check over the rest of the plastic assembly to make sure nothing else is cracked that would cause the pump to lose pressure. Also, when replacing the pump I put the old filter back on the pump - it looked fine but I didn't try to blow through it to check the restriction.
Ok, I just re-watched the good video of this: https://www.youtube.com/watch?v=oXH1A9sHt6M

I noticed that he put the o-ring on the plastic piece itself, where as when I was doing it, it seemed like that would not work well to get the cap back on after, so I put it in the metal cap and threaded the cap with o-ring onto the plastic. Maybe I did this in the wrong order and it popped out of place.

Still, it seems like I should be getting some fuel pressure, at least a little lower, but not NONE. I'm just so hesitant to go and pull the fuel pump assembly a THIRD time and get nowhere...
04-23-2016 01:40 PM
johnny_k
Quote:
Originally Posted by 1 Lucky Texan View Post
weird - I guess a shaft or impeller is broken?
That's what I thought - but it was still pumping. I disconnected the quick connect at the top of the fuel pump assembly and had a friend turn the key, got a squirt of fuel. Is it enough... I don't know. But seems like the reasonable amount for the ~2 seconds that it comes on when you turn the key on but don't start the car.

I switched out the pump anyways with the one I got from the junk yard (I know, a little risky). Still nothing!!

As far as the fuel pump the same thing is happening, I hear it getting power and coming on for the couple seconds, and I hear it running when we are trying to start the car. But pull the line coming into the fuel filter and try to to turn the key to 'on' repeatedly and no fuel comes out.

Could it be the relay? It sounds like the pump itself is working - if the relay was the culprit would the pump get any power at all.

I've replaced the cap and o-ring, but didn't take time to check over the rest of the plastic assembly to make sure nothing else is cracked that would cause the pump to lose pressure. Also, when replacing the pump I put the old filter back on the pump - it looked fine but I didn't try to blow through it to check the restriction.
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