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Thread: Symptoms of fuel pump O-ring problem? Reply to Thread
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  Topic Review (Newest First)
03-23-2017 12:06 AM
inthepink
Quote:
Originally Posted by 1 Lucky Texan View Post
see the dimple at the other end of that , 'claw'/tab w'ever? Don't twist the cap back on too far - it might put outward pressure on that part. I used a little motor oil on my o-ring and was careful to 'juuuussssttt' sneak up on that dimple.
I haven't removed the metal cap yet, but I should be able to test how the cap goes back on with both o-rings in the next few days.

The metric o-rings have arrived:





928 Viton on left, M2x54mm Viton on right:

03-22-2017 03:56 PM
1 Lucky Texan see the dimple at the other end of that , 'claw'/tab w'ever? Don't twist the cap back on too far - it might put outward pressure on that part. I used a little motor oil on my o-ring and was careful to 'juuuussssttt' sneak up on that dimple.
03-22-2017 02:00 PM
inthepink
Quote:
Originally Posted by 1 Lucky Texan View Post
you sure there isn't a crack forming at that ground lug?
Oops, you're right, there is. Looks like one of the other tabs has the start of one, too, now that it's out in the daylight. Stupid macro camera lens!

I plan to beef up all three tabs with a weld bead, then reinstall the new o-ring and fuel pump, so I should be good.
03-22-2017 01:35 PM
1 Lucky Texan you sure there isn't a crack forming at that ground lug?
03-22-2017 01:14 PM
inthepink
Quote:
Originally Posted by nepbug View Post
Well, my 01 is exhibiting these symptoms, so I pulled the pump to give it a check, and mine was fine, bummer, that would've been too easy.

I pulled the cap off to check the condition of the o-ring anyways, it was fine as well.
Same here. I figured $12 for some 928 Viton o-rings would be cheap insurance with 223K on the odo and an original fuel pump assembly...mine looks new.





I am planning to replace the fuel pump, but I see the Subaru part is discontinued, so armed with the factory part number (42022AE02A), I will shop around for a N.O.S. or good aftermarket pump.

If anyone needs a 928 Viton O-ring, PM me your address and I'll mail one out to you. I also have five metric o-rings on the way, so once I receive those and a new fuel pump, I'll update where necessary.

Here are the 928 Viton o-rings I purchased from Amazon, for reference:

01-14-2017 07:19 PM
nepbug Well, my 01 is exhibiting these symptoms, so I pulled the pump to give it a check, and mine was fine, bummer, that would've been too easy.

I pulled the cap off to check the condition of the o-ring anyways, it was fine as well.

I did want to pass on one tip for getting the cap back on. Petroleum jelly (vaseline).

I put a very thin coating of petroleum jelly on the O-ring (totally safe for your fuel system in case you're wondering, i always use it on fuel injector o-rings as well), put the o-ring back on the plastic part and then the cap slid on without much difficulty and without kinking itself. I also put a slight amount of PJ on the inner part of the cap to help it all slide together.
12-18-2016 01:45 PM
Boise Jim Just realized I might be able repair it with fiberglass resin after I searched online for repair ideas. Anyone see any problem with that? Really don't want to spend a few hundred for a new assembly.
12-18-2016 01:39 PM
Boise Jim Sonuvabitch! When pulling the hoses off my fuel pump assembly, one of the plastic nipples cracked.
Anyone out there have just the assembly part they would like to sell?
This is going to be one expensive screw up...

At least my o-ring was shot, so I need to replace that.
12-05-2016 01:30 PM
1 Lucky Texan I'd say likely unrelated.

most folks struggle with the P0420 code, can be as simple as an exhaust leak, bad wiring , bad rear sensor, etc. Can be complex A:F ratio problem.
12-05-2016 01:06 PM
Rico Rivaldi ahh my bad, it is code p0420
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