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Thread: Symptoms of fuel pump O-ring problem? Reply to Thread
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Topic Review (Newest First)
09-20-2014 08:43 PM
03LLBean Thanks. I think I'll buy the cap before I go into it.
09-20-2014 04:19 PM
1 Lucky Texan not a failed/protruding o-ring, just soft-ish and enlarged.

I have always run premium and our fuel is mandated for 10% ethanol due to several counties around here being "non-attainment" rated.

I do occasionally use fuel additives. usually every coupla years - either Techron or SeaFoam. also, her car is low miles plus, is never driven off-road.
09-20-2014 11:02 AM
eagleeye
Quote:
Originally Posted by 1 Lucky Texan View Post
depends - if you can either wait until you can source parts, or if you can comfortably re-install the broken cap (if that's what you find.....) and risk driving the car for a few days and then pull the pump again.

I elected to have new o-ring and cap on-hand. My original cap looked fine, but the o-ring was 'swollen' so, I replaced both . I looked at it like a one time preventive maintenance thing. $70 and 90 minutes or whatever - cheap peace-of-mind.
Swollen,...1LT please remind us what octane your bean runs on. (and if you think such gas has ethanol in it).
09-20-2014 12:52 AM
1 Lucky Texan depends - if you can either wait until you can source parts, or if you can comfortably re-install the broken cap (if that's what you find.....) and risk driving the car for a few days and then pull the pump again.

I elected to have new o-ring and cap on-hand. My original cap looked fine, but the o-ring was 'swollen' so, I replaced both . I looked at it like a one time preventive maintenance thing. $70 and 90 minutes or whatever - cheap peace-of-mind.
09-19-2014 05:18 PM
03LLBean I am planning to replace the o ring soon as preventative maintenance. Should I have an extra cap on hand in case the original cap is cracked or cracks during disassembly? There are no symptoms of the problem that I am aware of.
09-10-2014 05:55 PM
CNY_Dave I am hoping 93 octane around here has a bit less ethanol. I know the fuel can have as much as 10% here, but either it is a good bit less or when I was in CT and they claimed 10% it was more like 15 or 20%.
09-10-2014 03:41 PM
Flat4 Ethanol is the likey culprit. Viton is resistant to it. I am wondering if the worldwide market drives the OE mat'l choice, assuming that only the US mandates 10% ethanol. If the OE ring is nitrile it answers all the questions on this subject. I'm over 150K and 12 years on my my original pump. This thread is very helpful amd much appreciated. I'll pick up a Viton ring in short order and maybe do some PM.
09-10-2014 08:22 AM
CNY_Dave The original part swells, so viton seems a better choice.
09-10-2014 01:28 AM
marmar1305 Why using a metric 928 viton (brown) o-ring instead of a original Subaru o-ring Part# 42072AE00A

08-21-2014 01:51 PM
leakyheadgasket 2000 Legacy here, just got through dealing with the same issue. My mechanic tried to tig-weld the cap but it only lasted a week at best, so I had to replace it with the NPN kit that everyone here is referencing.

One thing: I decided to go with a 90A durometer o-ring (from Amazon... I have 9 left, sigh), which is quite hard. I figured if the problem is the o-ring blowing out, then the harder one will be better. When I got the assembly off it definitely seemed like the original part was a softer o-ring, of the typical 75A durometer rating. But the new cap went on (after a bit of an argument) with the harder o-ring just fine, and the car is working fine now.
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