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Could a remedy just be keeping the gas cap loose? 

Edited to add: I'm using a non-Subaru gas cap which may be the issue. 

I tried loosening the cap, no difference.

Edited by ThosL
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I have a vehicle that for years would trip the overfill shutoff at the gas pump for unknown reasons. I found out that if I turn the filler handle upside down, I can pump at nearly full speed without tripping the shutoff. Not sure if that will work for you temporarily until you find out the issue.

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On 12/12/2023 at 8:39 AM, azdave said:

I have a vehicle that for years would trip the overfill shutoff at the gas pump for unknown reasons. I found out that if I turn the filler handle upside down, I can pump at nearly full speed without tripping the shutoff. Not sure if that will work for you temporarily until you find out the issue.

I used to see this trick done 40 years ago on problem fillers

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Have you checked the fuel vent pipe and hoses for kinks or dents. All this stuff is behind the passenger side wheel and metal shield.

Could be rock/ice  damage to fill neck vent tube. If the fuel tank can't vent it won't fill.

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