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Old 11-27-2023, 03:00 PM   #1
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Join Date: Sep 2022
Location: Seattle area
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Replaced fuel filler valve, what next?

Hello all, I noticed for the last few months that my car was becoming reluctant to fill the tank, seemed like I was getting to 3/4 on the gauge at best. Some searching here led me to think the fuel filler valve was the most likely cause, and I replaced it a few days ago.

Got the car up to a bit over 7/8ths on the gauge the next fill up, but that was topping off enough to spill a bit. I don't generally do the topping off bit, not sure how bad it actually is for the charcoal canister but definitely don't like the spills. Unfortunately this means I'm not actually sure if it was a bad valve or just a bad seal on the fuel nozzle, but it doesn't happen with the other cars I drive, and I figured it wasn't a bad choice to replace the valve.

Is there another part likely to cause incomplete filling? I don't know what to search for, all the terms and phrases I came up with just pointed back to the same valve. Kind of hoping it's not a replacement sending unit as the next step.

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Old 11-29-2023, 01:43 PM   #2
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Have you tried rotating the nozzle so itís pointing up when filling and also depressing the nozzle one notch to slow the amount of fuel going in?
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Old 11-29-2023, 04:38 PM   #3
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It could be any number of things. FWIW mine turned out to be the canister. My indy also initially thought it was the filler neck vent but once he had the car in the shop found out that wasn't it. You could try taking the canister out of the circuit and attempt to fill the tank. Be forewarned that fuel fumes normally burnt in the engine and the hazard they present will be there.
2001 Boxster, 5 spd, Seal Grey
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Old 11-29-2023, 07:58 PM   #4
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Thanks clickman, I'll let it be for a few tanks to get a feel for any changes and then might try that next.

RL911, yes I did, but I hadn't been doing that before, and it hadn't been having trouble filling, so something mechanical likely happened.

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