# fuel cap wont sit flush with my fuel tank

**URL:** https://forum.motoguzziclub.co.uk/t/fuel-cap-wont-sit-flush-with-my-fuel-tank/24709
**Category:** Big Block Tonti and Loop Frame models
**Created:** [13 September 2026 19:30 UTC](https://forum.motoguzziclub.co.uk/t/fuel-cap-wont-sit-flush-with-my-fuel-tank/24709 "2026-09-13T19:30:14Z")
**Posts on this page:** 8
**Page:** 1

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### Author: ![aklfchs](https://forum.motoguzziclub.co.uk/letter_avatar_proxy/v4/letter/a/8baadc/32.png) [@aklfchs](https://forum.motoguzziclub.co.uk/u/aklfchs)
#### Post date: [13 September 2026 19:30 UTC](https://forum.motoguzziclub.co.uk/t/fuel-cap-wont-sit-flush-with-my-fuel-tank/24709/1 "2026-09-13T19:30:14Z")

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any ideas for my california stone

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### Author: ![mM480](https://forum.motoguzziclub.co.uk/user_avatar/forum.motoguzziclub.co.uk/mm480/32/7672_2.png) [@mM480](https://forum.motoguzziclub.co.uk/u/mM480)
#### Post date: [14 September 2026 06:34 UTC](https://forum.motoguzziclub.co.uk/t/fuel-cap-wont-sit-flush-with-my-fuel-tank/24709/2 "2026-09-14T06:34:53Z")

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Is it rattling or not straight?

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### Author: ![aklfchs](https://forum.motoguzziclub.co.uk/letter_avatar_proxy/v4/letter/a/8baadc/32.png) [@aklfchs](https://forum.motoguzziclub.co.uk/u/aklfchs)
#### Post date: [14 September 2026 07:59 UTC](https://forum.motoguzziclub.co.uk/t/fuel-cap-wont-sit-flush-with-my-fuel-tank/24709/3 "2026-09-14T07:59:35Z")

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Just not stiing flush with the tank

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### Author: ![Mr\_P](https://forum.motoguzziclub.co.uk/user_avatar/forum.motoguzziclub.co.uk/mr_p/32/2103_2.png) [@Mr\_P](https://forum.motoguzziclub.co.uk/u/Mr_P)
#### Post date: [14 September 2026 09:48 UTC](https://forum.motoguzziclub.co.uk/t/fuel-cap-wont-sit-flush-with-my-fuel-tank/24709/4 "2026-09-14T09:48:43Z")

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A picture may help

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### Author: ![richardEV10](https://forum.motoguzziclub.co.uk/user_avatar/forum.motoguzziclub.co.uk/richardev10/32/2460_2.png) [@richardEV10](https://forum.motoguzziclub.co.uk/u/richardEV10)
#### Post date: [15 September 2026 19:43 UTC](https://forum.motoguzziclub.co.uk/t/fuel-cap-wont-sit-flush-with-my-fuel-tank/24709/5 "2026-09-15T19:43:06Z")

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> [@aklfchs](#):
>
> california stone

Is this the filler cap.

 ![California fuel cap](https://forum.motoguzziclub.co.uk/uploads/default/original/2X/c/c449e41d6100f06b0804230cd72cdd8bc4312e3a.jpeg)

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<div class="post-metadata">

### Author: ![aklfchs](https://forum.motoguzziclub.co.uk/letter_avatar_proxy/v4/letter/a/8baadc/32.png) [@aklfchs](https://forum.motoguzziclub.co.uk/u/aklfchs)
#### Post date: [15 September 2026 20:38 UTC](https://forum.motoguzziclub.co.uk/t/fuel-cap-wont-sit-flush-with-my-fuel-tank/24709/6 "2026-09-15T20:38:57Z")

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Yes this is the cap

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### Author: ![richardEV10](https://forum.motoguzziclub.co.uk/user_avatar/forum.motoguzziclub.co.uk/richardev10/32/2460_2.png) [@richardEV10](https://forum.motoguzziclub.co.uk/u/richardEV10)
#### Post date: [16 September 2026 15:18 UTC](https://forum.motoguzziclub.co.uk/t/fuel-cap-wont-sit-flush-with-my-fuel-tank/24709/7 "2026-09-16T15:18:48Z")

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Is the large O ring sitting in the cap level and are all the splines on the filler cap all there and level and not bent. The filler neck opening (has guides) looking down at it are they all level and not bent upwards. Here is my filler cap which is the same as yours.

 ![001](https://forum.motoguzziclub.co.uk/uploads/default/original/2X/c/c3725be8e7be5ac0cd582bacf97479cddf34d5ba.jpeg)  
 ![002](https://forum.motoguzziclub.co.uk/uploads/default/original/2X/9/945499d59f5146f648c37ab5d0e355eed316d25e.jpeg)  
 ![003](https://forum.motoguzziclub.co.uk/uploads/default/original/2X/1/14dce37646fc210f28d37bb5e6b9a41fa3d40555.jpeg)  
 ![004](https://forum.motoguzziclub.co.uk/uploads/default/original/2X/c/c762a64cb74dae24630b63faf0228020700f8879.jpeg)

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<div class="post-metadata">

### Author: ![Mr\_P](https://forum.motoguzziclub.co.uk/user_avatar/forum.motoguzziclub.co.uk/mr_p/32/2103_2.png) [@Mr\_P](https://forum.motoguzziclub.co.uk/u/Mr_P)
#### Post date: [16 September 2026 22:08 UTC](https://forum.motoguzziclub.co.uk/t/fuel-cap-wont-sit-flush-with-my-fuel-tank/24709/8 "2026-09-16T22:08:00Z")

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Has the seal swelled. Can happen because of ethanol in the petrol. I had something similar happen on a 2000 BMW.