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 Fuel Tank Slight Vacuum 
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Firing on two.

Joined: June 22nd, 2014, 8:09 pm
Posts: 1179
Location: Reading, Berks UK
Post Fuel Tank Slight Vacuum
This was odd, not something I've ever had on my Deuche. I went to refuel and there was a slight vacuum when I removed the cap.

How strange is that. I did have to bump up the idle the other day while on a trip as it seemed to undulate a bit and stalled. Drove 100 miles home at 60mph no problems at all, but a couple days later (today) it did falter a bit so I had to pull over on the way to the petrol station. Idled a minute and it was fine again.


October 26th, 2022, 9:33 pm
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Firing on two.
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Joined: March 21st, 2013, 12:04 am
Posts: 1577
Location: Exeter, Devon
Post Re: Fuel Tank Slight Vacuum
May not be related. Caps are designed to let air into the tank when there is a vacuume from using fuel. Try some WD40 on the cap.

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If you can't fix it with a hammer, it's probably electrical (or, an electric fuel pump!) ....


October 27th, 2022, 1:24 am
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Firing on two.

Joined: June 22nd, 2014, 8:09 pm
Posts: 1179
Location: Reading, Berks UK
Post Re: Fuel Tank Slight Vacuum
The fuel cap had been a bit stiff with the key for the last year or two and I finally got around to putting a bit of oil in the key slot a couple weeks ago which improved it hugely. Hmm I wonder if I've gummed up the vent. I shall investigate!


October 27th, 2022, 11:33 am
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