Micra fuel tank leak

[DiyNutJob]

I was simply explaining the difference, for the academically challenged

Many academics are logically challenged. This is why many PhD's have no common sense. The natural state of petrol is gaseous. This is the reason why it evaporates. This is also the reason why the americans call petrol "gas" - they are being more scientifically accurate.

All the available evidence indicates a gas leak:

1. Petrol gone
2. Loosey cap
3. Rust bubbles around the cap seal
4. Dirt patch on car body around the fill door.

For the 4th point, the escaping gas cloud met moisture as it rose. The combination got too heavy and "rained" back down. The gummy combination is then deposited around the fill door. Dirt blown around by wind then attaches to the gum. The dirt then attracts my attention for a serious study of the issue.

 

[DiyNutJob]

Did you miss the bit about the US gallon of petrol, taking 32 days to evaporate, at 72F, from an entirely open container?

Did you miss my study of evaporation from a leaky container? The US study does not contradict mine. Their parameters are different.

 

[Harry Bloomfield]

For the 4th point, the escaping gas cloud met moisture as it rose. The combination got too heavy and "rained" back down. The gummy combination is then deposited around the fill door. Dirt blown around by wind then attaches to the gum. The dirt then attracts my attention for a serious study of the issue.

Perhaps you should write a dissertation on evaporation, after you've fixed the hole in the bottom of your fuel tank?

 

[DiyNutJob]

Perhaps you should write a dissertation on evaporation, after you've fixed the hole in the bottom of your fuel tank?

No, I have better things to do. I will sand the rust bubbles instead and find ways to prevent the debris going down the neck. Failing the sanding, a new china neck it is.

 

[carmanmemoranda]

No, I have better things to do. I will sand the rust bubbles instead and find ways to prevent the debris going down the neck. Failing the sanding, a new china neck it is.

Feel free, ignore the mot advice given.

If fuel can leak (it doesnt have to be leaking at the time of the test) then a tester has the right to refuse to test, or to fail it.

A hole in the filler neck automatically means fuel can leak.

 

[Mottie]

The natural state of petrol is gaseous.

No it’s not, it’s liquid.

 

[DiyNutJob]

If fuel can leak (it doesnt have to be leaking at the time of the test) then a tester has the right to refuse to test, or to fail it.

How do you tell it can leak?

A hole in the filler neck automatically means fuel can leak.

There is no hole other than rust spots that might prevent air tight sealing. The key word is "might". It might not.

 

[DiyNutJob]

No it’s not, it’s liquid.

It's only liquid under some pressure.

 

[carmanmemoranda]

How do you tell it can leak?

A hole, or signs of previous leakage.

There is no hole other than rust spots that might prevent air tight sealing. The key word is "might". It might not.

You asked previously how to measure how much it might leak, post 24.

Either there are holes or there aren't. Any sign of fuel spillage looking from underneath? Testers will look for evidence.

 

[DiyNutJob]

Either there are holes or there aren't. Any sign of fuel spillage looking from underneath? Testers will look for evidence.

There are no holes but a potential lack of a full seal at the cap. I too looked for evidence and found leaked petrol deposited on the body paint all around the fill neck door. After cleaning up, nobody would be the wiser.

 

[Mottie]

It's only liquid under some pressure.

What pressure is petrol under? Pressure has nothing to do with it. It’s liquid. Pour some into a jar and look at it you idiot.

 

[carmanmemoranda]

There are no holes but a potential lack of a full seal at the cap. I too looked for evidence and found leaked petrol deposited on the body paint all around the fill neck door

After cleaning up, nobody would be the wiser.

Lack of seal is a fail, straight forward....

(b) Fuel system: (i) leaking, or missing or ineffective filler cap (ii) leaking excessively or a risk of fire

Major Dangerous

And you say nobody would be any the wiser after you have cleaned up, have you cleaned all of the filler pipe work underneath the car?

 

[Jurassicspark]

It's only liquid under some pressure.

You been studying about EVAP systems too much lately?

 

[DiyNutJob]

Lack of seal is a fail, straight forward....

How do you know the seal is lacking?

And you say nobody would be any the wiser after you have cleaned up, have you cleaned all of the filler pipe work underneath the car?

The leak is at the top. Why would I clean the bottom?

 

[DiyNutJob]

You been studying about EVAP systems too much lately?

No. I have been studying petrol evaporation recently, and how it made the car paint dirty.