Fuel Filling (& leaking) question

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Fuel Filling (& leaking) question

Postby irishkeet » 12 Jun 2018, 20:12

Hello

Often when I fill the van to full, drive off and arrive somewhere I notice fuel has leaked around the petrol filler area.

I have a new Fuel Filler Neck Seal just like the one bricky is now stocking...

https://www.brickwerks.co.uk/fuel-filler-neck-seal-t3-syncro.html

I have checked all the hose connections and they are all fine. Does this happen to anyone else?

cheers
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Re: Fuel Filling (& leaking) question

Postby silverbullet » 12 Jun 2018, 21:20

Is the filler neck in A1 condition? They do rot...

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Re: Fuel Filling (& leaking) question

Postby irishkeet » 13 Jun 2018, 06:08

silverbullet wrote:Is the filler neck in A1 condition? They do rot...

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Hello

Cheers for the reply, what part do you mean the actual metal part itself?

cheers
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Re: Fuel Filling (& leaking) question

Postby silverbullet » 13 Jun 2018, 08:31

The part that the filler cap locks into.

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Re: Fuel Filling (& leaking) question

Postby silverbullet » 13 Jun 2018, 10:16

'85 syncro 'velle resto, '90 SA Microbus project, '95 SA Microbus 2.6i

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Re: Fuel Filling (& leaking) question

Postby irishkeet » 13 Jun 2018, 10:39

silverbullet wrote:https://www.brickwerks.co.uk/t3-parts/t3-syncro/engine/petrol-1-9l-2-1l/fuel-system/fuel-filler-neck-t3-syncro.html

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Cheers i did look the other day but i was focused on hoses, ill take a look at the filler and report back :mrgreen:
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Re: Fuel Filling (& leaking) question

Postby toomanytoys » 14 Jun 2018, 10:50

Check the seal on the filler cap.. these perish and fuel leaks out.. Would explain fuel spillage around filler neck..

Metal filler neck and pipe were in great condition when assembled and it hasnt been anywhere so I doubt they have rotted through...
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Re: Fuel Filling (& leaking) question

Postby irishkeet » 14 Jun 2018, 15:43

toomanytoys wrote:Check the seal on the filler cap.. these perish and fuel leaks out.. Would explain fuel spillage around filler neck..

Metal filler neck and pipe were in great condition when assembled and it hasnt been anywhere so I doubt they have rotted through...


Cheers Simon

I did change the seal but Ill take a good look on the weekend.
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Re: Fuel Filling (& leaking) question

Postby silverbullet » 14 Jun 2018, 18:50

Sorry gents, forgot that this van has had such a comprehensive rebuild!

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Re: Fuel Filling (& leaking) question

Postby tforturton » 15 Jun 2018, 09:23

I had to do this job a couple of years back. The metal neck was rusted almost all the way round, but until you pulled it clear of the seal, there was no visible sign of a break - just a strong smell of petrol. The thing practically fell apart when I removed it (watch out for rusty bits going down the filler pipe) but that said, it's not a difficult job.
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Re: Fuel Filling (& leaking) question

Postby irishkeet » 15 Jun 2018, 12:52

tforturton wrote:I had to do this job a couple of years back. The metal neck was rusted almost all the way round, but until you pulled it clear of the seal, there was no visible sign of a break - just a strong smell of petrol. The thing practically fell apart when I removed it (watch out for rusty bits going down the filler pipe) but that said, it's not a difficult job.


Hi
What end was rusted the filling end or the end the filler hose connects to?

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Re: Fuel Filling (& leaking) question

Postby tforturton » 15 Jun 2018, 15:11

Not rusted at the ends, but in a band around the middle - more or less under the seal. There was just one narrow strip intact, just about holding the top and bottom halves together...
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Re: Fuel Filling (& leaking) question

Postby toomanytoys » 15 Jun 2018, 23:43

As I have said. The filler neck cannot be rusted through unless something has been done to it since it was installed 3 years ago as it was mint and fully painted prior to assembly.
The seal for the plastic housing does nothing to stop fuel leaking out. It has no bearing on it. It’s around the filler neck and plastic housing.
The filler cap seal is the most likely culprit in this case. They perish and crack and fall apart. If the filler cap seal has been changed for something else then it has to be the right material and the right thickness to preload the spring.
I don’t know where you can get a new seal without buying a new cap (filler cap seals may be available shortly tho)
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Re: Fuel Filling (& leaking) question

Postby DSM » 16 Jun 2018, 09:01

If as Si says all has been refurbished i would suspect that if you fill up to the max the fuel is cold(ground temperature) and after a short drive this will expand due to heat from the engine and gearbox. This will run up either the expansion lines via the roll over valves and vent into the rear of the filler area or as suggested the main vent or fill hose and out through the cap seal.
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Re: Fuel Filling (& leaking) question

Postby irishkeet » 17 Jun 2018, 18:48

Took another look at the filler today, all good, bit of surface rust but as Si said it in good nick.
Image
Image

The new seal for the plastic housing is in good nick and I guess just stops dirt and rain entering.

As for the filler cap there is a chip in the side of the plastic but if the seal works correctly this should not matter. Looking at the cap I'm wondering if the seal has shrunk over the years as it does not reach the edge of the cap, what are other peoples caps like? Si you mentioned the possibility of new filler cap seals, any more info on this?
I see you can buy a replacement cap (https://www.brickwerks.co.uk/t3-parts/t3-syncro/engine/petrol-1-9l-2-1l/fuel-system/fuel-filler-cap-t3-syncro.html) but I like the original with the keyhole cover.

Image
Image



Or could it be what Duncan has said? But I think the fuel is coming out from the cap area but not 100%. I wonder if the seal in the cap bricky is selling could be put in an original filler cap?

DSM wrote:If as Si says all has been refurbished i would suspect that if you fill up to the max the fuel is cold(ground temperature) and after a short drive this will expand due to heat from the engine and gearbox. This will run up either the expansion lines via the roll over valves and vent into the rear of the filler area or as suggested the main vent or fill hose and out through the cap seal.
Regards Duncan.
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