Fuel gas cap

I’m looking for the right cas cap to my 4.2 V8 supercharged. I’ve bought one but it’s not quite the same as the original. The old one have some sort of ventilation (?).

Can I use the one I bought or does it have to be the exact same?

See the attached pictures. The old one is the one in the car.

Bellhouse said:

I’m looking for the right cas cap to my 4.2 V8 supercharged. I’ve bought one but it’s not quite the same as the original. The old one have some sort of ventilation (?).

Can I use the one I bought or does it have to be the exact same?

See the attached pictures. The old one is the one in the car.

Click to expand...

Hi there,
You could just try it and see what happens.
If the engine cuts out due to be vacuum locked then you know its not a good match.

Mark Piercy said:

Hi there,
You could just try it and see what happens.
If the engine cuts out due to be vacuum locked then you know its not a good match.

Click to expand...

I'm not sure if I want to try and see what happens.

The car indicates that the fuel gas cap is missing and the engine light is on. I've read that it's probably caused by a faulty gas cap. I did try the new one but the engine light was still on and I was thinking that it might not be the right one for my car.

Have you checked the warning light with a diagnostic tool as you could end up looking in the wrong place?

Mark Piercy said:

Have you checked the warning light with a diagnostic tool as you could end up looking in the wrong place?

Click to expand...

No, unfortunately not. I don't have that kind of equipment yet.

Original cap seal looks 'problematic'.

myfirstl322 said:

Original cap seal looks 'problematic'.

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Exactly. That's why I bought a new gas cap. But the new one is not the same as the original.

I'm wondering if someone knows if it's a problem to use the new one or if it have to be the exact same? In my head there might be some sort of function on the "ventilation" in the old cap.

Bellhouse said:

Exactly. That's why I bought a new gas cap. But the new one is not the same as the original.

I'm wondering if someone knows if it's a problem to use the new one or if it have to be the exact same? In my head there might be some sort of function on the "ventilation" in the old cap.

Click to expand...

In my mind all caps should have a 'one way' vent because as you use fuel the tank must draw air in to fill the void...your 'aftermarket' cap should also have a vent.

If in doubt, replace it like for like.

Mark Piercy said:

If in doubt, replace it like for like.

Click to expand...

I'd fit it, then drive for 5 miles... then stop and check for serious vacuum upon opening the cap....maybe make that 2.5 miles as it's a Supercharged.

It's a plastic tank so it should handle a fair bit bit of vac.

I wonder if the seals are bonded or easily swapped between caps?

Mark Piercy said:

If in doubt, replace it like for like.

Click to expand...

I told the company that I want to change to the exactly right one (what i ordered) and they told me that "We sell a lot of these to the L322 and there has been no problem".

My goal with this car is to change the things that need to change to the original stuff.

myfirstl322 said:

I'd fit it, then drive for 5 miles... then stop and check for serious vacuum upon opening the cap....maybe make that 2.5 miles as it's a Supercharged.

It's a plastic tank so it should handle a fair bit bit of vac.

I wonder if the seals are bonded or easily swapped between caps?

Click to expand...

Yeah, I could try and change the seal from the new to the old and see what happens. But if it not works I can't send the item back.
I don't know. Maybe I just take the cost and order from somewhere else.

Where do you order spare parts?

Bellhouse said:

I told the company that I want to change to the exactly right one (what i ordered) and they told me that "We sell a lot of these to the L322 and there has been no problem".

My goal with this car is to change the things that need to change to the original stuff.

Click to expand...

Send it back if it doesn't match the description of what you wanted. You'll do well wanting to have everything the way it should be.

Bellhouse said:

Yeah, I could try and change the seal from the new to the old and see what happens. But if it not works I can't send the item back.
I don't know. Maybe I just take the cost and order from somewhere else.

Where do you order spare parts?

Click to expand...

If the 'bought' one is the correct listing for the L322 then just fit it, the manufacturer wouldn't be in business very long if they didn't work.

Sure it may look a little different but it should work.

Ok. I'll see how I do. Thanks for your help.

Very interested to hear back from you because my search resulted in a £45 price tag for a genuine cap! Tricky

Tricky of York said:

Very interested to hear back from you because my search resulted in a £45 price tag for a genuine cap! Tricky

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Yeah. And I live in Sweden so you have the shipping cost as well. I'll come back to you how things turned out.

Vented filler caps are not allowed as far as I know, there has to be a separate vent system.

Datatek said:

Vented filler caps are not allowed as far as I know, there has to be a separate vent system.

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Isn’t it a vent (of some sort) in my original gas cap? What can it be then?

Don't know if this will work for you but click on the various headings until you get to the relevant bit:
Lrcat

If all else fails, drop your trousers, bend over and ask a franchised Land Rover dealer to provide the appropriate item based on your chassis number.