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Mini Petrol leaking at the cap
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Author:  catzzmandu [ Fri Feb 24, 2006 5:04 pm ]
Post subject:  Mini Petrol leaking at the cap
Hullo,
Recently I changed my locking fuel caps for Monza fuel caps (similar to Aston but look better). This is the type of cap with the brass ring so you dont need any locking caps or keys (I had too many keys).

Monza Cap: http://cgi.ebay.com/classic-MINI-monza-fuel-filler-cap_W0QQitemZ4615629044QQcategoryZ43122QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Everytime I come home from a drive there is petrol all over the body near the caps. They have been fitted properly but I dont know what to do. Help

Also is there a special cleaner to get this off, as normal shampoo doesnt work well.

Oh & I wont put the old caps back because it was hell fitting them on. Please help!
Should mention too that they came with a circular cardboard bit (pictured in the link), I dont know what they were & threw em out, they didnt fit anywhere.
Author:  Mike_Byron [ Fri Feb 24, 2006 5:18 pm ]
Post subject: 
The bottom line is that your cap is not sealing against the neck of the filler cap (or the the brass ring thing) and petrol is sloshing out the neck past the cap under cornering etc.

It needs to be a seal - the tank is vented by other means. The cardboard thing should have been a synthetic or rubber compound that sealed the cap and tank and stopped the sloshing.

Perhaps buy a cheap petrol cap and pinch the seal ring. Fit it to the cap and seal the cap/neck connection.
Author:  catzzmandu [ Fri Feb 24, 2006 5:25 pm ]
Post subject: 
It was definetly just cardboard... Thanks though I will try that.
Otherwise is there some sort of sealant that could possibly used, what type?
Author:  sports850 [ Fri Feb 24, 2006 5:31 pm ]
Post subject: 
catzzmandu wrote:
It was definetly just cardboard... Thanks though I will try that.
Otherwise is there some sort of sealant that could possibly used, what type?


I would be very very careful and do plenty of research before you even considerred using a sealant on the fillers , I don't know what's safe to use but I know the normal silastic type silicon sealants aren't . A mate used some on his tank and it partially dissolved and filled the fuel lines with crud . Maybe your best bet here would be contacting the manufacturer's with photot's etc of the fillers on the car and see what they suggest .
Author:  drmini in aust [ Fri Feb 24, 2006 6:29 pm ]
Post subject: 
Yeah whatever you do don't use silastics. I did on the boat's tank gauge gasket once, this stuff floats around within the fuel and will cover the outlet strainer.. :evil:
Epoxy is OK with petrol. Think Araldite. :wink:
Author:  Fat Boy Dave [ Fri Feb 24, 2006 10:25 pm ]
Post subject: 
Yeah I have the same problem with my Monza style petrol cap. It was on the car when I got it. I was looking to see if I could get a locking style cap that might fit under the lid and create a better seal.

The main reason though is that it doesn't seal properly. My suggestion is to take the rubber seal off and head down to the plumbing shop and see what cistern washers they have that look the same but have a bit thicker rubber. also check that around the neck is a good surface to form a seal, i.e. no burrs or dirt or crap.

I should mention at this stage that I haven't yet done this so don't know if it will work or not. :roll:
Author:  Mini Mad [ Fri Feb 24, 2006 10:31 pm ]
Post subject: 
You may be able to get a good seal if you tank rim is still FLAT, but most are bent and/or pitted from people shoving screw drivers under there at some point and breaking one of the locking ones off..

I have never been able to seal mine..after many attempts...screw on..lockable..whatever..Just about every mini i have see, especially on a run where more spirited driving is done, has a leaky fuel cap :evil:

A thicker rubber gasket may be the go..
Author:  awdmoke [ Fri Feb 24, 2006 11:30 pm ]
Post subject: 
A thick nitrile rubber would be OK
have heard that graphite packing works well, but haven't tried it.
Author:  CPOCSM [ Sat Feb 25, 2006 7:24 am ]
Post subject: 
Just get a Jap 7.5 gallon fuel tank - they have the little flap on the inside(the one to stop you stuffing a leaded bowser hose in there...)

Havent had a leak since.

My theory is there are microscopic holes drilled by midgets around the entire rim of the tank. I tried everything with my tanks in the past and it still leaked fuel. Very frustrating and I empathise with your pain...lolol

Hooroo

Rob Forsyth
Miniot!!
Author:  drmini in aust [ Sat Feb 25, 2006 7:59 am ]
Post subject: 
And if you have acrylic lacquer, the toluene etc (aka paint thinners) in unleaded fuels strips the paint off the car... :evil:
Author:  Fat Boy Dave [ Sat Feb 25, 2006 10:42 am ]
Post subject: 
Can't you use toluene as an octane booster?
Author:  simon k [ Sat Feb 25, 2006 4:20 pm ]
Post subject: 
I've never had a cap that seals either.... I want to try welding (after removing it from the car and filling it with water of course) a ring at the end of the neck inside the tank, like modern cars have, like CPOCSM said, except I have an S and want to keep my twin tanks..
Author:  9YaTaH [ Sat Feb 25, 2006 6:59 pm ]
Post subject:  tuhmorrah
skssgn wrote:
I want to try welding (after removing it from the car and filling it with water of course) a ring at the end of the neck inside the tank


Did you see that on Mythbusters Simon :P

A friend is going hunting for two locking caps tomorrow...he says there is one type where the barrell extends deep into the filler neck and that reduces sloshing....of course ...still need nice flat faces and a good seal under the cap...
Author:  simon k [ Sat Feb 25, 2006 7:53 pm ]
Post subject: 
not really Mick, but I'm always thinkin' :P

let me know how your mate goes - my other idea is moulding something out of plastic that goes in the filler neck and fills it up, it'd lock on to the lip, and the cap goes over it...

I'll never get around to it tho :roll:
Author:  drmini in aust [ Sat Feb 25, 2006 8:19 pm ]
Post subject: 
I'm interested too, my RH tank's neck is pretty S/H and nothing seals. Cork, rubber, neoprene- screw on or locking type, the buggers ALL leak. :evil: :cry:
Might be time for a neckectomy too.... 8)
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