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agriffo2000
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Post by agriffo2000 » Sat Jul 07, 2018 11:25 pm

Hello everyone,
my SS1 is leaking petrol from the filler cap.
I filled the tank up on Monday and pretty much as soon as I drove it away I could smell petrol. This continued off and on over the week and yesterday I realised that the top of the petrol cap was wet (with petrol) and there was a smear down the bodywork. This is the first time in quite a while I have filled the tank to the top and am currently reading 5/8 on the gauge.

Going by the "what did I fiddle with last" approach, I changed all the fuel/breather hoses a couple of weeks ago when the tank was 1/4 full, but I don't remember any fuel smell until I filled it to the top.

Baffle in the stainless tank come adrift and fuel is slopping back up the filler neck when I hurl it round bends?

The one way valve thing in the breather pipe - does it have to be vertical? I assume from the pictures there is supposed to be a bracket which it slots in to. I haven't got the bracket and so it is horizontal rather than vertical.

I have an aftermarket racing look filler cap (will post a pic when I get home from work tomorrow) rather than the original

thanks!



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Post by reliant-reviver » Sun Jul 08, 2018 6:48 am

Probably a poor seal between cap and neck. There's not much area for the seal to press on at the best of times and the edge does distort.

Alternative cap sounds a good idea.


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Post by GTC Ian » Sun Jul 08, 2018 9:48 am

Had the same problem on the SS1. In the end I fitted a new neck, as whatever i did ,I couldnt get the cap to seal . QRG have them. Didnt take long to change ( once I took the boot liner out) and hey presto no fuel slopping out the cap when full and no smell.


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Post by Alan SS1 » Sun Jul 08, 2018 4:19 pm

similar issues here, if park on a slope with O/S lowest, it vents . . .. through the lid,
mine has the simplest breathing version, ie a small pipe at RHS of tank up to the filler neck, I just accept that if tank is brimmed it will leak on a hot day unless parked level :-(


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Post by agriffo2000 » Sun Jul 08, 2018 8:41 pm

thanks folks,
as you can see from the photos, the whole assembly is aftermarket.
1a.JPG
1a.JPG (90.66 KiB) Viewed 895 times
1b.JPG
1b.JPG (102.97 KiB) Viewed 895 times
When fitting the new filler neck hose I undid the little screws holding the top ring down hoping to move the neck out of the way but although it wiggled a little bit, it wouldn't really move and I am not sure how it attaches to the original neck. In the process perhaps the seal got broken so I will probably have to try to strip the whole thing down which will not be fun.



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Post by Mikelima48 » Sun Jul 08, 2018 10:51 pm

Your aftermarket fuel cap looks good. What I found interesting is that whenever I 'brim' my tank it seldom goes much above three quarters full! Is this a fault of the breed?



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Post by Alan SS1 » Mon Jul 09, 2018 12:45 pm

I would wonder just how well the 'after market' is attached to the old steel / rubber filler neck ?

looks fun, boot liner out might shed some light on it, but maybe not cos the steel top frame (boot mounts to) might/will obstruct your view?


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Post by Roger Pennington » Mon Jul 09, 2018 2:49 pm

Mikelima48 wrote:
Sun Jul 08, 2018 10:51 pm
Your aftermarket fuel cap looks good. What I found interesting is that whenever I 'brim' my tank it seldom goes much above three quarters full! Is this a fault of the breed?
If you do literally "brim" it (i.e. the petrol is visible in the neck just below the cap), the the gauge should read full (assuming it's calibrated correctly). However the design, where the filler neck enters the tank on the side below the top, means there will likely always be air at the top unless it's brim-full like that.

Re filler caps in general, - the later cars with the vented system had non-vented caps, the earlier cars without the vents had vented caps, and were criticised in contemporary test reports for spilling fuel from the cap in hard cornering....


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Post by henryp » Tue Jul 10, 2018 12:13 pm

On gauge accuracy: I always brim mine to be just below the small vent hole and it has never showed full,
always being just over three quarters like Mike's, so I guess a fault of the breed (mismatch of sender and gauge ?).
That's even with pushing the rear of the car up/down to help purge any possible trapped air.
I agree that it 'should' read full, but the reality is that mine just won't.


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Post by Ford » Tue Jul 10, 2018 8:41 pm

Does the fuel sender have low resistance when full or empty?
If it's meant to be low resistance when full, the gauge only showing 3/4 might be due to high resistance in a wire or connector


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Post by philhoward » Tue Jul 10, 2018 9:09 pm

High resistance at the bottom of the tank, low at the top.


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Post by agriffo2000 » Wed Jul 11, 2018 12:15 pm

That's interesting about the contemporary test reports Roger!
Are these types of aftermarket cap interchangeable? I haven't got access to the car at the moment to check, but I don't think I saw a manufacturer's name in it.



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Post by philhoward » Wed Jul 11, 2018 12:32 pm

That looks like a Mocal one to me - like https://www.merlinmotorsport.co.uk/p/fl ... able-cap3s - measure to be sure as they come in different sizes.

Question is if the fuel has come through the seal on the outside or through the locking section (by guess is the latter judging by the rust stains in the cap itself)? Non-locking versions are available which might seal better.


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Post by agriffo2000 » Wed Jul 11, 2018 12:41 pm

yes, I thought exactly the same Phil!



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Post by Moschops » Sun Jul 15, 2018 2:22 pm

and were criticised in contemporary test reports for spilling fuel from the cap in hard cornering....
Done that. More than once :)


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