johnwill Posted June 12, 2022 Report Share Posted June 12, 2022 Hi my PRV refused to come undone, so removed the petrol tank to give me a fighting chance. That sorted it, however, looking at the petrol cap, it has a hole (threaded) half way down the “shaft”. The hose between cap and tank seems to have been fitted slightly over the boss for the hole, warping the hose a little, although I imagine the circlip still sealed it ok. is this the breather? And could it be the cause of the petrol smell in my boot? Does it need anything else attached? the moss pictures shed no light on it thanks John Quote Link to post Share on other sites
BlueTR3A-5EKT Posted June 12, 2022 Report Share Posted June 12, 2022 Yes it is for breather on NAS cars with carbs. Whatever you do be sure the tank has a breather either through that vent via a filter that is fed from outside the car/boot, or through a hole pierced in the rubber seal of the fuel cap Quote Link to post Share on other sites
johnwill Posted June 12, 2022 Author Report Share Posted June 12, 2022 12 minutes ago, BlueTR3A-5EKT said: Yes it is for breather on NAS cars with carbs. Whatever you do be sure the tank has a breather either through that vent via a filter that is fed from outside the car/boot, or through a hole pierced in the rubber seal of the fuel cap Mine is a 73 CR pi. Is it the wrong cap? Quote Link to post Share on other sites
BlueTR3A-5EKT Posted June 12, 2022 Report Share Posted June 12, 2022 The connector hose for that cap would have had a half circle cut out to clear the breather boss. That way the hose would not have to be eased up over the boss. Either fit a threaded adapter in the hole with a long vent pipe to the outside world beyond the boot or block it and pierce a vent hole in the cap rubber seal as an original PI would have had. Yes the stink of fuel in the boot is compounded by the vent in the filler neck terminating in the boot area. Quote Link to post Share on other sites
Waldi Posted June 12, 2022 Report Share Posted June 12, 2022 John, the hose itself can be a source for smell too. I replaced mine with a special filler hose from Revington which cured the smell, almost completely. Highly recommended and not expensive at all. Waldi Quote Link to post Share on other sites
nickw71 Posted June 13, 2022 Report Share Posted June 13, 2022 I'm just about to replace the fuel filler hose which I suspect isn't helping the petrol smell in the boot. The Brown Book says "use sealant as necessary" when refitting the filler hose. Does anyone bother or are the clips sufficient? Waldi - thanks for tip on the Revington product. I've actually bought a hose from Rimmers but just called them and they couldn't tell me if it was E5/E10 compliant or what it was made of other than it's UK made. It looks more like a nitrile than a standard rubber but might go for the Revington hose to be on the safe side. Anything to get rid of the smell in the boot! Quote Link to post Share on other sites
Waldi Posted June 13, 2022 Report Share Posted June 13, 2022 Your’e welcome Nick. No sealant is required in this area. Cheers, Waldi Quote Link to post Share on other sites
johnwill Posted June 13, 2022 Author Report Share Posted June 13, 2022 On 6/12/2022 at 4:02 PM, Waldi said: John, the hose itself can be a source for smell too. I replaced mine with a special filler hose from Revington which cured the smell, almost completely. Highly recommended and not expensive at all. Waldi Ordered from Revington, thanks Quote Link to post Share on other sites
Keith Warren Posted June 15, 2022 Report Share Posted June 15, 2022 I fitted the one from Remington, my filler cap had the same tapping point which could stop the pipe fitting without letting vapour through so I blanked the hole off with plug then ground off flush, so far think it has improved the fumes in the boot. Keith Quote Link to post Share on other sites
Andy Moltu Posted June 16, 2022 Report Share Posted June 16, 2022 No sealant for the pipe. Most sealants are not designed for prolonged exposure to fuel so when changing things like sender gaskets make sure the sealant is capable of withstanding imersion in fuel. Quote Link to post Share on other sites
johnwill Posted June 16, 2022 Author Report Share Posted June 16, 2022 Fitted new “vented” cap, and tonight, the 6 kept coming to a halt every 10 minutes or so. released the cap, and lots of pressure released. Car ran again, for 10 mins or so, released cap again and ok again. the rubber on the new cap has a very small slit in it, like a Stanley blade cut. is this enough? Should it have a 2 or 3mm hole in it as I’ve seen suggested using Google? should the cap itself have a hole in it, or is a hole in the rubber enough? thanks john Quote Link to post Share on other sites
Mk2 Chopper Posted June 17, 2022 Report Share Posted June 17, 2022 That's disappointing to fit the vented cap but finding it doesn't do its job! I'm guessing the slit is just resealing and a physical hole as you suggest would work better. Have you contacted Revington to see what they say? Gareth Quote Link to post Share on other sites
johnwill Posted June 17, 2022 Author Report Share Posted June 17, 2022 (edited) There should be a 1.5-2 mm hole through the rubber and the plate behind it. There wasn’t. they offered to send the correct one, but I decided to drill the hole as I need the car on Sunday. drilling completed, just need to test the car now. I did run it for 5 minutes, and no “pressure” sound when I released the cap, so should be fine. John Edited June 17, 2022 by johnwill Quote Link to post Share on other sites
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