Mark Ayling Posted July 23, 2002 Share Posted July 23, 2002 Posting this on behalf of PaulE who can't get to the BBS at the moment: He has noticed an intermittent petrol smell coming from (possibly) the drivers' side - originally wondered whether this was anything to do with the carbon filter thing ("What's This" thread) which vents to atmosphere, but that is on the passenger side. Definitely a petrol smell, not fumes - apparently someone has suggested maybe a leak from a manifold or gasket? Any ideas people? Link to comment Share on other sites More sharing options...
matt Posted July 23, 2002 Share Posted July 23, 2002 Well it should be easy to spot if it is a leak!! ...........the fuel pressure is very high in an injected engine ie it doesn't drip if theres a leak..... it sprays at high pressure!! Be careful Link to comment Share on other sites More sharing options...
Mark Ayling Posted July 23, 2002 Author Share Posted July 23, 2002 I think the trouble is that it is not always there, so its impossible to trace - I guess the answer may be to try and locate the source as soon as the smell is present...? Link to comment Share on other sites More sharing options...
Mark Ayling Posted July 23, 2002 Author Share Posted July 23, 2002 Oh and the thing about the spraying rather than dripping - I had a fuel leak from my FSE valve once where it dripped rather than spurting out - it was due to a blanking nut not being tight enough, therefore a very small amount was getting through. Link to comment Share on other sites More sharing options...
Adam W Posted July 23, 2002 Share Posted July 23, 2002 It's quite possible to get a trickle of petrol rather than a spray, it depends what's leaking and how bad it is. There will be a way of turning the ignition on and running the fuel pump without the engine running, this will be the safest way of tracking down any possible leak. It will involve bridging some connectors or something, I'm sure that info will be on mkiv.com or something. See if you can smell petrol when the pumps running - if so one of the fuel line components is leaking, you'll have to try and trace the line as it goes through the engine bay and inspect it for signs of wetness. If not, then it's something to do with the combustion process you can smell - don't know about the carbon filter, but if an exhaust gasket was leaking you'd smell exhaust smoke and hear weird noises, and if an inlet gasket was leaking you'd get running problems because metered air would be escaping. What's the carbon filter for exactly? Link to comment Share on other sites More sharing options...
Mark Ayling Posted July 23, 2002 Author Share Posted July 23, 2002 Originally posted by Adam Wootten What's the carbon filter for exactly? aha - see here: http://supra.highspeedhostinggroup.net/public_html/vbb/showthread.php?s=&threadid=2355 Link to comment Share on other sites More sharing options...
Ian C Posted July 23, 2002 Share Posted July 23, 2002 There aren't any fuelling components on the drivers side... Does that help? There are five pins going to the fuel pump cage assembly, three of them are for the fuel level sensor, and the other two simply power the pump. I can't for the life of me remember which two pins need power just to activate the pump, though. I suggest connecting an external power source to the correct pins to power the pump (12v DC) with the car battery's ground cable disconnected and well isolated. You can't be too careful with fuel stuff -Ian Link to comment Share on other sites More sharing options...
Ian C Posted July 23, 2002 Share Posted July 23, 2002 I found the fuel pump on a circuit diagram, it's positive feed is marked 'L' and the earth is 'W-B' I can't recall what L stands for, possibly blue? -Ian Link to comment Share on other sites More sharing options...
Guest Martin F Posted July 24, 2002 Share Posted July 24, 2002 There are two pins in the diagnostic port which you can short to make the fuel pump run continuously. Not sure exactly which ones they are, need to check the manual. Possibly the smell is coming from the charcoal canister as with the slightly warmer weather recently and the increase in petrol fumes things could be more noticeable. Check the connections to the cannister. Link to comment Share on other sites More sharing options...
Guest Martin F Posted July 25, 2002 Share Posted July 25, 2002 You need to short connections +B and FP in the diag connector and then turn on the ignition (not start the car) to get the fuel pump running. Link to comment Share on other sites More sharing options...
Dragonball Posted September 26, 2002 Share Posted September 26, 2002 Just to post an update for posterity - and if it happens to anyone else Having nearly taken the rear of the car to pieces when this smell appeared... The problem appears to have been caused by... would you believe it... wait for it, wait for it... the Petrol Pump size limiter (SVA required?) i.e. the thing that is fitted inside the petrol cap to ensure that only unleaded petrol pumps can fit It seems that the internal fume vent was blocked by the sheath of this thing - as it's only 15mm or so inside the entrance. AAARGGGHHHHH! I presume that this caused build up of petrol fumes that had to escape - but lord knows how it works - anyone got a diagram? Anyway - seems to be cured for the moment (everything crossed) Will keep updated - but knew you couldn't sleep for worrying! Cheers Paul:cool: Link to comment Share on other sites More sharing options...
Matt Harwood Posted September 27, 2002 Share Posted September 27, 2002 Since we looked at your car Paul, I seem to have aquired the same problem, not quite as bad but I can definately smell petrol... Paranoid perhaps! - I'll check my neck restrictor later. Link to comment Share on other sites More sharing options...
Dragonball Posted September 27, 2002 Share Posted September 27, 2002 Key - maybe it's a supra virus -and yuo have it now Psssst...pass it on Paul:cool: PS Dont forget my ICE package! Cheers m8 Link to comment Share on other sites More sharing options...
suprasport Posted May 26, 2005 Share Posted May 26, 2005 i have had the same problem for two years on and off decided after all the checks i had done pulling up etc and looking around it was definately down to the rear end as no smells from engine bay. and pretty sure it was from fumes build up around the tank, have heard there is a pressure valve but will check the restrictor first. Link to comment Share on other sites More sharing options...
JohnA Posted May 26, 2005 Share Posted May 26, 2005 Three years down the line and the thread is as fresh as ever! (stinks of fuel actually) I wonder if UK cars have the same weakness, or the factory-fitted vent is less prone to blocking... Link to comment Share on other sites More sharing options...
tbourner Posted May 26, 2005 Share Posted May 26, 2005 Weird, I noticed a petrol smell last night!! Come on here and this thread's been resurrected!!! Link to comment Share on other sites More sharing options...
Justin Posted July 2, 2006 Share Posted July 2, 2006 4 Years later I find this thread! I have ripped out most of the rear of the car as it has always been stinking of fuel inside the cabin. Will check my restrictor nozzle tomorrow. Definitely not coming from the engine bay fuel inlet, outlet, fpr or the fuel filter. Link to comment Share on other sites More sharing options...
Justin Posted July 3, 2006 Share Posted July 3, 2006 OK so it isn't the nozzle restrictor ring. That is no where near the breather hole. Not the fuel pump area either. Perhaps it's had a rear end shunt and there is a hole in the top of the fuel tank. Link to comment Share on other sites More sharing options...
michel lane Posted July 3, 2006 Share Posted July 3, 2006 i had the same problem , after 3 weeks of pulling the car apart i found it ...... When you upgrade your fuel pumps , you have to unscrew a plastic cap were the fuel pumps are located ...well its the seal of the cap that is the problem . If you notice there is a plack metel cap that goes over where the plastic cap is located , when you open these 2 items the seal is broken , hence the fumes escapes .. how you can test my theory is by putting a black bag over the hole and tightening the black metal cap on it , this causes a seal from the cabin . Now the cabin does not smell of fuel but when you park it up you can smell the fumes from the rear of the car , namely were it escapes into atmosphere ... to this tells me that the inner seal of the plastic cap is the problem ... i then sealed this , walla no more fumes , but now the smell is cominf from the front where the charcoal canister used to be . So i put the canister back on and now no smell at all ........then 3 weeks later the turbo goes pop !!!!!! how fustrating is this ....hope this helps Link to comment Share on other sites More sharing options...
Justin Posted July 3, 2006 Share Posted July 3, 2006 i had the same problem , after 3 weeks of pulling the car apart i found it ...... When you upgrade your fuel pumps , you have to unscrew a plastic cap were the fuel pumps are located ...well its the seal of the cap that is the problem . If you notice there is a plack metel cap that goes over where the plastic cap is located , when you open these 2 items the seal is broken , hence the fumes escapes .. how you can test my theory is by putting a black bag over the hole and tightening the black metal cap on it , this causes a seal from the cabin . Now the cabin does not smell of fuel but when you park it up you can smell the fumes from the rear of the car , namely were it escapes into atmosphere ... to this tells me that the inner seal of the plastic cap is the problem ... i then sealed this , walla no more fumes , but now the smell is cominf from the front where the charcoal canister used to be . So i put the canister back on and now no smell at all ........then 3 weeks later the turbo goes pop !!!!!! how fustrating is this ....hope this helps Brill thanks Michael. I'll give it a go sounds like the same thing maybe. Sorry about your tubbie. Link to comment Share on other sites More sharing options...
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