[TR] TR 6 evaporative system

[davgil at aol.com]

Thanks Dave and Jeff.  I think that while the vent line may be partially blocked, it is sufficiently open to pass vapor and fuel.  I think that Jeff may have hit on the problem being the anit-run on valve.   I was working on the fuel system, I think that I have inadvertently knocked a couple of connections off of the oil pressure sending unit.  My gauge registers oil pressure properly, and that wire was not disconnected.  However, if I put the two wires back on one way, the oil pressure warning light comes on and stays on.  This is clearly wrong, so I reversed the wires.  I cannot tell if the anti-run on valve is now working properly.  I did note that when one of  the wires accidently touched the oil pressure wire, I saw a spark and clearly heard a click at the anti-run on valve solenoid.  However, when I connected the wire to the other post on the sending unit, I could not hear a click when cranking or shutting down the engine.  I have looked through my Haynes manual, but don't see a diagnostic procedure and the only wiring diagram I have is for a RHD PI unit.  Mine is LHD carbureted.  Any advice as to how to verify the correct wiring for the anti-run on valve?David


-----Original Message-----
From: DAVID MASSEY <dave1massey at cs.com>
To: fishplate at gmail.com <fishplate at gmail.com>; davgil at aol.com <davgil at aol.com>
Cc: triumphs at autox.team.net <triumphs at autox.team.net>
Sent: Fri, Jul 30, 2021 7:36 am
Subject: Re: [TR] TR 6 evaporative system

 It could be many things.  I had an issue like this but the engine died after a few minutes.  When I opened the gas filler there was a great rush of air and the tank oil-canned.  My problem turned out to be the vinyl hose leading from the trunk area to the engine bar had sagged down and contacted the exhaust system and melted shut.
Make sure your system is per design and not missing something.  There is typically a liquid/vapor separator near the tank.  If that was bypassed you will get liquid fuel where it shouldn't be.
 
Dave 

 
 
-----Original Message-----
From: Jeff Scarbrough <fishplate at gmail.com>
To: davgil at aol.com
Cc: triumphs at autox.team.net <triumphs at autox.team.net>
Sent: Thu, Jul 29, 2021 7:20 pm
Subject: Re: [TR] TR 6 evaporative system

Is the switch/valve on the bottom of the carbon canister operating correctly?

Jeff Scarbrough
Corrosion Acres, Ga.

On Wed, Jul 28, 2021 at 3:04 PM <davgil at aol.com> wrote:
>
> I just replaced the fuel tank in my 1976 TR6 and after a short drive, I noticed a leak coming from the vent connection on top of the tank.  I tightened the nut on the connection, but don't really understand why there would be gas in the vent line.  I also noticed that when I opened the fuel cap, there was a hiss like a suction.  I feel that either the vent line, which seems open when I blow air through it from the cannister attachment or the carb bowls (ZS 175s) may be too full and there is a vacuum that is pulling fuel out of the bowls.  My TR6 does run rich.  I don't understand why there would be a vacuum in the tank.  Also, I noticed a bit of oil around the oil fill cap which I have never seen before.  I checked the oil and the level seems correct.  I thought I smelled a bit of gas in it, but that may have been a bit of imagination on my part.  Any suggestions would be appreciated.
> Regards,
> David Gill
> 1976 TR6
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