Hi Glen
The saloon fuel tank has to have a non vented cap as the fuel will run out
and down the side of the car when turning right. The venting arrangement is
from the top right of the tank and out through the bottom of the car behind
the right rear wheel, I can't find any info on the evaporative control
system for the PI for Australia, though there is info in the parts book for
carburatted cars! The fuel flow back to the tank is quite high at idle, but
reduces with load and speed. The flow at idle with a low fuel tank will
sound like peeing in to water! I hope that helps you assess how much fuel is
returning to the tank.
I assume as you fitted all this kit yourself that you have the return pipe
going to the union in the middle of the top of the tank.
Have you got the works Spare parts catalogues, if not I will scan and send
you the relevant pages for the fuel tank for all cars and regions.
Graham.
Ps if you need clarification on the breather I can do a digipic of a tank
and where the breather leaves the car.
----- Original Message -----
From: "Glen Johnson" <glen@littledevil.com.au>
To: <triumphs@autox.team.net>
Sent: Wednesday, September 04, 2002 12:31 AM
Subject: Fuel leak in Newly built PI. [ help ]
> On our newly built PI motor (fitted to a 2500 S saloon) we have ran new
> fuel lines etc and as part of the conversion from carbs to PI have had
> to install the PI fuel tank.
>
> At the moment we are getting a lot of fuel appearing in the boot. I
> checked for leaks when then engine wasn't running and found none.
>
> With the engine idling we are losing large amounts of fuel from the hose
> that returns 'left over' fuel from the metering unit into the tank.
> Obviously at idle we are using the least fuel and the fuel pump is still
> pushing to keep the pressure up.
>
> I came to the realisation that the fuel return lines (from the pressure
> relief valve and the metering unit) should be just trickling or flowing
> freely back into the tank. The whole system is pressurised at the
> moment and the return lines are having to fight to get back into the
> tank.
>
> Now normally I would assume that there is meant to be a vented fuel cap
> or a vent line out to a charcoal canister or something. I have no vents
> - my cap is of the closed type and every diagram I look at does not show
> any venting.
>
> Can someone explain what I should do?
>
> I was thinking I would get one of the old white vapour trap thingo's
> that sit on an emission controlled car in the boot above the fuel tank -
> and tap a line from the top of the tank or the fuel filler hose and sit
> the vapour trap high up in the boot. I was then thinking that from the
> vapour trap I would run another piece of hose to below the car somewhere
> so it could vent out to free air.
>
> What are other people doing>??? Should I just look for a vented cap or
> am I looking at this from the wrong way.
>
> Glen Johnson
> Head of Creative Services
>
> Little Devil Media
> L2 - 83 Salamanca Place,
> Battery Point, Tasmania.
> Australia
>
> Phone (+61 3) 6224 8988
> Facsimile (+61 3) 6224 3545
>
> http://www.littledevil.com.au <http://www.littledevil.com.au/>
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