Carbon canister and hoses.

[Sardonicus]

Under no circumstances connect a fuel tank breather hose to inlet vacuum with no charcoal canister fitted if the right conditions are met a full tank of fuel for example or a hot day when the fuel expands and needs to breath into the vent hose at best you are likely to fill the sump with neat fuel or worse suffer hydraulic lock its why you have the carbon canister fitted with a purge valve that pulses open and closed and not just wide open , you either vent to atmosphere (no intake manifold connection) or leave the stock EVAP system in place , there have already been instances where owners have flooded the canister with fuel after fill up and experienced stalling issues (rich) so the thought of having no purge control and just open entry to the tank over fill makes my toes curl

Edited by Sardonicus on Thursday 25th January 11:28

[ChimpOnGas]

When you switch to an aftermarket engine management system, typically it won't offer carbon canister purge valve control, for example on a Lloyds Canems installation while the canister may still be left in place the tank fumes are ultimately allowed to vent to atmosphere at the carbon canister output that would normally go to manifold vacuum.

The gasses are no longer occasionally sucked under engine vacuum through the carbon media and inhaled by the engine as with the 14CUX setup, they are merely left to travel down the hose and eventually naturally peculate through the carbon filtration media, this process is more active in the summer when the tank and fuel gets hotter as these conditions can cause pressure to build inside the tank.

Because my tank is half the size of the original one, and 99% of the time I'm driving on LPG, and because the petrol pump is still circulating fuel to the rail and back to the tank again even when I'm on gas there's quite a bit of fuel movement in the tank which on a hot day can create pressure that pushed excessive fumes down the carbon canister hose and ultimately out to atmosphere.

This was creating quite a stink, so I simply removed the carbon canister altogether and ran the pipe to my ally induction pipe running down the N/S inner wing so the engine could still consume the fumes. I was careful not to put the hose to full manifold vacuum because as Simon quite rightly points out that would be dangerous. If you apply full and permanent manifold vacuum to the tank it would simply be be way too much suck, so you'd run the very real risk of drawing raw fuel directly out of a full tank into the engine especially if it was brim full on a hot day, this is why Land Rover only permitted vacuum to act on the carbon canister occasionally and under certain conditions.

On my setup because there's no real vacuum in the ally induction pipe, just fast passing air going into the engine, it's not only perfectly safe but it's also proven to be a 100% effective solution to fume management. Once I put the system in place the stink immediately disappeared and normal service was resumed.

[FoxTVR430]

Hi guys and girls.
I need a bit of advice, I am busy rebuilding my 1993 Chimaera and did not take any photos before I took the carbon canister out. doh....
I can someone please tell me where each pipe should go. I believe that the top pipe in the picture that goes vertically is for the purge valve/Plenum. But the other two I'm not sure. One should e fresh air (in) and the other connection for vapours from the petrol tank.

Thanks,
Simon



[url]|https://thumbsnap.com/VI5ZycgA[/url

[Loubaruch]

This may help:

http://www.bertram-hill.com/replacing-the-fuel-lin...

[FoxTVR430]

Thanks, Loubaruch but that tells me how it works but not all the connections.
It seems that the early Chimaera's had a different canister that the later ones.
So can anyone have a look for me how the hoses are connected on the early version (1993)
Cheers