Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[des.allen]

James, I had a simular problem on my old facelift, it tuned out to be that someone had cross threaded the big plastic ring that holds the plate to the top of the tank, it only started leaking when pressure had built up, bone dry when not running.
HTH

[JamesV6CDX]

It's all bone dry around the ring..

[Sixstring]

Time to see the doctor when you have a leaking ring.........LOL!

(and I'm not talking from experience!!)

[JamesV6CDX]

Time to see the doctor when you have a leaking ring.........LOL!

(and I'm not talking from experience!!)

trust you.....

[Sixstring]

Sorry James, just trying to lighten the mood a bit.............

having a bitchin' time doing the wishbones, drop links and idler myself this morning, 4 out of 10 knuckles skinned so far........

better than you, though. Sorry I can't say anything really constructive and helpful!

[tunnie]

you do buy some right lemons don't you 

[JamesV6CDX]

you do buy some right lemons don't you 

break off

[Kevin Wood]

Hi Kev,

I still think the tank may actually need to come off :-/

Thing is, with it idling, even when you can see fuel piddling on the ground, the inspection area in the boot is bone dry.

It seems to be running down the very rear of the tank, bumper side, from the top. There is some sort of pipe up there too, can’t see what it is, though…

Only places where it should be able to leak are in the inspection area (pipes go forward from here, so leak unlikely to be evident from the rear of the tank) and where the filler enters the tank. Might be a breather pipe or something there that has chafed through, or a hole in the tank, I suppose. :-/

Might well be worth dropping the tank for a look, if only so you can be 100% sure you've nailed it. You know the drill after Marie's LPG conversion.

EDIT: I would say pull the fuel pump plate off and check the plumbing under it while you're at it, as I'm thinking something is spraying fuel around under there.

Kevin

[tunnie]

you do buy some right lemons don't you 

break off

Its about the only thing useful i could add to this discussion 

[JamesV6CDX]

Indeed, I know the score.

Maybe I should just leave it off, and put an LPG one in it's place 

[JamesV6CDX]

EDIT: I would say pull the fuel pump plate off and check the plumbing under it while you're at it, as I'm thinking something is spraying fuel around under there.

Kevin

If this is the plate in the boot, I've taken it off. All bone dry, even when fuel is dripping down the back onto the floor...

[Kevin Wood]

EDIT: I would say pull the fuel pump plate off and check the plumbing under it while you're at it, as I'm thinking something is spraying fuel around under there.

Kevin

If this is the plate in the boot, I've taken it off. All bone dry, even when fuel is dripping down the back onto the floor...

I meant the plate under that through which the fuel lines and electrical connections exit the tank.

Kevin

[JamesV6CDX]

EDIT: I would say pull the fuel pump plate off and check the plumbing under it while you're at it, as I'm thinking something is spraying fuel around under there.

Kevin

If this is the plate in the boot, I've taken it off. All bone dry, even when fuel is dripping down the back onto the floor...

I meant the plate under that through which the fuel lines and electrical connections exit the tank.

Kevin

Ah ok. So, unscrew the big ring? 

[2woody]

sorry, only just come to this....

glowing cats have two causes :-

first is a lean mixture, usually an inlet air leak, resulting in over-hot exhaust gas.

second is a large amount of unburnt fuel hitting an already-hot cat. obviously my favourite for this.

for that kind of fuel usage, you are probably beyond the damage that a bust lambda sensor could do, but you'll already need two new ones anyway.

I'd look at the fuel pressure regulator - it is possible for the diaphragm to burst, allowing pressurised fuel directly into the inlet manifold - that'd cause your problem.

next, look at lambda failure + coolant temp sensor failure, but this should be obvious from the datalog in the Motronic ECU.

regarding the fuel tank vent - there is only one and it's in the evap loss can under the wing - the rest of the system is sealed. With the engine OFF, the tank and the evap loss can are connected, allowing the vapour raised through heating the fuel in the tank on a hot day to be collected in the canister. With the engine ON, the putrge valve opens occasionally to allow the stored vapours to be drawn into the engine. ( it's the one above the breather box ). I would double check that the fuel tank is under pressure and not under vacuum. reason being that there isn't a ready source of pressure available to do this. Certainly fuel pressure couldn't cause a tank to become pressurised.

so, in conclusion....

replace the exhaust and all the lambda sensors.
check the fuel pressure regulator
check that all the sensors and vacuum lines are properly connected
make sure that the DIS pack is connected properly
check the fuel tank for splits / leaks

[JamesV6CDX]

sorry, only just come to this....

glowing cats have two causes :-

first is a lean mixture, usually an inlet air leak, resulting in over-hot exhaust gas.

second is a large amount of unburnt fuel hitting an already-hot cat. obviously my favourite for this.

for that kind of fuel usage, you are probably beyond the damage that a bust lambda sensor could do, but you'll already need two new ones anyway.

I'd look at the fuel pressure regulator - it is possible for the diaphragm to burst, allowing pressurised fuel directly into the inlet manifold - that'd cause your problem.

next, look at lambda failure + coolant temp sensor failure, but this should be obvious from the datalog in the Motronic ECU.

regarding the fuel tank vent - there is only one and it's in the evap loss can under the wing - the rest of the system is sealed. With the engine OFF, the tank and the evap loss can are connected, allowing the vapour raised through heating the fuel in the tank on a hot day to be collected in the canister. With the engine ON, the putrge valve opens occasionally to allow the stored vapours to be drawn into the engine. ( it's the one above the breather box ). I would double check that the fuel tank is under pressure and not under vacuum. reason being that there isn't a ready source of pressure available to do this. Certainly fuel pressure couldn't cause a tank to become pressurised.

so, in conclusion....

replace the exhaust and all the lambda sensors.
check the fuel pressure regulator
check that all the sensors and vacuum lines are properly connected
make sure that the DIS pack is connected properly
check the fuel tank for splits / leaks

Thanks for your detailed input mate.

In summary - misfire has been sorted with new DIS, plugs and leads.

Cats and exhaust are on order.

Only major problem now is the fuel leak at the tank end