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[JamesV6CDX]

Remove the fuel pump insepction plate in the boot and check for damage and/or excessive corrosion around the plate on top of the tank.

Will do, Mark - I like nice easy jobs like that

[Marks DTM Calib]

Yeh well....that would give a poor fuel supply which can give a lean mix which in turn makes it run hot.

[JamesV6CDX]

Yeh well....that would give a poor fuel supply which can give a lean mix which in turn makes it run hot.

Thanks Mark... do you think that could be related to the excess fuel pressure?

[Marks DTM Calib]

Yeh well....that would give a poor fuel supply which can give a lean mix which in turn makes it run hot.

Thanks Mark... do you think that could be related to the excess fuel pressure?

How do you know you have excess fuel pressure......or are you refereing to the tank pressure?

[JamesV6CDX]

Yeh well....that would give a poor fuel supply which can give a lean mix which in turn makes it run hot.

Thanks Mark... do you think that could be related to the excess fuel pressure?

How do you know you have excess fuel pressure......or are you refereing to the tank pressure?

In honesty Mark, I'm basing it on -

A) The fact there is some evidence of some petrol running down the back of the tank.

B) When I removed the filler cap, there seemed to be loads of pressure in the tank. (I thought this, due to the amount of petrol smelling vapour that came out, when I removed the filler cap)

c) I (still) cannot get my head around, where 40 litres of fuel went, in 15 miles

[Marks DTM Calib]

I suspect it went over the road due to a leak around these pipes......

Its certainly the first thing to check as its quick and easy to do

[JamesV6CDX]

First job, then

[Psychoca]

I was wondering if the fuel consumption could be the fuel pump nspection tank.  When it was off on my tractor, I had diesel covering the back of mine, which obviously gave me a strong diesel smell...  It also gave quite a strong smell in the car, but then, I wasn't doing motorway speeds...

[Mr Skrunts]

This is a petrol one though. Would the problems not be different between petrol and diesel.

[JamesV6CDX]

This is a petrol one though. Would the problems not be different between petrol and diesel.

I think the tank setup is roughly the same, though? Not 100% sure.

[Andy H]

Sounds like massive overfuelling to me, so try with the MAF disconnected.

Does it misbehave from cold or just when hot?

If just when hot, try unplugging the Lambdas.

Failing that, high fuel pressure? FPR / blocked fuel return line.

Maybe a stuck open injector (all plugs will be black after a cold start or period of idling. Check for a very wet one).

Only vent from fuel tank is into breather box so that can be disconnected from the purge valve to eliminate it.

Check the oil for fuel contamination too.

Kevin

Are you sure?

The idea of the purge valve connection to the plenum is to pull fresh air through the carbon canister to purge it of fuel fumes. Ergo there must be a permanently open vent of some kind on the canister in addition to the connections for the tank and the purge valve. :-/

[JamesV6CDX]

UPDATE

Tonight I changed the DIS pack, plugs, and leads, for brand new components. All OE stuff unfortunately, VX prices would have been prohibitive. But nonetheless proven on other cars.

I then removed the plate mark suggested, and checked the fuel connections on top of the tank. They are definately quite corroded, BUT, secure and not leaking.

I tried to start her up after this - just wouldn't go. I ended up flattening the battery. Put a can of petrol in - still nothing, despite the fact there was pressure in the rail when the release valve was pressed, and a spark on all plugs.

Charged battery for a bit, and got 2 more cans of petrol. After a lot of cranking and coughing, she then fired up.

At this point, I had a result!

She fired into life, misfire totally gone, smooth as silk. Comparable to a 40k mile engine.. really quiet, and responsive to the throttle (when I'd let it warm up, obviously!)  8-)

I let her idle for a bit on the driveway.. exhaust sounded... wrong. Blocked. I cable tied a rubber glove to it, and it wouldn't inflate the glove!!!!!

After letting it idle, I had a look under the fuel tank. Couldn't see any drips etc.

Took her for a spin around the block, I had covered half a mile, when the guy behind flagged me down.

"Your car's pissing fuel everywhere mate!" 

Had a look, sure enough, puddle underneith. Inspection area still all dry though. Though I could smell petrol if I put my nose to it.

There seems to be a fuel mist everywhere... I am thinking, possible pin hole somewhere???

Now the engine runs so well, I just wonder if in fact, the fuel thing is unrelated, and an unfortunate co-incidence...  :-/

[VXL V6]

I'd work with the known issue first, unblock the exhaust, it surely can only be the cat or the silencer collapsed?

[JamesV6CDX]

I'd work with the known issue first, unblock the exhaust, it surely can only be the cat or the silencer collapsed?

Yep, I have a new pair of cats and complete new exhaust on order

Blocked exhaust wouldn't cause a major fuel leak though, would it?  :-/

[VXL V6]

Well if it can't blow up a rubber glove then what's happening to all the exhaust? the back pressure must be incredible.