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[Migv6 le Frog Fan]

Im leaning towards the pump too. Would like to prove it before playing parts darts, but not sure if thats reasonably possible ?

[Viral_Jim]

But not sure if thats reasonably possible ?

Tbh without some equipment to bench test it (and a spec sheet to test it against) I'm not sure how you would. Assuming it is the problem it clearly it still work partially, but all the tests I can think of (flow rate etc) involve knowing what good looks like. Hard without another one on hand  .

Do you have any other fuel pump you could use to rig up as a temporary to test the car with?

[Doctor Gollum]

Havent checked code yet, but I expect cylinder 3 misfire, because it always is. Even when I swapped spark plug, injector and stick coil  from 1 to 3.
A mechanic on another forum said that he has found that cylinder related codes on these should be taken with a pinch of salt, and can be a red herring.
Think its the last one on the rail but will need to check.
Im now also wondering if it could be a sign of fuel pump starting to fail. Not sure how to diagnose for sure though.

By the time you have removed it to test, you may as well put a new one in 

[Viral_Jim]

Just a thought,.have you got a diagnostic that could read the pressure at the fuel rail? That might tell you more...

[Migv6 le Frog Fan]

Possibly. Will have a play with my Autel tomorrow. If I could get a reading now when its running ok, then do it again when fuel level is low and it misbehaves again, I might get a good idea if thats the prblem.

[Kevin Wood]

You might find a schraeder valve on the fuel rail to connect a pressure gauge. Unless it's a GDI engine I doubt it will monitor fuel pressure.

I struggle to see why it's consistently misfiring on one cylinder if it's a fuel pressure issue, to be honest. It would affect them all (said like it's got enough of them!).

Maybe the pump is drawing air occasionally and it always gathers in the rail around one injector?

Can you look at the fuel trims using a scanner?

[Migv6 le Frog Fan]

Will have a look at the fuel system later and see whats involved.
Just read the codes and it was a bit of a surprise. Low Cat efficiency. 

[Doctor Gollum]

Will have a look at the fuel system later and see whats involved.
Just read the codes and it was a bit of a surprise. Low Cat efficiency. 

Does it clear?

[Migv6 le Frog Fan]

Yep 
Only difference this time is that I stopped at a petrol station after 5 minutes (after which it ran fine) rather than carry on driving for miles.

[Doctor Gollum]

It may just be the last of the crappy fuel going through 

[Migv6 le Frog Fan]

Who knows. Fuel system looks very basic. No schraeder valve. Pipe comes from the tank to a white plastic block (some kind of valve ?) and then to the fuel rail. If number one pot is the timing chain end (not sure) then number three is the first one supplied at the fuel rail.

[Nick W]

Who knows. Fuel system looks very basic. No schraeder valve. Pipe comes from the tank to a white plastic block (some kind of valve ?) and then to the fuel rail. If number one pot is the timing chain end (not sure) then number three is the first one supplied at the fuel rail.

You could find out! Unhook the return pipe, drain 100ml of fuel into a clear glass jar and inspect it for dirt, water or diesel. Do that a couple of times before you make any irrecoverable decisions.

[Doctor Gollum]

If Injector 3 is the first to receive fuel then it makes sense that it would be the first to be affected by contamination. Swapping with another injector would temporarily resolve the issue but it will eventually return.

The cat code suggests that what's reaching the cat isn't what it's expecting to see. As you've potentially 2/3 of the injectors not performing correctly that points to either a contamination or delivery issue...

The two aren't mutually exclusive as contaminated fuel will make the pump work harder and will eventually kill a weak pump.

Run it more or less dry, drop the tank, clean the inside of it and replace the pump and pick up strainer. You could add new injectors to the list as a belts and braces solution depending on what you find in the tank.

[Migv6 le Frog Fan]

Who knows. Fuel system looks very basic. No schraeder valve. Pipe comes from the tank to a white plastic block (some kind of valve ?) and then to the fuel rail. If number one pot is the timing chain end (not sure) then number three is the first one supplied at the fuel rail.

You could find out! Unhook the return pipe, drain 100ml of fuel into a clear glass jar and inspect it for dirt, water or diesel. Do that a couple of times before you make any irrecoverable decisions.

There is no return pipe. 

Tank / pump is easily accessed under the rear seat. When its run almost dry again I will remove the pump and clean out the tank. If that doesnt fix it then I will load up the parts cannon - firstly with a pump, then take it from there. 

[Doctor Gollum]

Not having to get under the car and drop the tank is a big plus