fault codes

[Darrenjoyce]

Hi All
just need a bit of advise, my 2005 3litre sat for 2 weeks when I was away, when I got back, my favourite light came on. we all know what I mean.
Anyway I borrowed my pals code reader and it came up with, b2879 fuel tank jet pump fault, the car started fine and drove fine, so I cleared the code, and to weeks gone by and not come back on, but this morning the lights back, now code reads p0441 evac emission incorrect purge valve flow, could these be linked,

any help would be greatfull

[J44EAG]

If this were my issue, I would not be touching the fuel system until I had established battery condition. As temps drop, so does battery terminal voltage. Older batteries and those that are partially discharged due to little vehicle use will tend to have a somewhat unstable battery voltage platform. In other words, a reliable terminal voltage of around 12.8V will ensure that these glitches are kept at bay. I`d suggest you take the car for a good hours run or use a mains powered battery charger to initially ensure the battery is up to snuff.

If the issue still persists, then again I`d be investigating the battery condition. A "drop test" at a garage loads the battery and it is possible to deduce the true condition of the battery. Weak and aged batteries are notorious for spoofing fault codes and getting us all in a flap! The process of diagnose, understand the problem and apply an appropriate fix is a logical method of ensuring the issue is attacked from the correct perspective.

If the battery gets condemned, replace only with a premium grade battery. Don`t bother with economy batteries. The stability platform is poor compared to premium grade units. Bosch or Varta "silver" batteries have been reliable in my experience. Economy cheapo batteries have not been!!

Hope that helps. Check battery condition and go from there.

Mike K

[Darrenjoyce]

Hi Mike

It's a new battery £120.00, went from Leicester to skeggy and back, done a drop test (as I have one) battery sound.
also just passed mot with flying colours, it has done 254000 miles but runs great, well looked after before me.

regards
darren

[J44EAG]

Ok, it seems you might have a fuel issue.

As I recall, two clips under the front edge of the rear seat will release the seat base giving access to the top of the fuel tank. I suspect you will then find connection blocks. It is perhaps worth separating those connectors and working them in an out a few times to clear any possible connector corrosion resistance hot spots. Then run the car again. If that doesn`t work, then you will have to delve deeper. Initially though, connector work might just clear the issue.

The internal fuel system within the tank is quite complex. Various pumps and jet units to contend with. I regret that apart from quickly looking at the schematic, I become a little lost at that point. May be others have a better insight into what gremlins might be at work either inside the tank or as regards control modules etc. It only takes one small issue to kick up irritating fault codes.

Mike

[Darrenjoyce]

Hi Mike

Thank you for your reply , I'm getting quite good at problem solving on these cars , thanks to you I now no were to start

Many thanks Mike

Regards
Darren