Transit P1211/PO251

[Colyer motorsport]

Transit 2.4 tdci 135 mk6 running bad and holding back. Had scan done getting codes p1211 injectors control pressure sensor above/below po251 fuel metering control. Done leak off test and all 4 injectors are good and same rules injectors out. I am just waiting for new fuel metering control to turn up. Could it be anything else giving me them codes ? Thanks

[wojciech]

Errors P0251 and P1211 are errors twins, usually occur together.

If no one would touch high pressure pomp per last 100-125.000 miles - we can be 99% sure pomp is finished, raddled, it needs regeneration.

You didn't gave results of leaking test
Was it test only on idle (time?), or test with part of the time on idle and on 3.000 rpm (times?), or maybe leakink test done with help of IDS tester? For last one upper limit of leaking for one injector is 35 ml.

After all, if high pressure pomp is in good condition, even very bad injectors do not cause errors and limp mode. Usually guilty is pomp. If injectors leak very much during errors P0251/1211 occurrence, their regeneration can help only for a few thousand miles.
Warm weather also increases the risk of occurrence errors P0251/1211 - because of fuel less density...

[Colyer motorsport]

Leak off test showed injectors are very good. Pump and injectors have done round 3000 miles they was fitted before I got the van but have receipts. All i am getting are them codes. I have new fuel metering control going be here tomorrow so hoping that will sort it

[wojciech]

Leak off test showed injectors are very good. Pump and injectors have done round 3000 miles they was fitted before I got the van but have receipts. All i am getting are them codes. I have new fuel metering control going be here tomorrow so hoping that will sort it

If you are sure about injectors and pomp, it can be:
- clogged fuel filter.
- clogged or bent fuel pipes
- broken IMV valve or his electric wires.
I didn't think it would happen - about tdci I'm always pessimist...


Are you sure that injectors and pomp was done correctly with washing whole fuel system against metal filings (including fuel tank)? During regeneration fuel system because of P0251/1211 errors, you must be sure: are or aren't metal filings (in fuel filter, in injectors).

[Colyer motorsport]

Hello thanks for the reply. The injectors and pump was done before I got the van but I do remember the person saying the tank and lines have been cleaned and the van as been fine up till few days back. The fuel filter on it as only done 800 miles and I did take it off and drain it to check filter and it all looked good and fuel was clean no bits

[Colyer motorsport]

I have 2.4 tdci mk6 2004 transit 2 weeks back now it started to play around holding back as if I was running out of fuel had van scan and it come up with p1211 injector control pressure sensor above/below and po251 injector pump fuel metering so I then done leak off test and all 4 injectors come back good then for last week van as been fine then today I done about 1 mile to drop my girl to school and went I come back to van it would not start so I had fuel filter off and it’s below half full ? Would the fault codes make this happen or am I looking at pump or air leak or could the fuel filter be no good it’s only been on van for around 800 900 miles
many thanks

Van had new pump just before I got it

[jonb1]

was the fault there before fuel filter was changed? what make of filter is it? if its only half full it sounds like air leak, through bad filter or filter seal, cracked filter housing , leak on injector spill pipes or damaged or rub through on fuel lines

[Colyer motorsport]

The van was fine before I change filter but the new filter been on the van for good 800 miles and it’s only just started to happen. It’s Mann filter

[wojciech]

Fuel system in 2,0 tdco has not fuel pump in tank, but high pressure pump has own smal vane pump. Vane pump sucks fuel from tank, so all fuel pipes between tank and vane pump works under negative pressure, including fuel filter.
If engine doesn't work, fuel want come back to tank and also is all the time under negarive pressure.
In this case each leak in fuel system, even the smallest, makes that fuel goes back to tank - in its place there is an air.

Typical place for leak in tdci fuel system - fuel filter holder, return pipes between injectors and pump or pump shaft gasket.
Maybe after leak test return pipe wasn't clipped correctly into injector? Check return pipe clips on the injectors.

[jonb1]

is it a tdci filter only ask cause i have had di filters fitted on tdci system, does sound like air ingress in fuel system any signs of dampness around filter or on fuel lines or on spill pipes, if i remember the spill pipes would crack on tdci & cause leak back because of spill pipe seals where pipes go into injectors worth a good look

[Colyer motorsport]

The filter looked the same as the old one and it’s what Euro car parts give from my reg. it did look little wet round the return pipes on injectors I am going to have good look tomorrow and try new filter. Would it be worth dropping tank ?

[jonb1]

cant see any need to drop tank at this point! hard part is finding air leak ( if that's what it is) but if all fuel lines have been off all connections want rechecking i tend to spray with brake cleaner & blow with air line any damp areas you can see if its just spilt fuel or a leak, have good look at spill pipes have had probs in past with them, check part number of filter is best way, mann filters are ok fit them all time, but did tend to just fit ford fuel filters on mk6 tdci as they were so fickle injector wise

[ned]

Your codes are pointing at the inlet metering valve on the pump.

Also the fuel filter is never full to the top when running, they are always about half full and if you don't believe me ask frag the ford tech

[Colyer motorsport]

Yeah I understand filter will not be full to the top but mine had around 1/4 in filter. I am doing the metering sensor on back of pump but I have been told that would not stop the van from starting or running on tick over ?
I have just had look at the return pipes from injectors and they are in bad way so going to change them and put new filter

[ned]

If the leak back pipes are bad then changing them is a good start imv can cause bad start if it's sticking and not allowing enough fuel through to the high pressure side, I have had issues with that in the past