Possible fuel pump

[maccavvy]

Garage have had it over a week.
Leak off tests are fine.
He's done a couple when warm and cold.
No air leaks in pipes .
No faults showing on any sensors.
But when turning over struggles to get pressure he says lazy/worn pump??
Vans done 190k and no history of being changed before.
What you guys reckon

[knobby1]

Garage have had it over a week.
Leak off tests are fine.
He's done a couple when warm and cold.
No air leaks in pipes .
No faults showing on any sensors.
But when turning over struggles to get pressure he says lazy/worn pump??
Vans done 190k and no history of being changed before.
What you guys reckon

TDCi pumps rarely fail, have you had a full set of learns done, via IDS or Forscan..??

Lord Knobrot

[bambi mk 1]

Have you tried starting it on easy start Could be a simple thig like an ign switch

[knobby1]

Have you tried starting it on easy start Could be a simple thig like an ign switch

Good call sir..!

Lord Knobrot

[daraioj]

Garage have had it over a week.
Leak off tests are fine.
He's done a couple when warm and cold.
No air leaks in pipes .
No faults showing on any sensors.
But when turning over struggles to get pressure he says lazy/worn pump??
Vans done 190k and no history of being changed before.
What you guys reckon

"He's done a couple when warm and cold"

So the engine does start, right? Or does it?
What sort of pressure do you read on idle or when cranking it.

You won't be able to do the learns if it doesn't idle.

And isn't it the SCV the valve that controls the rail pressure? Might be worth checking it's working properly.

[maccavvy]

I've no idea what you mean by learns .
It is temperamental to start..generally it can be anything from 5 to 10 seconds of turning over.
When running it drives fine.
Sometimes when ticking over it goes into limp mode.
He said when cranking its about half the pressure it should be.
The SCV has been changed 6 months ago along with PRV.
This issue went from pain to start 1st thing. Slowly got worse to wouldn't even start last Monday. After being stood overnight

[daraioj]

I've no idea what you mean by learns .
It is temperamental to start..generally it can be anything from 5 to 10 seconds of turning over.
When running it drives fine.
Sometimes when ticking over it goes into limp mode.
He said when cranking its about half the pressure it should be.
The SCV has been changed 6 months ago along with PRV.
This issue went from pain to start 1st thing. Slowly got worse to wouldn't even start last Monday. After being stood overnight

All valves are slightly different from each other and the pump learn is a procedure by which (and do correct me if I'm wrong here) the ECU fine tunes the current the scv needs to achieve the right rail pressures. The pilot learn fine tunes the pre-inyection to reduce vibration at low revs.
If the van idles the you should be able to carry out those procedures and see if that makes a difference. If the scv is not working properly the pump learn will most likely fail.
It doesn't sound to me like a faulty scv though.

[knobby1]

Could even be just air in the system....worth checking at least. Is the fuel filter empty after standing overnight or a day or two..??

If the fuel rail pressure was half what it should be, it would never start....the PCM would never activate the injectors if that were the case.
Were the learns done after fitting the new SCV & PRV...??? If not they will need to be done or she'll never run properly.

Lord Knobrot

[maccavvy]

i have posted regarding this before..

It started a few weeks ago. 1st start in the morn took loads of turning over. did it next day and filter was half full.
filled it manually then got it to run was fine all day .
changed filter as precaution.
was fine for 2 days then half empty again.
changed filter to gen ford and gen ford housing and leak off seals too .no change
slowly over the previous days went to being a pain over night to being a pain if left for a few hours at a job to being a pain if left 10 mins to start
to a point where it started running battery flat so had to put booster on it
Garage said batteries were dead so put new on , turned over quicker and started better .
but still taking 5-10 seconds of turning over to start .

When i had the scv and prv changed 6-8 months ago and been driving and starting great since

when it tries to start it does it like an old car with timing out.. so turns over and over faster and faster till it catches and runs ..the closer it gets to firing puffs of diesel can be seen coming from exhaust .difficult to describe.
Also i know nothing about diesels so can only describe what i see and say what garage says to me

[knobby1]

If the filter is not full it certainly sounds like air ingress after the filter which allows the fuel to drain out of the filter back to tank overnight under gravity. The filter heads are known to crack and let air in, also the fuel pipes which connect to the filter head have O-rings in their connectors which can perrish and leak....lots of possibilities worth checking.
When this happens, fuel rarely leaks out as the lines and filter aren't under pressure, they operate under a small vacuum, it normally just lets air in. Something to think about anyway.

Lord Knobrot

[maccavvy]

Thanks .

The filter housing is new..as is the filter
New leak off pipe and seals injector side.
It's a weird one for sure as it doesn't happen all the time.
He fitted new batteries and it started 1st time for 20 times
Then left it parked.came to it 2 hours later and it wouldn't start..till it turned over for ages.
I live on a hill and it parks face up..but was doing this outside jobs parked face down. So maybe nothing to do with that.

[bambi mk 1]

Question no 1 again have you tried it on easy start when it doesnt fire up The fuel filter IS never full when they are removed

[maccavvy]

nope... but doesnt explain lack of fuel pressure

[bambi mk 1]

nope... but doesnt explain lack of fuel pressure

You will have fack all fuel pressure if you have a dodgy ign switch A can of easy start £5 an ign switch £15 Sitting in the garage £sssssssssssss ,do the maths man

[maccavvy]

I'll pass the message on to the garage .
Too far away for me to pop and sort myself.
Going away for the weekend so not worrying about it for a few days.