low pressure in rail help plz

[leonwayne1988]

hdi wont reech reqired pressure to fire
ive replaced th hp pump with another 330d one put that one on still no diff replaced brown relay new bosch canister/filter im gettin on my snap on modis live data fuel when not cranking is 8/16 bar i thought that should be zero
when crankin it reches 98 bar lp pump new wat else could it be once started with brake cleaner it will tick over for days and rev soon as you put it in gear go relly slow fine soon as it boost up it cuts out any one in somerset that can help pay of course

[cully]

maybe the fuel pressure sensor is screwy especaly if its not reading zero

but it might read pressure when not cranking as the tank pump would have primed the system!

maybe injectors excesive leakage not letting the pump get to pressure
maybe FPR not seating/lifting controlling the pressure

[Jonny81191]

I'd start with a leak off test and also check/swap for known good the fuel pressure sensor and regulator, as Cully suggests.

[Poodle]

The lift pump shouldn't provide more than 3.2bar, if it's showing 8-16 without cranking i'd be inclined to start with the fuel rail pressure sensor. It's also worth checking the connections at the sensor plug, the yellow plug lower down the block and the brown relay, and for continuity between the three.

[leonwayne1988]

cheers guys new sensor here tomoz if not then shes proberbly off to hicklys bosch specilist be hell of a bill thou but then ive spent best part of 300£ allready soon as we put a new hp pump in her she started and was fine for the night but hay ho it cut out next day and it started after 3/4 cranks drive it cuts out but now its more like 100 cranks and brake cleaner lol hope the part sorts it out lol

[leonwayne1988]

still no joy new sensor reading zero now but wat if injectors are stuck open could that be a possibility if so where can i sorce amg nozzels from as thats wats in it at mo or whould it run on standerd hdi ones cheers

[Tom]

I swear someone said the amg nozzles are the wrong angle and are crap?

[Poodle]

Not being funny dude, but could you try out some punctuation or something? Just a couple of full stops here and there would help make it easier to read.

Injectors can't stick open on these engines. AMG nozzles aren't great, but they'll do the job, will need to source them from a bosch/diesel specialist.

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What pressure does it show when the lp pump is running? And when cranking?

[leonwayne1988]

6bar lp crankin its 77 bar the pump has been replaced still no joy lol

[Poodle]

You should have ~3bar with ignition and ~280 while cranking, either the new sensor is dodgy or there's something else going on. You said the sensor wasn't reading before, what did you change for it to start reading pressures?

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Sorry if i'm insulting your intelligence here, but have you just bolted amg injectors in and expected it to run..?

[leonwayne1988]

oh no they were in when i purchesed the car it was remapped by pro steve we put a new 330dhp pump in as there was metel in filter we then fired it and started next day cut out again im thinking some metel has gone to the injectors or sumthing me and my mate are confused might just give up and buy some thing else lol hes gona do a leak off test asap lol cheers

[DeeTurbo]

Cully, aren't the FPR different in some way on the 330 pump?

Leon, were about are you based?

[cully]

Cully, aren't the FPR different in some way on the 330 pump?

Leon, were about are you based?

ummm i don't know

[Poodle]

But the filter is pre-hp pump, metal filings in there is said to be a sign of the lift pump going, not the hp pump.

If you've opened the filter housing and not flushed out any crap in there before reassembly, then the chances are you've just let all the crap through to the injectors, so that could well be your problem. Or at least that's if i've understood you right, the lack of sentence structure is making it fairly hard to decipher what you're saying.

[DeeTurbo]

Cully, aren't the FPR different in some way on the 330 pump?

Leon, were about are you based?

ummm i don't know

I can't remember if you had to mod the FPR or the third piston thingy on the 330 pumps but I think the 2.2 pumps are a straight swap.

[leonwayne1988]

yea thats right cause the third piston shut off is been desabled and there is now a spare wire and im in taunton somerset cheers

[leonwayne1988]

can ya help cully lol ur not far from me il pay of course

[leonwayne1988]

one of you guys must no someone in around the the somerset area that work with the hdi lump pug in taunton wont touch it lol

[Poodle]

Have you tried checking the connections suggested? How did you get on with the leak-off test?

The link in my sig might give you some more clues.

[welshpug]

surely this is quite a simple problem.

ECU said pressure is low.

either A - RAISE PRESSURE.

or B - REPLACE SENSOR.

[cully]

is the fpr connected on the HP pump?

is the battery good as if the ECU sees low voltage even at cranking it wont fire the injectors at all

im on call till monday then on lates so won't be able to help anytime soon sorry

[leonwayne1988]

yea had new batt the fpr is connected we had to remove the fpr from old pump as the new 330 d fpr was different but that shouldent make a difference should it oh i did have a problem couple mts bk running like lumpy and it was the connection to injector 4 the wire had snaped. i ave thought about replacing the loom but it started after fitiing new the new pump so thought cant be that.
cully when are you gonna be avalible cant i just call you out trough ur work lol theres no sort of rush but i want to be out in her lol cheers

[cully]

cant i just call you out trough ur work lol

umm NO your not a hospital i cover!

[leonwayne1988]

oh sorry lol thought you might of been a meaganic do u no any one around devon/somerset that are clued up on these engines sorry pal lol

[cully]

electro diesel in exeter are good but it wether they will touch a none std none runner

[leonwayne1988]

yea thats the prob there aint many that will touch it i think thats why my m8 is a bit lost hes a so called mecanic but he aint got a clue on this one lol

[Poodle]

Have you tried checking the connections suggested? How did you get on with the leak-off test?

The link in my sig might give you some more clues.

[leonwayne1988]

no we not done leak off test yet cant you come poodle ave a look il pay you and your fuel cost and buy you some beer got all the tools required lol

[Poodle]

Depends how long you want to wait, i've not got much free time until the first week of February lol.

From what you've said about the loom, i reckon it's worth checking out that - just go over anything fuel related and check for continuity.

[leonwayne1988]

yea sound il ave a look the week end but to be honest she been sat now for 2mts so another month aint gona hurt il let you no thou i might just source a new loom and fpr as that the only thing that aint been changed lol cheers

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any one wanna buy it as it is or swap for a runner its a bloddy headach lol