recently bought a 2006 smax 2.0tdci and the first day I had it it drove fine, left it over night on an incline with front facing up went to start it in the morning and it fired up then cut out and wouldnââ,¬â,,¢t start again.
called rac out they plugged it in code came up p00087 fuel pressure control valve, he told me it was a generic code and that the issue was most likely the in tank electric fuel pump/sender as no fuel was coming up. Since then I have replaced the electric pump and the fuel pressure regulator but the car still wonââ,¬â,,¢t fire up no fuel is coming up from the tank. My mechanic is now saying the code says about low pressure at the fuel pressure rail, ive order a new fuel rail sensor but need to know if there could be anything else causing the issue?
all fuses have been checked, in tank pump replaced and regulator replaced. My mechanic doesnââ,¬â,,¢t think itââ,¬â,,¢s the actual high pressure pump.
He has said a code for bcm came up but didnââ,¬â,,¢t say which code. Could a faulty bcm stop the in tank pump from working?
Any help would be greatly appreciated
It could, the BCM typically powers all your electrical circuits such as lights and locks but would likely include the in-tank pump but BCM failure is reasonably rare.
If no fuel is being pushed out of the tank then it can't be the high pressure pump! Fuel rail sensor also isn't going to be your issue I'm afraid, ignore the codes for the minute and start with the basics:
1) Obvious but, there is actually fuel in it? Pop a Gerry can's worth in if there is any doubt.
2) The in-tank pump - have you checked it's now working? Can you hear it? If not get the multi meter out and measure the voltage to make sure its get 12v. It will be fused and likely relay driven so making sure its got a supply and a ground are the first things to check if you suspect there is an issue with that pump.
3) Assuming it is working, next would be to look for a blockage between the pump and the rail. I don't recall the S-Max setup but its likely to have a fuel filter so when was that last changed?
Hi thanks for your reply, my mechanic has said that the new pump just isnââ,¬â,,¢t working if you take the fuel line off from the tank to the fuel filter housing and crank the engine no fuel comes up. It has just over quarter of a tank in it.
I did notice that the front n rear washer jets have stopped working and the front wiper only works on 1 setting now and the rear wiper doesnââ,¬â,,¢t work at all and yet they did before which makes me think bcm again.
With the faults you have it could well be BCM related but equally could be a relay at fault so a supply is missing from BCM input.
I think you are in to wiring diagram territory now to check supplies and outputs,has he probed fuel pump wiring to confirm if 12v exists at the plug?
Quote from: johnnyroper on September 24, 2020, 04:03:21 PM
With the faults you have it could well be BCM related but equally could be a relay at fault so a supply is missing from BCM input.
I think you are in to wiring diagram territory now to check supplies and outputs,has he probed fuel pump wiring to confirm if 12v exists at the plug?
Hi thanks for your reply, Iââ,¬â,,¢m not sure if he has probed the in tank pump itself but I will ask. I know has has tested every fuse and relay and they are all working. Iââ,¬â,,¢ve looked at the exploded view of the fuse boxes but canââ,¬â,,¢t find the fuel pump relay just the fuse
Slightly strange way of doing things tbh. If you suspect an electric part is failed the first to do is check the supply!
I would make that no1 on the list of things to ascertain! Although next step after that (if there is no supply) is to check fuses and relays so he may have already done it.
Could also direct feed 12v into the motor to check it works and also send some fuel up to the filter.
Can anyone tell me if these diesel systems need priming or does the electric lift pump self prime? The clear fuel lines are dry
Typically on modern common rails the electric pump will prime it enough to purge the fuel through and allow starting,there are no priming bulbs like on diesels of old. On some though I have had to crack a pipe off from filter to HP pump and cycle electric pump and then crack injector pipe slightly and crank engine to bleed pipework in order to get engine going without excessive cranking over
If the lines have no fuel in them then you have a pump thatââ,¬â,,¢s not working or an issue with pick up/blockage in pipework or not enough fuel in the tank.
Quote from: johnnyroper on September 27, 2020, 07:15:00 AM
Typically on modern common rails the electric pump will prime it enough to purge the fuel through and allow starting,there are no priming bulbs like on diesels of old. On some though I have had to crack a pipe off from filter to HP pump and cycle electric pump and then crack injector pipe slightly and crank engine to bleed pipework in order to get engine going without excessive cranking over
If the lines have no fuel in them then you have a pump thatââ,¬â,,¢s not working or an issue with pick up/blockage in pipework or not enough fuel in the tank.
Thatââ,¬â,,¢s what I thought, the rac managed to get fuel up from the tank when this first happened so donââ,¬â,,¢t think there is a blockage. My mechanic changed the pump but just keeps saying itââ,¬â,,¢s not working it has just over quarter of a tank do you think it could need more in it? I donââ,¬â,,¢t think he has tried hand priming it
When he says itââ,¬â,,¢s not working does he mean it does not run or it does not bring fuel up from tank?
The electric pump will certainly bring fuel up to filter so itââ,¬â,,¢s visible in the low pressure clear lines
Quote from: johnnyroper on September 27, 2020, 06:33:14 PM
When he says itââ,¬â,,¢s not working does he mean it does not run or it does not bring fuel up from tank?
Iââ,¬â,,¢m not sure I havenââ,¬â,,¢t been able to speak to him over the weekend but last thing he said to me was itââ,¬â,,¢s not working even after fitting the new one but doesnââ,¬â,,¢t know why.
Quote from: johnnyroper on September 27, 2020, 06:54:44 PM
The electric pump will certainly bring fuel up to filter so itââ,¬â,,¢s visible in the low pressure clear lines
Yeh there is nothing in the clear lines I wasnââ,¬â,,¢t sure if it needed priming as there is nothing in the system
He really needs to check for voltage at pump now he should have done it first really. Without knowing if thereââ,¬â,,¢s power and if pump is running but not supplying or just not running he is just taking a stab in the dark.
Clearly the pump is not drawing fuel out the tank just need to know why.