Hi. Wondering if anyone has had this problem before. Its a ford fiesta,year 2015, 1.6tdci zetec s. 

The car will bump start and run fine until it comes down to idle speed,then cuts out. Turns over,with no intention of starting. But will bump start. There is no fault codes stored. 

I have no fuel pressure on parameter readings, no fuel up to injectors. I suspect its the high pressure pump.

What I'm not sure about is why I have no power to the injectors. Would these no get powered up as there's no fuel pressure! I've checked wiring between engine ecu and injectors,all checks out fine. 

Any help would be appreciated.

Are you using a generic code reader to check for fault codes ?

If it'll start with a bump it's generally low fuel pressure that's lacking.  As you suggest, injectors aren't fired until the PCM see's enough pressure on the high side - and a high enough cranking speed.

Would change the fuel filter first.  Then if that doesn't solve it, look for tiny leaks on the LP side that allow air in and fuel to leak back to the tank.  Would also make sure the battery & starter are able crank quickly enough (at least 200rpm iirc) as it'll clearly start when cranked more quickly.

How many miles has it done out of interest?  HP pumps aren't a common fault on this engine.

On 6/7/2022 at 10:32 PM, unofix said:

Are you using a generic code reader to check for fault codes ?

Snap on, no faults.

On 6/8/2022 at 9:17 AM, TomsFocus said:

If it'll start with a bump it's generally low fuel pressure that's lacking.  As you suggest, injectors aren't fired until the PCM see's enough pressure on the high side - and a high enough cranking speed.

Would change the fuel filter first.  Then if that doesn't solve it, look for tiny leaks on the LP side that allow air in and fuel to leak back to the tank.  Would also make sure the battery & starter are able crank quickly enough (at least 200rpm iirc) as it'll clearly start when cranked more quickly.

How many miles has it done out of interest?  HP pumps aren't a common fault on this engine.

Fuel filter been replaced, crank speed 297 rpm on parameter readings. I have very little fuel pressure on cranking. Hardly any fuel being delivered to injector. I suspect hp pump. As you've said. It's not common for these to fail. But I think I may be unlucky and it's the hp pressure pump at fault. I have also put a inline fuel primer to prime fuel up to fuel filter. 

5 minutes ago, Dai69 said:

Snap on, no faults.

A very good make is Snap-On, but like most non Ford general purpose code readers they are not so good on Ford specific DTC's

10 hours ago, Dai69 said:

Fuel filter been replaced, crank speed 297 rpm on parameter readings. I have very little fuel pressure on cranking. Hardly any fuel being delivered to injector. I suspect hp pump. As you've said. It's not common for these to fail. But I think I may be unlucky and it's the hp pressure pump at fault. I have also put a inline fuel primer to prime fuel up to fuel filter. 

The trouble there is, if the LP side has lost fuel, the HP pump will be sucking in air, which gets compressed easily so it then appears that there is low fuel pressure on the high side...when the reality is there's not enough fuel there to pressurise.  (Hope that makes sense!)  I'm not saying you're wrong, they do occasionally fail, just would want to rule out every other possibility before replacing the HP pump myself.

Have you checked or replaced the fuel pressure regulator on the pump at all? 

Bench tested the fuel pressure regulator. It operates on actuator test. 

With me hand priming the low pressure side and getting fuel to the pump, I would rule out a low pressure fault. Also priming while cranking, so there is definitely fuel delivery to the pump. 

I totally understand what your saying. But I think I've done ad much as possible to rule out low pressure side. 

3 minutes ago, Dai69 said:

Bench tested the fuel pressure regulator. It operates on actuator test. 

With me hand priming the low pressure side and getting fuel to the pump, I would rule out a low pressure fault. Also priming while cranking, so there is definitely fuel delivery to the pump. 

I totally understand what your saying. But I think I've done ad much as possible to rule out low pressure side. 

Fair point.  It looks like the pump is the next step then.  

I think so. I know these don't tend to fail. That's why I was wondering had someone else had some trouble before I go replacing the pump 

11 minutes ago, Dai69 said:

I think so. I know these don't tend to fail. That's why I was wondering had someone else had some trouble before I go replacing the pump 

The only other thing I can think of is the rail pressure sensor...has that been tested for accuracy?  Clutching at straws now maybe...  

Tried from another car. Still the same. 

Don't know if this will help, years ago I was replacing filter on a 2002 focus which wouldn't start after replacement. About to give up for the evening the setting sun reflected off the fuel pipe which the part that clipped into the filter was like a bakelite material I spotted a fine hairline fracture reflecting on the bakelite material. Had to change fuel pipe and everything worked fine after. Seems it was drawing in air caused the non start. 

On 6/15/2022 at 1:48 PM, Dai69 said:

Tried from another car. Still the same. 

Tonight I replaced the diesel pump. Still won't start. Still no fuel pressure readings on cranking. Checked wiring from fuel pressure sensor to engine ecu. No problem there. Bled the fuel through on a hand primer to make sure fuel up at filter,still no joy. 

9 hours ago, Dai69 said:

Tonight I replaced the diesel pump. Still won't start. Still no fuel pressure readings on cranking. Checked wiring from fuel pressure sensor to engine ecu. No problem there. Bled the fuel through on a hand primer to make sure fuel up at filter,still no joy. 

How frustrating.  

Are you absolutely sure all air was bled from the high side?  Does it still run after a bump?  Filling the filter is only half the job.  I wouldn't normally recommend this on CR engines but it might be worth cracking off one of the rail pipes while cranking to make sure there's not a massive airlock stuck in the rail.  

Did it run ok when it was running?  I'm just wondering if there's a faulty injector that's leaking off far too much fuel and preventing the rail maintaining pressure at low pump speeds.

Could it be a bad injector releasing all the pressurized fuel back into the fuel return line ? 

On 6/18/2022 at 9:31 AM, TomsFocus said:

How frustrating.  

Are you absolutely sure all air was bled from the high side?  Does it still run after a bump?  Filling the filter is only half the job.  I wouldn't normally recommend this on CR engines but it might be worth cracking off one of the rail pipes while cranking to make sure there's not a massive airlock stuck in the rail.  

Did it run ok when it was running?  I'm just wondering if there's a faulty injector that's leaking off far too much fuel and preventing the rail maintaining pressure at low pump speeds.

Still no fuel coming up to the injectors. Primed fuel up using hand pump, there's fuel delivery up to the pump. I still have no fuel pressure reading on parameter readings while cranking. I haven't tried bumping since fitting pump

14 minutes ago, Dai69 said:

Still no fuel coming up to the injectors. Primed fuel up using hand pump, there's fuel delivery up to the pump. I still have no fuel pressure reading on parameter readings while cranking. I haven't tried bumping since fitting pump

I can't understand where the fuel's going if it comes up to the pump but there's nothing at all in the rail? 

Have you taken the main 'out' pipe off of the pump to check that it is moving fuel through there when cranking?  (Obviously take care to keep hands and eyes well away!)

As I mentioned above, it'll take a fair amount of cranking to refill the high pressure side since it's been opened, but if there's no fuel reaching the rail at all then more cranking won't help.

 

Sounds very much like my old deisel focus which had similar fuel filter. Couldn't get it to start again. As fuel was coming up and out of the filter but not reaching the injectors the problem obviously was between filter and injectors, either a blockage in the pipes or a duff filter. New fuel pipe from filter to injectors solved the problem. 

Fitting another fuel pump, does that not need coded to the ecu.