Breakdown - P0191 Fuel Rail Pressure Sensor

**BradC** · 6th January 2020, 09:37 PM

Originally Posted by shamirj

got the new sensor for the fuel pressure line and fitted which made no difference, still will not start. cranks but does not start.

thinking now it has to be either of the two fuel pumps, either the cheaper pump in the fuel tank, or the more expensive pump in rear of engine. the HPFP belt could also be snapped but unlikely to me.

upon ignition on, there is no fuel pump noise or any evidence the pump is actually pumping fuel through the system, my guess is that is the role of the LPFP in the tank? based on this i think it might be the in tank fuel pump that has died.

upon further investigation with my code reader, the fuel pressure in the rail was found to be 'high' which kinda doesn't make sense to me if the pump is dead. Could there be some other explanation as to how could the system have higher then normal readings for the pressure in the fuel lines. This was the code read from the hand held car reader. looks to be a tow to the mechanic to sort out as i have no idea.

Have someone depress the valve on the schrader in the engine bay and turn the key on. You should get 20(ish) seconds of good diesel flow if the low pressure pump is working at all.
There is a fuse and relay for it in the engine bay fusebox, but I can't help much further than that as I have D3. The wiring diagram is pretty straightforward though.

If you don't get fuel then I'd be looking at bypassing the fuse & relay with a jumper wire as a check first. Could also be the connector or associated wiring harness. I've heard of one that even had a rat chew the harness, but that manifested issues with the fuel gauge as well.

You can get a high pressure code if the PCV jams closed. A sticky PCV is one of the reasons for HPFP failure, although sticking open (low pressure) seems to be more common. I manually generated a high pressure code by jamming the PCV closed with a battery while testing. I got the engine running but it didn't like it much. Probably not one of the brightest things I've done. It did show the valve was working though.

If you have the 2.7 V6 I'd have thought you should be able to crack the top of the belt cover and have a look in with a mirror or have a feel about. That'd tell you if it was the belt that went. The fact you said you had fuel while it was cranking (even though it wasn't a lot) might indicate otherwise though.

**shamirj** · 7th January 2020, 04:43 PM

assessment has come in, fuel contamination...

**BradC** · 7th January 2020, 04:50 PM

Originally Posted by shamirj

assessment has come in, fuel contamination...

So HPFP and potentially injectors?

**theelms66** · 7th January 2020, 09:31 PM

MMM with what?

**shamirj** · 8th January 2020, 05:35 PM

fuel came back very cloudy diesel. off to the experts to have the sample of fuel tested, lodged an insurance claim and still with the mechanics doing a full report on whats needed to be fixed incl but not limited to two fuel pumps and injectors as a minimum. just have to wait it out now. positives are will be a great tourer once more with two new fuel pumps, my timing belts were due anyway so will get them to do the rear belt as they do the pump. funny thing was the exact same thing happened to a mate with a RRS and they replaced his HPFP which he later sold and replaced with an Audi 4wd which i think he regrets now. he had 10yrs with his rangie no problems.

**shamirj** · 24th January 2020, 08:59 AM

insurance company had fuel tested and yes its common to have contaminated fuel in sydney according to the insurance assessor.
approval rec'd for works to be carried out including the following; total cost of repairs $17500 of which approx $3000 is labour costs.
items replaced include fuel injectors 6k, fuel pipes, fuel rails either side 1k, HPFP over 2k, timing belt rear, tank fuel pump $600. Parts come in at over 12k. big job to complete and will be getting the front timing belt done at my cost. now the wait till the car returns home. Looking forward to getting my LR back. Never experienced fuel contamination before only ever heard of this in the bush with older petrol stations or older tanks. I think there was also talk from the assessor to write off the vehicle but thank the lord we have approval for the repairs instead.

**INter674** · 24th January 2020, 09:15 AM

OMG is there any way of tracing the supplier...they should be made to pay! !

Fuel in Aus is a total rip off without this sort of crap outcome on top😐

And....How do avoid it happening again?

**letherm** · 24th January 2020, 08:50 PM

Originally Posted by shamirj

insurance company had fuel tested and yes its common to have contaminated fuel in sydney according to the insurance assessor.
approval rec'd for works to be carried out including the following; total cost of repairs $17500 of which approx $3000 is labour costs.
items replaced include fuel injectors 6k, fuel pipes, fuel rails either side 1k, HPFP over 2k, timing belt rear, tank fuel pump $600. Parts come in at over 12k. big job to complete and will be getting the front timing belt done at my cost. now the wait till the car returns home. Looking forward to getting my LR back. Never experienced fuel contamination before only ever heard of this in the bush with older petrol stations or older tanks. I think there was also talk from the assessor to write off the vehicle but thank the lord we have approval for the repairs instead.

Obviously without naming and shaming but which suburb or area did you buy the fuel from?

Martin

**DiscoJeffster** · 24th January 2020, 10:15 PM

Originally Posted by letherm

Obviously without naming and shaming but which suburb or area did you buy the fuel from?

Martin

What’s the relevance?

**RANDLOVER** · 25th January 2020, 02:20 AM

Originally Posted by BradC

Yep. Not saying I recommend the practice, and it did set a fault code (although no visible indication of it) when I really planted the boot, but I drove it around the block a couple of times with the LPFP fuse out while monitoring the pressures at the schraeder (not surprisingly a fairly good vacuum when getting the right boot down)…………..

…………………………….
All that is to say that provided you have fuel in the tank and a relatively clear filter, a non-functional LPFP should not be the cause of a no-start.
[/LEFT]

Brad Looks like your theory has been proven correct in real world circumstances.

Originally Posted by vbrab

……………………………..

Originally Posted by vbrab

The other occasion was most recently when the in tank pump failed, but we were still able to roll along at 70kph for 250k's on the injector pump pulling enough fuel to get us to Kalgoorlie...…….

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