Fuel rail pressure sensor replacement

[Fritters77]

2013 glx-r ..Ute went into limp mode and wouldn’t start error code was p0191Fuel rail pressure sensor...
Has anyone replaced there’s and did you use a genuine Mitsubishi or after market ...
Also when replacing how long did you wait to make sure there was no pressure before unscrewing..
Thanks in advance.

[NowForThe5th]

https://www.newtriton.net/phpbb/viewtopic.php?f=38&t=21266&p=548207&hilit=fuel+rail+pressure+sensor#p548207

[Fritters77]

thanks for that I did read through that thread already .I dont think mine is leaking .
I’ve been told by my mechanic to go the genuine one instead of aftermarket hoping someone could shed some light on what option they went.....

[aids84]

I don't think you'll be able to get one from Mitsubishi seperate to the rail. They sell the rail,sensor and limiter as an assembly. Replacing the rail usually means you should change the feed and injector pipes as well.

Rail pressure drops away pretty quickly once the engine is stopped, give it 30 seconds and you'll be fine.

Don't think I ever recall replacing a rail on a Mitsubishi in 9 years in the workshop at a dealer. I'd be making sure it's not the suction control valve or a dodgy injector throwing the code before putting a new rail on it.

http://faq.out-club.ru/download/l200_20 ... dex_M1.htm

[Fritters77]

Yeah I’m not 100% sold on the rail sensor ...
The car only has 80k on the clock wouldn’t think it would go so early ...
Haven’t changed the scv but wouldn’t think that would go with little kms either...
The car is blowing abit of black smoke too when I give it some stick, which I guess could be injectors ...

I have had the manifold /EGR pulled off and cleaned to try and get rid of the black smoke....

[aids84]

You can generally identify a dodgy injector by looking at the learned SQL values in the ECU data (will need a decent scantool to see this data) They should all be roughly the same over the 5 or 6 different learnt values. Any injector that varies greatly from the rest is probably giving you drama.

If the injector is far enough gone it can cause rail pressure codes to be logged as too much fuel is being lost out the injector fuel return, and the SCV can't keep up with the varying pressure.

On some engines you can physically check this as the individual returns are able to be taken off and measured, sadly with the Triton all the returns go into a common pipe under the rocker cover, so can't be accessed while the engine is running.

[Fritters77]

Thanks heaps for your help,
Is there a chance that the SCV is faulty causing the black smoke and the rail pressure sensor to throw a code...

[aids84]

Yes I would say that the SCV is probably the most common cause of fuel pressure codes and running issues.

They are easy enough to change and not too expensive, i'd be changing that first before replacing any more expensive components.

[Fritters77]

Yep I think that’s a good start ...
I’ll order one tonight...
Appreciate your help...