Fuel rail pressure sensor removal?

GodStang · 10-18-2017, 10:43 AM

Hey my JBD fried my Fuel Rail Pressure sensor and I have one on the way. My question is does the 335d maintain pressure in the fuel rail even when car is turned off? If so how would one bleed the system to remove the sensor? Also I am guessing I will have to use Software to reprime the system once sensor is replaced? Any registering for the new sensor? Thanks in advance.

335stoner · 10-18-2017, 12:04 PM

you will need something to prime the system.. or hotwire the fuel pump if you know how to do so...

it doesn't look like there is a bleed screw of any sort.. first thing I would do is use something like torque app and see if there was any pressure in the system or use a handheld scan tool to check... if there was (me personally) I would crack a fuel line to one of the injectors just a little...

OmahaDZL · 10-18-2017, 01:51 PM

Quote:

Originally Posted by 335stoner

you will need something to prime the system.. or hotwire the fuel pump if you know how to do so...

it doesn't look like there is a bleed screw of any sort.. first thing I would do is use something like torque app and see if there was any pressure in the system or use a handheld scan tool to check... if there was (me personally) I would crack a fuel line to one of the injectors just a little...

When I have removed fuel lines I have never gotten a high pressure spray so I dont think it maintains the pressure...you should be good on removal...but, just in case you might want to loosen a line on top just for giggles.

335dsleeper · 10-18-2017, 06:33 PM

There's no pressure in the rail. Just unscrew the sensor.

You don't need to prime the fuel system as the lpfp won't push fuel past the hpfp. The only way to get fuel in the rail and up to pressure is by cranking the engine, since the hpfp has fuel, there's little to worry about.

Some crack the injector lines but, I never did as I didnt want it to make a huge mess on the engine.

GodStang · 10-18-2017, 07:36 PM

Thanks guys! You guys are awesome!

GodStang · 10-21-2017, 03:50 PM

Well replaced the sensor and now she cranks but won’t run. I have primed it and no luck. Getting code 4b90 and 4a6f.

335dsleeper · 10-21-2017, 04:38 PM

It’ll take a while to get it going. The prime only gets fuel to the hpfp. Takes a lot of cranking to get fuel to each injector.

Quote:

Originally Posted by GodStang

Well replaced the sensor and now she cranks but won’t run. I have primed it and no luck. Getting code 4b90 and 4a6f.

GodStang · 10-21-2017, 04:50 PM

Quote:

Originally Posted by 335dsleeper

It’ll take a while to get it going. The prime only gets fuel to the hpfp. Takes a lot of cranking to get fuel to each injector.

Alright can I hand/vacuum pump the air out? Did not see a shreader valve.

335dsleeper · 10-21-2017, 06:42 PM

Just put the car on a charger and keep cranking it. Some loosen the injector lines but, I don't want a diesel mess on top of the engine.

It'll take a bit to get it fired. Keep at it.

Quote:

Originally Posted by GodStang

Alright can I hand/vacuum pump the air out? Did not see a shreader valve.

Johnnybhoy7 · 07-29-2018, 03:38 PM

Resurrecting an old thread guys but getting fauld code 4340- Rail pressure control valve

Was that the code you had OP?

My cars not starting but it’s getting a good crank

13537805733 Is the corrrct part to solve the problem

GodStang · 08-14-2018, 06:33 AM

Quote:

Originally Posted by Johnnybhoy7

Resurrecting an old thread guys but getting fauld code 4340- Rail pressure control valve

Was that the code you had OP?

My cars not starting but it’s getting a good crank

13537805733 Is the corrrct part to solve the problem

Sorry usually on the facebook page and don't check here much. When I get home I will check what Codes I was getting I think I still have the Fault code file.

Pretty sure this is the one here. I bought a used one for a lot less:

https://www.autohausaz.com/pn/144625...SABEgJR1fD_BwE

logandeere · 10-04-2018, 06:33 AM

Quote:

Originally Posted by GodStang

Hey my JBD fried my Fuel Rail Pressure sensor and I have one on the way. My question is does the 335d maintain pressure in the fuel rail even when car is turned off? If so how would one bleed the system to remove the sensor? Also I am guessing I will have to use Software to reprime the system once sensor is replaced? Any registering for the new sensor? Thanks in advance.

Hey buddy old thread but I have the same exact problem can you show me where you bought it and possibly helpful things that will get me back up and running thanks!

apexit4 · 10-05-2018, 06:55 PM

Quote:

Originally Posted by logandeere

Hey buddy old thread but I have the same exact problem can you show me where you bought it and possibly helpful things that will get me back up and running thanks!

FYI, when I did my engine swap I didnt need to reprime the fuel system to get the car going. You should be able to get away with turning turning the ignition on and off to the accessories position a few times. That should be enough to prime the system and get you started.

Yozh · 10-05-2018, 10:57 PM

Turning ignition on and off only does a small squirt. You would be doing that hundred of times to prime. Suggest a proper prime with ISTA or other tools or jump the lpfp.

apexit4 · 10-06-2018, 11:42 AM

Quote:

Originally Posted by Yozh

Turning ignition on and off only does a small squirt. You would be doing that hundred of times to prime. Suggest a proper prime with ISTA or other tools or jump the lpfp.

If it was only a small squirt, then it was enough to get things going. The engine I put in had all fluids drained, including gas. When I put everything back together, I didn't do anything special for the fuel system. I cycled the ignition a few times and got the car started relatively quickly.

gr8whte · 10-06-2018, 03:13 PM

I've had to replace the high pressure fuel line to injector #6 and I couldn't get the car started until I put everything back together.
Unbolt the high pressure metal fuel line on cylinder #1.
With a hand vacuum pump connected to a reservoir to the fuel rail, pump out the air and crank the engine a few times.
You'll see a lot of air bubbles coming out with the fuel.
Pump as much air out as possible.
I did about 3-4 cranks.
Reconnect the hard fuel line back to the #1 injector.
It will take about 3-4 cranks until enough fuel pressure is generated.
Pain in the ass, but it was the only way I could get the car running.
Priming the LPFP does not work. It's only good for the Fuel Filter.

Trust me. It took me a week to figure it out. A trip to Harbor Freight for the vacuum pump and Advanced Auto to find a rubber elbow that would fit the rail connection.

10-18-2017, 10:43 AM	#1
GodStang Private 10 Rep 59 Posts Drives: 2011 BMW 335D Join Date: Jan 2017 Location: South Carolina iTrader: (0)	Fuel rail pressure sensor removal? Hey my JBD fried my Fuel Rail Pressure sensor and I have one on the way. My question is does the 335d maintain pressure in the fuel rail even when car is turned off? If so how would one bleed the system to remove the sensor? Also I am guessing I will have to use Software to reprime the system once sensor is replaced? Any registering for the new sensor? Thanks in advance.
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10-18-2017, 12:04 PM	#2
335stoner BRR tuned 220 Rep 646 Posts Drives: 335D black Join Date: Nov 2016 Location: cypress tx iTrader: (0)	you will need something to prime the system.. or hotwire the fuel pump if you know how to do so... it doesn't look like there is a bleed screw of any sort.. first thing I would do is use something like torque app and see if there was any pressure in the system or use a handheld scan tool to check... if there was (me personally) I would crack a fuel line to one of the injectors just a little...
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10-18-2017, 06:33 PM	#4
335dsleeper Banned 389 Rep 1,623 Posts Drives: 09' 335d 10'35D Join Date: Dec 2015 Location: Suffolk, va iTrader: (0)	There's no pressure in the rail. Just unscrew the sensor. You don't need to prime the fuel system as the lpfp won't push fuel past the hpfp. The only way to get fuel in the rail and up to pressure is by cranking the engine, since the hpfp has fuel, there's little to worry about. Some crack the injector lines but, I never did as I didnt want it to make a huge mess on the engine.
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10-18-2017, 07:36 PM	#5
GodStang Private 10 Rep 59 Posts Drives: 2011 BMW 335D Join Date: Jan 2017 Location: South Carolina iTrader: (0)	Thanks guys! You guys are awesome!
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07-29-2018, 03:38 PM	#10
Johnnybhoy7 Private First Class 19 Rep 169 Posts Drives: BMW E90 320D SE Join Date: Mar 2014 Location: Glasgow iTrader: (0)	Resurrecting an old thread guys but getting fauld code 4340- Rail pressure control valve Was that the code you had OP? My cars not starting but it’s getting a good crank 13537805733 Is the corrrct part to solve the problem
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10-21-2017, 03:50 PM	#6
GodStang Private 10 Rep 59 Posts Drives: 2011 BMW 335D Join Date: Jan 2017 Location: South Carolina iTrader: (0)	Well replaced the sensor and now she cranks but won’t run. I have primed it and no luck. Getting code 4b90 and 4a6f.
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10-05-2018, 10:57 PM	#14
Yozh Colonel 870 Rep 2,615 Posts Drives: 2011 335d M-Sport Join Date: Mar 2014 Location: Wet Coast iTrader: (4)	Turning ignition on and off only does a small squirt. You would be doing that hundred of times to prime. Suggest a proper prime with ISTA or other tools or jump the lpfp.
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10-06-2018, 03:13 PM	#16
gr8whte Enlisted Member 7 Rep 49 Posts Drives: 2011 335d Join Date: Oct 2014 Location: Sunrise FL iTrader: (0)	I've had to replace the high pressure fuel line to injector #6 and I couldn't get the car started until I put everything back together. Unbolt the high pressure metal fuel line on cylinder #1. With a hand vacuum pump connected to a reservoir to the fuel rail, pump out the air and crank the engine a few times. You'll see a lot of air bubbles coming out with the fuel. Pump as much air out as possible. I did about 3-4 cranks. Reconnect the hard fuel line back to the #1 injector. It will take about 3-4 cranks until enough fuel pressure is generated. Pain in the ass, but it was the only way I could get the car running. Priming the LPFP does not work. It's only good for the Fuel Filter. Trust me. It took me a week to figure it out. A trip to Harbor Freight for the vacuum pump and Advanced Auto to find a rubber elbow that would fit the rail connection.
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