Non starter and now fuel rail problem
#1
03-10-2018, 11:27 AM
Non starter and now fuel rail problem
For the past month my XJ Executive has refused to start.
Taking advice from previous posts I have so far changed:
1. The battery
2. The spark plugs (at the same time noticed oil on one so replaced the rocker and valve gaskets)
3. The coils
4. The crankshaft sensor.
she always seemes on the brink of catching without actually getting there.
So today focused on the fuel. I thought I could hear the fuel pump and had changed over the relay in the boot. I decided to open one of the nuts on the right hand end of the fuel rail but this moved the whole pipe and she developed a small leak under the “dome” next to the nut that goes to the rail. When I turned the key this developed into a nice spray of fuel. I am assuming this has proved it’s not the fuel pump.
So:
1. Is there a way of sealing this leak or do I now need to replace the fuel rail?
2. What else could it be that is stopping her starting?
Taking advice from previous posts I have so far changed:
1. The battery
2. The spark plugs (at the same time noticed oil on one so replaced the rocker and valve gaskets)
3. The coils
4. The crankshaft sensor.
she always seemes on the brink of catching without actually getting there.
So today focused on the fuel. I thought I could hear the fuel pump and had changed over the relay in the boot. I decided to open one of the nuts on the right hand end of the fuel rail but this moved the whole pipe and she developed a small leak under the “dome” next to the nut that goes to the rail. When I turned the key this developed into a nice spray of fuel. I am assuming this has proved it’s not the fuel pump.
So:
1. Is there a way of sealing this leak or do I now need to replace the fuel rail?
2. What else could it be that is stopping her starting?
#2
03-10-2018, 12:00 PM
Veteran Member
First things first in to resolve the fuel leak . I don't have any reseal options other then to inspect the mating surfaces and maybe sand them down with some fine sandpaper . Someone else may have some better recommendations .
Do you see the tachometer respond as you may have a problem with the crankshaft sensor which also controls the fuel pump to stay on after it sees engine rotation and the ignition and fuel injector timing . Do you get a brief light off and then stall ? The camshaft sensor is used in the start sequence and then shifts over to the crankshaft which may be at fault . The crankshaft sensor can fail in some aspects of its usage like the fuel pump for the duration of the run after the 3-5 second on then off priming of the fuel rail as you first turn the key . You can jumper the fuel pump to run at all time and bypass the control of this relay .
Some have pinched of the RPR return line ifs the FPR is bypassing and causing the regulated pressure to be too low .
Crankshaft sensor connector cleaning including the ECU connectors ?
Do you see the tachometer respond as you may have a problem with the crankshaft sensor which also controls the fuel pump to stay on after it sees engine rotation and the ignition and fuel injector timing . Do you get a brief light off and then stall ? The camshaft sensor is used in the start sequence and then shifts over to the crankshaft which may be at fault . The crankshaft sensor can fail in some aspects of its usage like the fuel pump for the duration of the run after the 3-5 second on then off priming of the fuel rail as you first turn the key . You can jumper the fuel pump to run at all time and bypass the control of this relay .
Some have pinched of the RPR return line ifs the FPR is bypassing and causing the regulated pressure to be too low .
Crankshaft sensor connector cleaning including the ECU connectors ?
Last edited by Lady Penelope; 03-10-2018 at 12:03 PM.
#3
03-10-2018, 12:19 PM
#4
03-10-2018, 12:31 PM
Veteran Member
First things first on the fuel leak . Someone may have more suggestions for you .
One thing to keep it mind is the ECU will die as you get below 11.5 volts or so in the heat of battle . And you may have pushed the engine into a cylinders fuel wash of the unburned fuel depleting the oil film seal for enough compression for a start . That can be resolved by pushing the pedal all the way down as this cuts of the fuel injectors so some oil from the bottom of the piston can be brought up to reestablish the seal .
Put your finger on the fuel pump relay and feel for it to click 3 times as the first 2 are the on then off for the initial fuel rail prime and the 3rd is the back of after the crankshaft sensor sees rotation . If not getting the 3rd the relay can be jumperd .
One thing to keep it mind is the ECU will die as you get below 11.5 volts or so in the heat of battle . And you may have pushed the engine into a cylinders fuel wash of the unburned fuel depleting the oil film seal for enough compression for a start . That can be resolved by pushing the pedal all the way down as this cuts of the fuel injectors so some oil from the bottom of the piston can be brought up to reestablish the seal .
Put your finger on the fuel pump relay and feel for it to click 3 times as the first 2 are the on then off for the initial fuel rail prime and the 3rd is the back of after the crankshaft sensor sees rotation . If not getting the 3rd the relay can be jumperd .
Last edited by Lady Penelope; 03-10-2018 at 12:41 PM.
The following users liked this post:
Huntingdon (03-10-2018)
#6
03-10-2018, 01:52 PM
Veteran Member
The following users liked this post:
Huntingdon (03-10-2018)
#7
03-11-2018, 03:40 AM
Veteran Member
I would replace the fuel rail first for the peace of mind. Hopefully you can find a good used one from the breakers.
If your no-start problem continues but you are sure the CPS, battery, coil and spark plugs, grounding points, starter motor, fuses and relays are all good, it could be a cam position sensor or poor connection issue. I find this X300's no-start checklist very useful. Good luck!
If your no-start problem continues but you are sure the CPS, battery, coil and spark plugs, grounding points, starter motor, fuses and relays are all good, it could be a cam position sensor or poor connection issue. I find this X300's no-start checklist very useful. Good luck!
The following users liked this post:
Lady Penelope (03-11-2018)
Thread
Thread Starter
Forum
Replies
Last Post
iconic
XJ XJ6 / XJR6 ( X300 )
9
06-01-2016 11:44 AM
xstatic
S-Type / S type R Supercharged V8 ( X200 )
23
07-28-2014 09:14 PM
Jagalicious
XJS ( X27 )
15
06-19-2013 08:54 PM
Turbo_dash
XJ XJ6 / XJR6 ( X300 )
2
10-09-2012 06:28 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)