XJ XJ8 / XJR ( X308 ) 1997 - 2003

'02 XJ Sport- No fuel pressure

 
  #1  
Old 01-26-2019, 10:30 AM
Z07Brandon's Avatar
Senior Member
Thread Starter
Join Date: Jun 2017
Location: Dallas, Tx
Posts: 517
Received 41 Likes on 36 Posts
Default '02 XJ Sport- No fuel pressure

Car starts and dies immediately, runs bad the few seconds it runs.

Fuel pressure: Zero psi. Verified by pushing on the pintle with a pick. Very very little fuel pressure shot out. And of course, fuel pressure gauge read zero.

Relay: Swithed the license plate/side marker relay with the fuel pump. Still zero psi. License plate still works, so that verifies relay is good.

Fuse: Number 7 Fuse in the trunk. Didn't light up using my testlight. Yes the testlight works. Took the fuse out. Looks good to me.



Conclusion: bad fuel pump? For what it worth, I do hear the rail prime. But only the smallest amount of fuel comes out when pushing on the fuel pintle.
 
  #2  
Old 01-26-2019, 10:46 AM
Lady Penelope's Avatar
Veteran Member
Join Date: Apr 2017
Location: Kansas City USA
Posts: 3,776
Received 1,214 Likes on 966 Posts
Default

Is the yellow fuse 30 amp ?

Check fuse # 16 / 10 amp LH heelboard fuse box . This closes the relay

The FP relay will click on for 4 seconds then click off by design , it will click a 3rd time on when the ECU sees engine rotation




hjs controls the relay
 

Last edited by Lady Penelope; 01-26-2019 at 10:58 AM.
  #3  
Old 01-26-2019, 11:02 AM
Z07Brandon's Avatar
Senior Member
Thread Starter
Join Date: Jun 2017
Location: Dallas, Tx
Posts: 517
Received 41 Likes on 36 Posts
Default

Just checked that relay, it is good.
 
  #4  
Old 01-26-2019, 11:21 AM
Lady Penelope's Avatar
Veteran Member
Join Date: Apr 2017
Location: Kansas City USA
Posts: 3,776
Received 1,214 Likes on 966 Posts
Default

caalapsed fuel filter ?

Have you put your finger on the pump relay to feel it click

Even though it may click do you have the 2nd pump relay to swap "

Check the pumps connector for burnt pins

Some XJ8s have a noise suppressor in the pump connector wires
 

Last edited by Lady Penelope; 01-26-2019 at 11:39 AM.
  #5  
Old 01-26-2019, 02:09 PM
Z07Brandon's Avatar
Senior Member
Thread Starter
Join Date: Jun 2017
Location: Dallas, Tx
Posts: 517
Received 41 Likes on 36 Posts
Default

I'll check that when I get back home later,today. Thanks!
 
  #6  
Old 01-26-2019, 03:51 PM
Join Date: Dec 2009
Location: Decatur,TX
Posts: 7,867
Received 4,126 Likes on 2,703 Posts
Default

If your car has about 100,000 miles on it, then the pump is likely DEAD!!!!!!!!!!!!!
The pumps seem to last about 100K miles on average.

Plenty of info on fuel pump replacement.

bob
 
The following users liked this post:
Don B (02-05-2019)
  #7  
Old 01-26-2019, 04:21 PM
Z07Brandon's Avatar
Senior Member
Thread Starter
Join Date: Jun 2017
Location: Dallas, Tx
Posts: 517
Received 41 Likes on 36 Posts
Default

It has 120k miles. Based on the history, the pump was replaced about 3 years ago. But yeah I definitely need to check for burnt pins. If all checks out, what pump do you guys recommend?
 
  #8  
Old 01-26-2019, 08:27 PM
M. Stojanovic's Avatar
Senior Member
Join Date: May 2017
Location: Kuala Lumpur
Posts: 535
Received 279 Likes on 209 Posts
Default

You can do a simple test to check the pump. On the attached picture, the relay pin marking in red is the Jaguar marking, in black is the standard marking. Take the pump relay out and verify that you have 12V present in the socket for pin 3 (30). It is better to test it with a bulb, connected between pin 3 and ground. If this is ok, use two short wires, each with a spade connector at one end, and plug them into relay sockets for pins 3 (30) and 5 (87). Keep the 20A fuse in. With a fuel pressure gauge connected, tie the free ends of the two wires in the relay socket together and see whether you are getting good fuel pressure or not.

 
The following 3 users liked this post by M. Stojanovic:
Don B (02-05-2019), Lady Penelope (01-26-2019), motorcarman (01-27-2019)
  #9  
Old 01-26-2019, 09:13 PM
Lady Penelope's Avatar
Veteran Member
Join Date: Apr 2017
Location: Kansas City USA
Posts: 3,776
Received 1,214 Likes on 966 Posts
Default

You can drive the car around this way but as you exit the car will stay on and drain the battery
 
  #10  
Old 01-27-2019, 11:04 PM
Z07Brandon's Avatar
Senior Member
Thread Starter
Join Date: Jun 2017
Location: Dallas, Tx
Posts: 517
Received 41 Likes on 36 Posts
Default

Originally Posted by M. Stojanovic View Post
You can do a simple test to check the pump. On the attached picture, the relay pin marking in red is the Jaguar marking, in black is the standard marking. Take the pump relay out and verify that you have 12V present in the socket for pin 3 (30). It is better to test it with a bulb, connected between pin 3 and ground. If this is ok, use two short wires, each with a spade connector at one end, and plug them into relay sockets for pins 3 (30) and 5 (87). Keep the 20A fuse in. With a fuel pressure gauge connected, tie the free ends of the two wires in the relay socket together and see whether you are getting good fuel pressure or not.
Using a test light, it did light up on the 86 terminal. I do know the pump is getting power. I removed the fuel cap, put my ear in the fuel fill hole. Had my mom turn the key to ON position. Heard the pump pretty clear actually. It just makes the smallest amount of pressure.
 
  #11  
Old 01-28-2019, 02:57 AM
M. Stojanovic's Avatar
Senior Member
Join Date: May 2017
Location: Kuala Lumpur
Posts: 535
Received 279 Likes on 209 Posts
Default

Originally Posted by Z07Brandon View Post
Using a test light, it did light up on the 86 terminal. I do know the pump is getting power. I removed the fuel cap, put my ear in the fuel fill hole. Had my mom turn the key to ON position. Heard the pump pretty clear actually. It just makes the smallest amount of pressure.
The socket for pin 86 gets power with the ignition "on", the socket for pin 30 should have power all the time. If you bridge socket 30 to socket 87, you do not need to switch the ignition at all. This will run the pump continuously (as compared to a few seconds with the ignition on) and give you more time to listen and also see if you get better pressure after a bit longer pump run. The commutator of the pump motor (the copper segments on which the motor brushes rest) can get gummed up, from long sitting, and cause the pump to run at much reduced rpm. It is worth trying with letting the pump run for a longer time which may clear the commutator and restore the pump speed.
 
The following users liked this post:
NEECAPR (02-01-2019)
  #12  
Old 02-02-2019, 12:26 PM
Z07Brandon's Avatar
Senior Member
Thread Starter
Join Date: Jun 2017
Location: Dallas, Tx
Posts: 517
Received 41 Likes on 36 Posts
Default



Ok so this is weird. Last Sunday, my dad came to verify that the pump was bad. While attempting to see if it would turn over, it sounded like it had no compression. I was like wtf, it ran fine two days ago. Just did a compression test, now that I had time to. And about 3 or 4 cylinders are zero psi. Highest cylinder went to 90 psi. 2 cylinders went 30 psi and another at 5 psi. Some pics.
 
  #13  
Old 02-02-2019, 12:31 PM
Z07Brandon's Avatar
Senior Member
Thread Starter
Join Date: Jun 2017
Location: Dallas, Tx
Posts: 517
Received 41 Likes on 36 Posts
Default



 
  #14  
Old 02-03-2019, 10:33 AM
Z07Brandon's Avatar
Senior Member
Thread Starter
Join Date: Jun 2017
Location: Dallas, Tx
Posts: 517
Received 41 Likes on 36 Posts
Default

This makes zero sense. But my dad sprayed starting fluid into the TB a few times and the engine finally started and ran great. I'm not trolling you guys or anything. He said this exact problem happened on one of his x308s.
 
  #15  
Old 02-03-2019, 12:54 PM
Lady Penelope's Avatar
Veteran Member
Join Date: Apr 2017
Location: Kansas City USA
Posts: 3,776
Received 1,214 Likes on 966 Posts
Default

With the engine rotating and the CKPS and ECU sees this the # 1 fuel pump relay will get the 3rd click on for the duration of the drive

So that is good along with your relay and pump if you only had the # 1 fuel pump on the normally aspirated engine

With only the key to on position only before start position do you get the r# 1 relay to click on then off after 4 seconds for your initial starting fuel charge ?

With the # 2 fuel pump there is a senerio where the # 2 fuel pump will turn on in the starting sequence other then the normal # 2 / 4000 RPM trigger on

I am not fully aware how this fail to start on # 1 then reverts to # 2 works as you have the car out of configuration like a removed # 1 relay

With the senerio that it's your # 2 fuel pump running your engine you can still have a issue with your # 1 pump not working at all in both the starting fuel charging sequence and engine rotating continence on for the drive

You would have to remove the # 2 relay and listen for the # 1 pump sound with the trunk open depending on your ear quality
 

Last edited by Lady Penelope; 02-03-2019 at 09:31 PM.
  #16  
Old 02-03-2019, 06:57 PM
Join Date: Dec 2009
Location: Decatur,TX
Posts: 7,867
Received 4,126 Likes on 2,703 Posts
Default

BORE WASH???

It does even happen with the AJ6/16 from time-to-time and that is NOT a nikasil engine.

bob
 
The following users liked this post:
Don B (02-05-2019)
  #17  
Old 02-03-2019, 08:15 PM
Z07Brandon's Avatar
Senior Member
Thread Starter
Join Date: Jun 2017
Location: Dallas, Tx
Posts: 517
Received 41 Likes on 36 Posts
Default

Originally Posted by motorcarman View Post
BORE WASH???

It does even happen with the AJ6/16 from time-to-time and that is NOT a nikasil engine.

bob
This is what my dad said as well. Very weird.
 
  #18  
Old 02-03-2019, 09:42 PM
Z07Brandon's Avatar
Senior Member
Thread Starter
Join Date: Jun 2017
Location: Dallas, Tx
Posts: 517
Received 41 Likes on 36 Posts
Default

Lady Penelope It's a single pump car. I'll have to double check if I get the 4 second click tomorrow morning.
 
The following users liked this post:
Lady Penelope (02-04-2019)
  #19  
Old 02-04-2019, 03:53 AM
Lady Penelope's Avatar
Veteran Member
Join Date: Apr 2017
Location: Kansas City USA
Posts: 3,776
Received 1,214 Likes on 966 Posts
Default

I won't be back until Monday afternoon

Put your finger on the relay and feel for the 2 clicks before the 3rd

The clicks verify you have the right commands to the relay but the relay can still be intermittently bad in not contacting for enough current flow to start the pump

Fuel pump relay swapping options ? as long as the same part number like maybe the A / C clutch , Heater water pump , Cabin blower
 

Last edited by Lady Penelope; 02-04-2019 at 04:04 AM.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
iconic
XJ XJ6 / XJR6 ( X300 )
9
06-01-2016 11:44 AM
75Gremlin
XJS ( X27 )
1
09-25-2014 07:27 PM
hdsg
XK8 / XKR ( X100 )
8
01-06-2014 04:04 PM
Skid Mark
XK8 / XKR ( X100 )
26
02-05-2013 10:22 PM
Spurlee
XK8 / XKR ( X100 )
15
03-26-2011 06:23 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

Thread Tools
Search this Thread
Quick Reply: '02 XJ Sport- No fuel pressure


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: