Fuel Pump/Relay problem

roverblue · 9th April 2014, 15:30

I have a 2002 diesel conoisseur. The proplem appeared about 2 weeks ago.
The car failed to start, turning over no problem. I called the RAC, after checking several thing he pulled out the relay in the engine bay and replaced it car started. I replaced the relay with a new one and have had no problems since. That is until today.The same car would not start, I changed over relays, still no good. Called RAC again and car started when they arrived.
Any one have any ideas where I should start looking for the problem?

HarryM1BYT · 9th April 2014, 16:35

Quote:

Originally Posted by roverblue

I have a 2002 diesel conoisseur. The proplem appeared about 2 weeks ago.
The car failed to start, turning over no problem. I called the RAC, after checking several thing he pulled out the relay in the engine bay and replaced it car started. I replaced the relay with a new one and have had no problems since. That is until today.The same car would not start, I changed over relays, still no good. Called RAC again and car started when they arrived.
Any one have any ideas where I should start looking for the problem?

Does it refuse to start hot or cold, or both?

Get some Easystart, for diagnostic purposes. When it refuses to start, squirt some into the EGR. If it then starts, look at injector leak back and possible cam or crank sensor failing.

Also watch the rev counter when it refuse to start, you should see it pulsing slightly as it cranks.

Get back to us, when you know more.

roverblue · 9th April 2014, 17:35

The two times it has happened, once hot, had only stopped a couple minutes, today I had stopped for about 40 minutes while shopping.
When I swithched the ignition on, the pump was silent. Once started I drove the five miles home with no problem. Just went to start, it started no problem.

marinabrian · 9th April 2014, 17:42

Quote:

Originally Posted by roverblue

I have a 2002 diesel conoisseur. The proplem appeared about 2 weeks ago.
The car failed to start, turning over no problem. I called the RAC, after checking several thing he pulled out the relay in the engine bay and replaced it car started. I replaced the relay with a new one and have had no problems since. That is until today.The same car would not start, I changed over relays, still no good. Called RAC again and car started when they arrived.
Any one have any ideas where I should start looking for the problem?

Have a look at this post HERE and you may wish to check both that the plenum drains are clear, and the wiring to your main relay is sound.

There are attached wiring diagrams in the form of PDF's that can be used to assist in the fault finding process.

If you find your ECM has been for a swim, I will be able to assist you

HTH

Brian

roverblue · 9th April 2014, 18:03

Thanks. I will speak to an auto electrician tomorrow. Unfotunatley modern auto electrics is beyond me. I check the plenum chambers often and so far they have been dry.

marinabrian · 9th April 2014, 18:11

Quote:

Originally Posted by roverblue

Thanks. I will speak to an auto electrician tomorrow. Unfotunatley modern auto electrics is beyond me. I check the plenum chambers often and so far they have been dry.

It's only four wires to test, armed with a multimeter you shouldn't have a problem

Brian

T-Cut · 9th April 2014, 18:23

Quote:

Originally Posted by roverblue

- - - - he pulled out the relay in the engine bay and replaced it car started. I replaced the relay with a new one and have had no problems since. That is until today. The same car would not start, I changed over relays, still no good.

I thought the diesel pump/pumps relay was on the glove box fuse board.

TC

marinabrian · 9th April 2014, 18:41

Quote:

Originally Posted by T-Cut

I thought the diesel pump/pumps relay was on the glove box fuse board.

TC

It is, however by inference by the OP's original post, I thought the RAC chap had been playing with the main relay.

If the main relay doesn't power up, then the DDE4 isn't initialised, and no fuel pump relay output either.

Brian

HarryM1BYT · 9th April 2014, 19:25

Quote:

Originally Posted by marinabrian

It is, however by inference by the OP's original post, I thought the RAC chap had been playing with the main relay.

If the main relay doesn't power up, then the DDE4 isn't initialised, and no fuel pump relay output either.

Brian

I was working on the assumption that the car starting just after the main relay had been disturbed was entirely coincidental - disturbing it a second time made no difference to the ability to start.

Would it be able to crank with the main relay open? The OP mentioned it cranked, but failed to start.

marinabrian · 9th April 2014, 19:27

Quote:

Originally Posted by HarryM1BYT

I was working on the assumption that the car starting just after the main relay had been disturbed was entirely coincidental - disturbing it a second time made no difference to the ability to start.

Would it be able to crank with the main relay open? The OP mentioned it cranked, but failed to start.

Yes, Harry the car will crank with the main relay removed.

This is likely to be a wiring fault concerning the black and pink wire between the main relay pull in coil, and the DDE4

Brian

9th April 2014, 15:30	#1
roverblue Newbie Rover 75 Saloon Join Date: Jul 2012 Location: Luton Posts: 13 Thanks: 5 Thanked 1 Time in 1 Post	Fuel Pump/Relay problem I have a 2002 diesel conoisseur. The proplem appeared about 2 weeks ago. The car failed to start, turning over no problem. I called the RAC, after checking several thing he pulled out the relay in the engine bay and replaced it car started. I replaced the relay with a new one and have had no problems since. That is until today.The same car would not start, I changed over relays, still no good. Called RAC again and car started when they arrived. Any one have any ideas where I should start looking for the problem?

9th April 2014, 17:35	#3
roverblue Newbie Rover 75 Saloon Join Date: Jul 2012 Location: Luton Posts: 13 Thanks: 5 Thanked 1 Time in 1 Post	fuel pump/relay The two times it has happened, once hot, had only stopped a couple minutes, today I had stopped for about 40 minutes while shopping. When I swithched the ignition on, the pump was silent. Once started I drove the five miles home with no problem. Just went to start, it started no problem.

9th April 2014, 18:03	#5
roverblue Newbie Rover 75 Saloon Join Date: Jul 2012 Location: Luton Posts: 13 Thanks: 5 Thanked 1 Time in 1 Post	Thanks. I will speak to an auto electrician tomorrow. Unfotunatley modern auto electrics is beyond me. I check the plenum chambers often and so far they have been dry.