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Vago487

Member Since: 15 Nov 2019
Location: Cornwall
Posts: 9

2012 Defender 90 Puma 2.2 HT Firenze Red

2.2 TDCI Fuel Pump

Good Morning,

Looking for a bit of advice if possible, I've had a trawl and I can't seem to find any history of a similar issue unfortunately.

After not being used for a few days, went to use the vehicle and dead as a dodo, battery was reading under 5v. Managed to get it started and charged the battery to an acceptable level and took it for a drive, no issues. Had a quick look for any obvious parasitic drains in the usual places and unfortunately drew a blank.

Came out the the vehicle this morning after it being being left cold and dark overnight and what sounded like the in tank fuel pump was running. It started usually and when shut off the fuel pump ceased to make a noise.

Had a quick check in the under seat fusebox and the relay highlighted in the attached photo was warm.

Has anybody come across a similar issue to this before, or has any ideas what maybe causing an issue like this? Any advice or insight would be much appreciated.

(The vehicle did have the intake manifold removed a couple of weeks ago if this could be related)

Thanks

4th Jan 2023 8:14am

cretesimon

Member Since: 01 Nov 2021
Location: heraklon
Posts: 51

Hi there did you try to swap the relay for a different one maybe a sticking relay or maybe a bad ignition switch?

4th Jan 2023 9:04am

Vago487

Member Since: 15 Nov 2019
Location: Cornwall
Posts: 9

Thanks for the response,
My first port of call this evening is to change the relay and see if it resolves the problem. I'm 90% sure this is the offending relay, unfortunately for the life of me I haven't been able to lay my hands on a 2.2 relay diagram, so the assumption this is the fuel pump relay is simply based on it being warm when everything else was cold.

4th Jan 2023 9:53am

steveww

Member Since: 05 Jan 2022
Location: Uppingham
Posts: 570

2015 Defender 110 Puma 2.2 XS CSW Bronze Green

I saved this from another thread on this forum.

Click image to enlarge

1 = R100 Main
2 = R104 Power
3 = R117 Cooling Fan
4 = R123 Headlamp
5 = R138 Heated Rear Screen
6 = R134 Front Wipers
7 = R103 Fuel Pump
8 = R102 Starter
9 = R176 Blower
10= R181 A/C Comp. Clutch

4th Jan 2023 9:56am

Vago487

Member Since: 15 Nov 2019
Location: Cornwall
Posts: 9

Thanks for the diagram, it confirmed which relay I suspected was the offending one.
Changed the relay, seemed to fix the problem, unfortunately I went outside to the car this morning and the pump was running again (car had been cold and dark overnight).
I've checked the wiring and there is no obvious damage/chafing and other than this issue the car is functioning normally.
One thing I have noticed is both times its happened it is after it has been driven in the wet.
At a bit of a loss as to what the issue could be now?

10th Jan 2023 1:51pm

Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 2031

I’m wondering if it could be your ignition switch or wiring from it. Is anything else showing when ignition switch is off that would normally show if ignition was in the II position, as IIRC thats the position the key will be in to activate the fuel pump relay and fuel pump.

If not then it could be an ECU issue or an issue with the wiring from the ECU to the relay , from the wiring diagrams it looks like the ECU extends an earth via a blue wire to activate the relay. The connector at the ECU could be wet, but also the blue wire could be chafed and being grounded when it gets wet.

Wiring diagram for LHD but expect it’s same for RHD https://www.lrworkshop.com/wiring-diagram/...fuel-lines

10th Jan 2023 2:57pm

Vago487

Member Since: 15 Nov 2019
Location: Cornwall
Posts: 9

Many thanks for the response, I haven't noticed any other symptoms resembling the ignition being on, however I must admit I haven't actively been looking for it.
The Ecu link had crossed my mind, it had been at a local specialist before Christmas and ended up having the intake manifold removed to sort another issue, ever since then is when its displayed this problem. Inadvertently, I guess they may have disturbed something or simply a coincidence, either way I feel its worth a look.

10th Jan 2023 3:30pm

Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 2031

The ECU and wiring is in the right location to be disturbed (or wires damaged) while removing the inlet manifold

Some good pics of the ECU and how to release the connectors to check them on the BAS site. https://bellautoservices.co.uk/bas2rrc-hel...a-2-2-ecu/

10th Jan 2023 5:25pm

Vago487

Member Since: 15 Nov 2019
Location: Cornwall
Posts: 9

Click image to enlarge
Any further ideas?
I thought the problem has resolved itself and hadn't had a reoccurrence over the last few months. Went out earlier and the fuel pump was running by itself again.
On further digging I can get the relay (and subsequently the fuel pump) to engage and disengage (No key in ignition) by moving the loom that enters the underseat through the large rubber grommet as shown in the attached photo.

30th Apr 2023 9:27pm

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