sub tank has stopped working

Submitted: Monday, Jan 09, 2006 at 06:16
ThreadID: 29492 Views:1636 Replies:8 FollowUps:0
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On the 2.8 nissan patrol when we push the sub button it is not draining the tank,really need this to be in action before our big trip.

hopefully someone here can point us in the right direction for a quick easy fix.

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Reply By: Notso - Monday, Jan 09, 2006 at 06:42

Monday, Jan 09, 2006 at 06:42
Had a problem with mine early in it's life. They replaced a computer card somewhere.
AnswerID: 147318

Reply By: blackwrx - Monday, Jan 09, 2006 at 07:45

Monday, Jan 09, 2006 at 07:45
that sounds expensive!
AnswerID: 147319

Reply By: Member - Roachie (SA) - Monday, Jan 09, 2006 at 08:29

Monday, Jan 09, 2006 at 08:29
I'd be disconnecting the battery first up.......on some of these Patrols, they get to a situation where something is wrong (minor problem) and the disconnecting of the power re-sets it.....It worked for me last year (but in my case the sub-tank warning light was on).

2nd thing to do would be crawl underneath the truck with a 10mm spanner and remove the 2 metal protection plates that surround the pump (it is just underneath the drivers seat). That should expose the 2 wires that run the pump. There should be a plug/s for these wires. If so, unplug them and try hooling up 12 volts directly from a battery and see if that makes the pump work.

Some blokes have reported installing a new switch and by-passing the factory pump control system've just gotta remember to turn it off when the fuel is finished pumping across.

Good luck

AnswerID: 147323

Reply By: Grungle - Monday, Jan 09, 2006 at 08:48

Monday, Jan 09, 2006 at 08:48
Sub will not pump if main tank is full (more than 3/4's but varies from vehicle to vehicle due to erronous indication) - safety feature. It is switched on by the main tank float level and sub tank float level so when main is low and sub is not empty, you can switch the sub pump on. Could be the light not working. Switch pump on and open main filler cap. Should be able to see diesel being pumped into the filler about 5 inches down neck. If you have a turbo timer this can play havoc with the sub tank but you will get a 'sub tank' warning light if this happens.

Apart from that you can check pump directly as Roachie suggested. The plug for the pump is on the passengers side of the pump mounting box. Just a 2 wire jobbie so easy to check.

AnswerID: 147329

Reply By: flappa - Monday, Jan 09, 2006 at 09:05

Monday, Jan 09, 2006 at 09:05
The Sub tank in my 4.5 stopped working becuase of low fuel.

Disconnected the battery for about 1/2 an hour . . . bingo . . . away she went.

It was some sort of fuel pump protection.

Give that a try first.
AnswerID: 147334

Reply By: blackwrx - Monday, Jan 09, 2006 at 20:58

Monday, Jan 09, 2006 at 20:58
thanks fellas, will give these tips a go and let you know the outcome!
AnswerID: 147479

Reply By: Peter - Monday, Jan 09, 2006 at 21:41

Monday, Jan 09, 2006 at 21:41
On my last trip from Qld to Vic the sub tank refused to work all the way through NSW. Worked perfectly in Qld and Vic and hasn't missed a beat since (I've done nothing to fix it). I was on the back roads a bit and towing the van and have noticed that the tank doesn't like working on corrugations etc. Around town, never a problem.
AnswerID: 147491

Reply By: ferris - Thursday, Jan 19, 2006 at 19:22

Thursday, Jan 19, 2006 at 19:22
Sorry about the late reply, but I had a similar experience, stuck in Arnhem Land with 75 l (long range tank) that I couldn't access and needed. I took the pump off, stripped it down, reassembled and it started working. Couldn't find any obvious fault but it worked well from there on. cheers.
AnswerID: 149662

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