self draining patrol sub-tank

Submitted: Friday, Mar 19, 2004 at 22:48
ThreadID: 11399 Views:1474 Replies:9 FollowUps:0
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Gidday All,When I fill both tanks on my 1998 2.8 patrol all is well.As the fuel level in the main tank drops to approx 2/3 full the sub tank decides to transfer to the main with no help from me.There is no way I can prevent this from happening.
Has anyone out there had this problem and how did they fix it.
Thanks Locallaw
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Reply By: Nomad - Friday, Mar 19, 2004 at 22:56

Friday, Mar 19, 2004 at 22:56
Sorry locallaw don't think I can help. My 2000 Patrol will run out of full but won't drain the sub unless I hit the sub tank button on the dash. It will then empty the sub into the main. If you turn off the ignition before it's finished then you have to hit the button again when you start the engine again.

Cheers

Nomad
AnswerID: 51111

Reply By: Willem - Friday, Mar 19, 2004 at 23:59

Friday, Mar 19, 2004 at 23:59
Might be something to do with the venting of the tanks.

Why does it bother you?
AnswerID: 51116

Reply By: Member - Bigbear - Saturday, Mar 20, 2004 at 00:02

Saturday, Mar 20, 2004 at 00:02
Locallaw
This problem is standard practice on my GQ when I fitted ARB main tank and aux.
Fill them both and it draws down the aux then the main, no switches pumps or anything else mechanical. I know the GU is supposed to work with a transfer pump and the only thing I can think of would be that the breather hose to let air into your main tank must be partially blocked, therefore creating a restriction and making it draw from the aux tank. That is my thoughts.
Bigbear
AnswerID: 51117

Reply By: Waynepd (NSW) - Saturday, Mar 20, 2004 at 00:09

Saturday, Mar 20, 2004 at 00:09
Hi Locallaw,
As far as I know, the sub tank pump runs for a pre-determined time at startup on my 98 GU 4.2, is this what you are talking about?

AnswerID: 51118

Reply By: fourstall2000 - Saturday, Mar 20, 2004 at 08:55

Saturday, Mar 20, 2004 at 08:55
With the GU 3.0 litre, the sub tank transfer pump operates for several seconds every time you restart the engine.
This is a design feature to ensure the pump does not gum up from non use.
The result of this is that over several days of intermitittant driving the sub tank becomes empty.
It is annoying but at least the fuel is always fresh and free from bugs.
Perhaps you system is the same,ask your Nissan dealer or ring tech line.
Regards
AnswerID: 51128

Reply By: rolande- Saturday, Mar 20, 2004 at 10:43

Saturday, Mar 20, 2004 at 10:43
It does this so you don't run out fo fuel while the sub is still full, as above, runs for a pre-determined time each time the engine starts. Don't understand why this would be a fault? There to ensure fuel mixes and does not go "stale" by sitting in the sub for extended periods. You will find on long trips does not happen due to the reasons already listed. I think its a good system, use it to you're advantage
rolande
AnswerID: 51145

Reply By: Eric Experience. - Saturday, Mar 20, 2004 at 22:24

Saturday, Mar 20, 2004 at 22:24
Locallaw.
The transfer pump on all Nissans have valves in them like a normal mechanical petrol pump, these valves alow fuel to flow from the auxilary tank to the main tank. The pump does not have to be switched on for this to happen because the motion of the vehicle is enough to force the valves open whenever you go around a corner. Some one started this myth about the pump being turned on by the computer on start up and the myth has become common belief. You will find almost pumps on auxilary tanks do the same even on models without a computor. Eric.
AnswerID: 51214

Reply By: Member - Nino F (VIC) - Sunday, Mar 21, 2004 at 11:15

Sunday, Mar 21, 2004 at 11:15
Locallow,
R.T.F.M. read page 1-23 of the owners handbook.This is normal. It stops fuel going stale by ensureing its mixed and used.
AnswerID: 51245

Reply By: locallaw - Sunday, Mar 21, 2004 at 18:48

Sunday, Mar 21, 2004 at 18:48
Thanks to everyone who replied.I received quiet a lot of different answers but I have a good idea what is happening now.
Thanks everyone
Martin(locallaw)
AnswerID: 51277

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