Sub-Tank Capacity

Can't find a category above, then post here
User avatar
Alex Roux
Patrolman 1000+
Patrolman 1000+
Posts: 2400
Joined: 11 Jul 2011 10:54
Full Name: Alexander Roux
Nickname: Witblits
Home Town: Johannesburg
Current 4x4: 2004 GU 3TDi (Lexus) - aka "Witblits"
1996: GQ TB48 conversion - aka "Skilpad"
1993: GQ SWB TB42 - aka "Shortie"
Home Language: Afrikaans
Has thanked: 37 times
Been thanked: 108 times

Re: Sub-Tank Capacity

Post by Alex Roux » 23 Jul 2015 12:47

I have never filled more than 38 litres in the sub-tank.
Not sure how Ian got almost 40litres? Less sludge?

Anyways, when does your red light go on?
For my main it goes on at 80 litres. Or rather, I only get to fill up 80 litres in the main tank if I go to station directly after red light.
Skilpad, Shortie & Witblits (in no particular order)

User avatar
Michael
Moderator
Posts: 2437
Joined: 05 Mar 2014 14:39
Full Name: Michael
Nickname: Steyn
Home Town: Centurion
Current 4x4: Patrol GU 4.2 Turbo Diesel
Home Language: Afrikaans
Location: Centurion, PTA
Has thanked: 139 times
Been thanked: 220 times

Re: Sub-Tank Capacity

Post by Michael » 23 Jul 2015 12:53

[quote="Wilkie"]I think all pre 1999 did not have sub tanks 4.2 and 4.5 petrol and diesel
But guys reading this tread and running your main thanks dry is not a good thing,you sucking up all the dirt in the fuel tank and tomorrow the vehicle is not pulling well,
cause off all the muck has now gone into the inline fuel filter and blocked itquote]

As far as I know this makes no difference as the diesel is always sucked from the bottom of the tank :mytwocents:
"The Just shall live by Faith" Rom1:17

Check out my build here My Patrol
And my engine rebuild here mostly engine related stuff

User avatar
Michael
Moderator
Posts: 2437
Joined: 05 Mar 2014 14:39
Full Name: Michael
Nickname: Steyn
Home Town: Centurion
Current 4x4: Patrol GU 4.2 Turbo Diesel
Home Language: Afrikaans
Location: Centurion, PTA
Has thanked: 139 times
Been thanked: 220 times

Re: Sub-Tank Capacity

Post by Michael » 23 Jul 2015 12:56

iandvl wrote:On the same note - and specifically since there are very definitely differences in sizes between subtanks (as we've seen in terms of figures posted in yesterday's thread and today's).

Michael, is your 'trol a GL ? Reason for the question is that Marinus has mentioned that the sub-tank was an optional extra on the GL's. It is sort of confirmed by Cedric's comment about not having the sub-tank meters and similar in the cluster. As such, perhaps someone fitted the tank afterwards. Michael - is your sub-tank an OEM sub-tank (ie: manufactured by Nissan), or was it manufactured by a third party.

I just cannot understand that it only takes 30L. This is what confused me about yesterday's thread...
Mine is a GL yes, as far as I know the sub tank came standard with the car as I have the sub tank gauge and the button and everything.
I also do not have a fuel warning light in mine, so I have to be very carefull when the needle hits the red section on the gauge
"The Just shall live by Faith" Rom1:17

Check out my build here My Patrol
And my engine rebuild here mostly engine related stuff

User avatar
JoshJ
Patrolman 1000+
Patrolman 1000+
Posts: 1038
Joined: 30 Nov 2013 16:16
Full Name: Joshua Joubert
Nickname: Joshua
Home Town: Swakopmund Namibia
Current 4x4: 2003 Patrol 4.8 GRX
Home Language: Afrikaans
Has thanked: 79 times
Been thanked: 84 times

Re: Sub-Tank Capacity

Post by JoshJ » 23 Jul 2015 13:26

This is interesting. Just something I can add from when I was struggling in the beginning with feul supply. I had the prevelidge to see the pick-up in my tank. Its straight down to the bottom of the tank leaving only few mm gap from the bottom. But its positioned more to the driverside and back of the tank. So if your car is slightly standing downhill like mine currently is due to the heavy duty OME suspension and no load. Youlle have feul to the front wich you cannot reach. How much I dont know.

Then my car at that point ran out of feul at around the 1/4 level mark. Long story short. It was dirty filters that restricted the flow to the pump. With the tank level low there was not enough gravity pressure to reach the pump through the dirty filters. We changed the filters en the problem was gone.

So this can be why some guys run out of feul before lights come on or the full 95liters are used up. Just a thought. :mytwocents:
Being alive is a Blessing!!

Regards,
Joshua

User avatar
JoshJ
Patrolman 1000+
Patrolman 1000+
Posts: 1038
Joined: 30 Nov 2013 16:16
Full Name: Joshua Joubert
Nickname: Joshua
Home Town: Swakopmund Namibia
Current 4x4: 2003 Patrol 4.8 GRX
Home Language: Afrikaans
Has thanked: 79 times
Been thanked: 84 times

Re: Sub-Tank Capacity

Post by JoshJ » 23 Jul 2015 13:39

This is from the manual I got with the car. Maybe you guys with the smaller sub tanks have an Australian version.
20150723_133604.jpg
20150723_133604.jpg (1.96 MiB) Viewed 1094 times
Being alive is a Blessing!!

Regards,
Joshua

User avatar
iandvl
Patrolman 1000+
Patrolman 1000+
Posts: 1044
Joined: 12 Jan 2015 13:26
Full Name: Ian de Villiers
Nickname: Ian
Home Town: Brits
Current 4x4: Nissan Patrol 4.5 GRX
Nissan Hardbody 2.4 4x4
Home Language: English
Has thanked: 114 times
Been thanked: 118 times

Re: Sub-Tank Capacity

Post by iandvl » 23 Jul 2015 13:39

Alex Roux wrote:I have never filled more than 38 litres in the sub-tank.
Not sure how Ian got almost 40litres? Less sludge?

Anyways, when does your red light go on?
For my main it goes on at 80 litres. Or rather, I only get to fill up 80 litres in the main tank if I go to station directly after red light.
Alex,

As mentioned, I've got no idea when my light goes on. It came on briefly on Tuesday afternoon on a steep uphill and went out again when the road levelled. Quite a number of kilometres, the 'trol cut out. In short: I've got no idea how much fuel I have left when the light first starts burning. Josh's story about the filters and similar may apply, but I had the vehicle serviced very, very recently. This included fuel filters. I'll dig and see what I can do.

A side note regarding the volume I put into the sub-tank this morning - this may not be entirely accurate. The vehicle has been refuelled completely under exceptional circumstances - ie: it had just been run completely bone dry - not something I normally do. I've read before (I think it is in the owner's manual) that the pump which moves fuel from the sub-tank to the main tank will be activated for several seconds when the ignition is first turned on. It is possible that the sub tank still contained ~2L of petrol (ie: the discrepancy between your fill-ups and mine) when the vehicle died, and the several attempts to start the vehicle at the time resulted in the remainder of the fuel being pumped into the main tank. I'm not sure. This should technically have provided me with enough fuel to start the vehicle. However, I will keep an eye on the amount of petrol put into the sub-tank the next time I fill it up, and I will post those results here.

All-in-all, I'm pleased to have started this thread, as it is relatively fascinating. :)

User avatar
JoshJ
Patrolman 1000+
Patrolman 1000+
Posts: 1038
Joined: 30 Nov 2013 16:16
Full Name: Joshua Joubert
Nickname: Joshua
Home Town: Swakopmund Namibia
Current 4x4: 2003 Patrol 4.8 GRX
Home Language: Afrikaans
Has thanked: 79 times
Been thanked: 84 times

Re: Sub-Tank Capacity

Post by JoshJ » 23 Jul 2015 13:55

Ian. The point I was trying to make is that one should take care of what type of filter to use. I think that not all filters have the same density filter inside. So its important to get one closest to manufacturing specs. Because the balance of the complete feul system was designed around a spisific density of filter. If someones is not the same as factory spec. Its not a train smash. But it wil get you in te detail. We are now in the detail. I could not beleave that that filter that came from my car could starf it of so much feul. The car registered pump pressure errors and feul failure. We thought it was the pump. :lol:
Being alive is a Blessing!!

Regards,
Joshua

Wilkie
Patrolman 1000+
Patrolman 1000+
Posts: 1305
Joined: 24 Feb 2014 15:33
Full Name: Errol Wilken
Nickname: Wilkie
Home Town: Pretoria
Current 4x4: 1999 4.5 GRX Nissan Patrol
Rebuilding Nissan safari ldv
2004 BMW 3.0D X5
Home Language: Afrikaans
Has thanked: 57 times
Been thanked: 78 times

Re: Sub-Tank Capacity

Post by Wilkie » 23 Jul 2015 15:31

Ian
my 1st patrol I got was a 1998GL 4.5 I,there were no sub tank gauge or dash button but it had a OME 60l sub tank in,but clearly aftermarket.
my latest Patrol 1999GRX 4.5I has got all the bells and whistles and it has "40liters "sub tank in it,but also the most I could get in was 38l.

On that other point of the sub tank fuel pump pumps it bit of fuel when ign is turned on ,explains why my sub tank gauge starts to drop after a few weeks ,as I
only drive the car on Saturdays when I go and play golf 5kms from home..thx 4 that info....I thought the car has got a fuel leak somewhere :thumbup:

User avatar
Peter Connan
Moderator
Posts: 4933
Joined: 10 Sep 2010 07:21
Full Name: Peter Connan
Nickname: Piet
Home Town: Kempton Park
Current 4x4: 1996 Patrol 4.2SGL
Home Language: Afrikaans
Location: Kempton Park
Has thanked: 186 times
Been thanked: 266 times

Re: Sub-Tank Capacity

Post by Peter Connan » 23 Jul 2015 17:39

Michael, my car has non-standard tanks. The fuel system was set up strangely. It had a three-way valve installed under the driver's seat, and could thus suck from either tank, but the sub-tank doesn't have a gauge, so the only way to know what was going on was to suck it dry.

On the first couple of occasions I did this, I got blocked idling jets in the carb.

What I am saying is that for whatever reason, running the tank dry does suck up whatever is in the bottom. Since then I have tried to run them dry every so often, effectively trying to keep them clean, so that I don't get enough dirt to overwhelm the filter. Of course, this is much less of an issue with a petrol.
Mag ons ons kenniskry met lekkerkry aanhoukry.

User avatar
Michael
Moderator
Posts: 2437
Joined: 05 Mar 2014 14:39
Full Name: Michael
Nickname: Steyn
Home Town: Centurion
Current 4x4: Patrol GU 4.2 Turbo Diesel
Home Language: Afrikaans
Location: Centurion, PTA
Has thanked: 139 times
Been thanked: 220 times

Re: Sub-Tank Capacity

Post by Michael » 23 Jul 2015 20:10

Well I filled my sub tank this afternoon and I could only manage to get 33.68L in, this is right up to the cap. Im sure of it that mine is the Australian setup
Attachments
Screenshot_2015-07-23-19-57-41.png
Screenshot_2015-07-23-19-57-41.png (1.64 MiB) Viewed 1040 times
"The Just shall live by Faith" Rom1:17

Check out my build here My Patrol
And my engine rebuild here mostly engine related stuff

Post Reply

Return to “15. Other Patrol Stuff”

Who is online

Users browsing this forum: Alex Roux, Google [Bot], hugejp, offroadbiker and 3 guests