sub tank
Submitted: Tuesday, Oct 31, 2006 at 21:26
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Hunt
Hi all,
I have an 80series (1995) petrol cruiser. The sub
tank seems to be draining into main
tank even when I haven't engaged the sub
tank control on the dash. Does anyone know what the problem could be, & if so is it easy to fix?
Thanks for any advice. Brett
Reply By: Member - Dedalus (SA) - Tuesday, Oct 31, 2006 at 21:49
Tuesday, Oct 31, 2006 at 21:49
Hi, I have the same "problem" ..... I think it is "normal " ... It will transfer only some ammount of petrol, not the lot!
AnswerID:
202172
Reply By: GQ_TUFF - Tuesday, Oct 31, 2006 at 22:03
Tuesday, Oct 31, 2006 at 22:03
Not much help to you, But I have a 99 GU which seems to let a little through, mainly in off road situations, doesn't seem to do it on road.
Cheers Stefan
AnswerID:
202180
Follow Up By: Grungle - Wednesday, Nov 01, 2006 at 07:25
Wednesday, Nov 01, 2006 at 07:25
Hi Stefan,
The GU's will transfer fuel from the sub to the main every time you start the car for around 5-10 seconds. Its automatic and is independant of the sub
tank switch. Will only stop if the sub
tank is empty.
Regards
David
FollowupID:
461700
Follow Up By: GQ_TUFF - Wednesday, Nov 01, 2006 at 18:21
Wednesday, Nov 01, 2006 at 18:21
cool I did not know that.....you learn everyday
Thanks David
FollowupID:
461813
Reply By: Rock Crawler - Tuesday, Oct 31, 2006 at 23:58
Tuesday, Oct 31, 2006 at 23:58
its normal
AnswerID:
202205
Follow Up By: Scoey (QLD) - Wednesday, Nov 01, 2006 at 11:06
Wednesday, Nov 01, 2006 at 11:06
Not on
mine - 94 Petrol GXL 80 Series. I can (read: could) run the main bone dry and still have the sub
tank full - it only transfers when I press the "Sub" switch on.
But then again maybe
mine's the one with the "problem" hehe!
Cheers
Scoey!
FollowupID:
461736
Follow Up By: Hairy - Wednesday, Nov 01, 2006 at 13:50
Wednesday, Nov 01, 2006 at 13:50
Mine doesnt either.
FollowupID:
461759
Follow Up By: BenSpoon - Wednesday, Nov 01, 2006 at 16:04
Wednesday, Nov 01, 2006 at 16:04
It does pump a litre or two I am told when you start the engine. Its to keep the pump and seals lubricated. I have noticed it on
mine on trips where you stop/start the engine often the sub
tank will go from 1/2 full to 1/4 full over a day. I think it has to drain a fair bit before it will register on the fuel gauge (same as the main
tank) so you dont notice it when it is fully topped up.
FollowupID:
461788
Reply By: Grungle - Wednesday, Nov 01, 2006 at 07:31
Wednesday, Nov 01, 2006 at 07:31
Hi Brett,
Could it be the air in the
tank expanding due to heat and pushing fuel into the main? Do you see it more when the sub
tank has less fuel in it than when it is full (more air volume and greater ability to expand)? In this case you may have a blocked breather on the sub
tank.
It may also be the same as the GU where the subtank ECU is designed so as to transfer a small amount of fuel each time the car is started (as mentioned above). Don't ask me why but could have something to do with keeping the line primed or pump lubricated.
Regards
David
AnswerID:
202219
Reply By: kesh - Wednesday, Nov 01, 2006 at 07:56
Wednesday, Nov 01, 2006 at 07:56
If the operating system is the same as the diesel there are 2 control solenoids, one in the feed to the engine, the other the return.
From new, my '97 1hz. would empty both tanks when the sub
tank ccontrol was activated. It was caused by gritty particles holding the solenoid valves open, took many attempts to overcome but finally ok.
Its a pain to get at these solenoids for removal, and I had to make a set of leads to hold the valve open whilst the muck was blown out with comp. air.
hope of some help. kesh
AnswerID:
202222
Reply By: Penguin (NSW) - Wednesday, Nov 01, 2006 at 10:08
Wednesday, Nov 01, 2006 at 10:08
Hi Brett
It's normal. When you start the engine, the sub-
tank pump operates for a short while to keep it lubricated which, over time, will empty your sub-
tank.
Mike
AnswerID:
202246