ULP 80 series sub tank won't transfer!

Submitted: Saturday, Jun 19, 2010 at 12:45
ThreadID: 79473 Views:6636 Replies:6 FollowUps:8
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Hi all,
I picked up a 94 80 series GXL 4500 UPL after drowning my old 1hz 80 series a while ago, & the sub tank will not transfer to the main when the sub button is pushed.

Yes, I have checked the operation of both the transfer pump as well as the solenoid & both work, I have also replaced the control unit inside the left rear quarter panel with no success.

I,ve also looked on the Lcool site & no luck there either, my next option is an auto elec' next time I'm in Alice but would like to have this resolved before then, so if anyone has had this happen & can suggest a solution I would be most pleased!!

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Reply By: Member - David Will (VIC) - Saturday, Jun 19, 2010 at 13:31

Saturday, Jun 19, 2010 at 13:31
Hi Jeff,

My mate had the same problem in his 93 petrol 80 Series.

He found out that if the main tank was not less than 1/4 full the pump would not transfer the fuel over.

He was told that just in case you forgot to turn the pump off there was room for all the sub tank fuel to fit in main tank without spilling out.

Hope this helps

David Will
Give a man a fish and he will eat for a day. Teach him how to fish, and he will sit in a boat and drink beer all day.

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AnswerID: 421415

Follow Up By: Ozrover - Saturday, Jun 19, 2010 at 14:29

Saturday, Jun 19, 2010 at 14:29
David,

I just checked & replaced all of the fuses & now the sub button doesn't light up at all! Before the sub button would light up briefly & you could hear the solenoid activate.

The main tank is currently at less than 1/4 & the sub is full, the next step will be to drain the main tank completley & see if that makes a difference?

Thanks.
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FollowupID: 691778

Follow Up By: Ozrover - Sunday, Jun 20, 2010 at 09:15

Sunday, Jun 20, 2010 at 09:15
I played with the fuses again & the light comes on again now, but still wont transfer.

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FollowupID: 691884

Reply By: Member - David Will (VIC) - Saturday, Jun 19, 2010 at 15:03

Saturday, Jun 19, 2010 at 15:03
Hi again Jeff,

Don't know if this will help but disconnect the battery for a few minutes and the electronics may reset them self l know this works on a Nissan GU.

I know you said that you have checked pump and solenoid, but have you tried to run the pump by just running a power wire to it direct and see if it pumps that way.

Have you checked all the hoses that they are not blocked.

I am trying to contact my mate but he wont answer his phone to see if he has any more info on this.

Hope you find the problem.

David Will
Give a man a fish and he will eat for a day. Teach him how to fish, and he will sit in a boat and drink beer all day.

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AnswerID: 421424

Follow Up By: Ozrover - Saturday, Jun 19, 2010 at 17:13

Saturday, Jun 19, 2010 at 17:13
David,

Yep did all of that, just had the main tank pump out & all looks well, next step is to have a look behind the dashboard & see if any thing looks out of place!

Thanks.
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FollowupID: 691792

Follow Up By: Member - David Will (VIC) - Tuesday, Jun 22, 2010 at 09:45

Tuesday, Jun 22, 2010 at 09:45
Hi Jeff,

I Finally got on to my mate and he said he had no idea what it could be, sorry I was not any help.

Have you had any more luck with it pumping?

I would be interested in the out come to this, so if you could let me know what happens that would be great.

Hope you sort it all out,

David
Give a man a fish and he will eat for a day. Teach him how to fish, and he will sit in a boat and drink beer all day.

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Follow Up By: Ozrover - Tuesday, Jun 22, 2010 at 10:55

Tuesday, Jun 22, 2010 at 10:55
David,

No luck so far, we're a bit busy here at the moment so I haven't been able to spend much time on it.

The next thing that I'm going to look at is the actual fuel gauges, if that doesn't work then I'll probably resort to running a figure 8 cable from the controller to the dashboard & activate the sub pump manually.

Thanks for the concern, that's what makes this such a great site.

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FollowupID: 692122

Reply By: Member - Graham H (QLD) - Saturday, Jun 19, 2010 at 19:40

Saturday, Jun 19, 2010 at 19:40
Does it actually transfer the fuel from one tank to the other.

A 100ser runs off either tank and doesnt transfer fuel like a Patrol does.

The Haynes manual is unclear as to where the sub pumps the fuel to.




AnswerID: 421451

Follow Up By: Ozrover - Sunday, Jun 20, 2010 at 09:13

Sunday, Jun 20, 2010 at 09:13
Graham,

I've got manuals for both the diesel & petrol 80 series & neither is clearly spelled out on how the diesel works but both are clear on how the petrol transfer works.

See below.

Thanks.
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FollowupID: 691883

Reply By: Member - Shane D (QLD) - Saturday, Jun 19, 2010 at 20:18

Saturday, Jun 19, 2010 at 20:18
Doesn't the 80 series just use whatever tank you have selected?

I dont think they transfer, the motor simply draws from what tank you have chosen, I know thats what my ,90 model T/D 80 series did.
Shane
AnswerID: 421463

Follow Up By: Ozrover - Sunday, Jun 20, 2010 at 09:02

Sunday, Jun 20, 2010 at 09:02
Shane,

My diesel 80 draws fuel for the engine from either the main or the sub tanks, whichever one is selected, the petrol 80 transfers from the sub to the main & only draws fuel to the engine from the main.

I think the problem is somewhere in the controller which doesn't allow the sub to transfer unless certain parameters are met, I just have to work out which one isn't talking to the others! simple eh!

Thanks
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FollowupID: 691881

Reply By: Cruiser 2091 - Saturday, Jun 19, 2010 at 20:22

Saturday, Jun 19, 2010 at 20:22
Hi ozrover.
you said that the light glows briefly when you press the button. Now this is what normally happens when you try to pump from an empty sub tank. So I am assuming that there is some device (level switch) in the sub tank that turns the pump off when the tank is empty. So it could be that this device is stuck or faulty, I would be looking for some wires coming out of the sub tank.
AnswerID: 421465

Follow Up By: Ozrover - Sunday, Jun 20, 2010 at 09:09

Sunday, Jun 20, 2010 at 09:09
Cruiser,

Hmmm, I thought the controller worked through the main & sub tank fuel gauges, but maybe they work through sensors in the fuel tank pick ups.

I've already checked the main tank pump assembly, looks like i'll have to pull out the sub tank one as well.

Thanks for that!
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FollowupID: 691882

Reply By: Ozrover - Wednesday, Jul 14, 2010 at 13:22

Wednesday, Jul 14, 2010 at 13:22
Thanks for all the help guys!

I finally found the problem with the sub tank not transferring, there was a broken wire from the plug block coming from the main tank to the sub tank controller.

I've fixed this temporarily by soldering the wires together, but I will be cutting out the connector & fitting longer wires together & re-routing them so that they cannot get damaged again!

AnswerID: 424016

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