79 Series V8 run out of fuel with 25L in the tank?

Submitted: Friday, Jun 17, 2016 at 10:30
ThreadID: 132771 Views:3788 Replies:6 FollowUps:17
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This morning my 2013 79 started running badly, juddering as if it were running out of fuel. Gauge was below a quarter but no light was on.
I limped it to a servo and filled up and now all seems OK. I put in 106L so there should have been 24L left in the 120L tank, not all usable I know but that seems a lot to have left in there that couldn't be used.
The other thing is I had a secondary fuel filter fitted a couple of weeks ago, with no issues noticed previously.

Just wondering if anyone else has experienced this or if it could be related to the second filter addition.

Thanks
Chris
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Reply By: Bob Y. - Qld - Friday, Jun 17, 2016 at 11:06

Friday, Jun 17, 2016 at 11:06
Sounds like you have a dual cab, Chris? Seems like a lot of fuel left, maybe the suction pipe is a bit higher than normal to leave that much behind

In our single cab, we can comfortably use 80L or a little more, from the 90L tank. The gauge is on empty at this point. It's worthwhile leaving 10% in the tank, to ensure there's no rubbish being regularly sucked into the filters.

Might be worth checking the hoses/clamps on the secondary filter, in case they aren't tight. Have had no trouble with secondary fitted to ours last year.

Bob

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Can't remember most of it.

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AnswerID: 601453

Follow Up By: Bend27 - Friday, Jun 17, 2016 at 12:17

Friday, Jun 17, 2016 at 12:17
+ What Bob said, Had a similar same problem, traced it to a loose clamp, it was sucking air after the filter and before the Injectors and would drain half the filter reservoir over night and would not start in the morning. Bit nerve wrecking when you're in the middle of the scrub with no phone reception...
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Follow Up By: Cruiser695 - Friday, Jun 17, 2016 at 12:37

Friday, Jun 17, 2016 at 12:37
Thanks guys, I will check the clamps this weekend. Odd though that it fixes it after a fuel fill up, but I only drove it 2km to the bus stop after filling up, wasn't game to drive into town just in case. Will have a proper testing tomorrow.

Yes Bob, a dual cab.

Thanks again.
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Follow Up By: Allan B (Member, SunCoast) - Friday, Jun 17, 2016 at 13:02

Friday, Jun 17, 2016 at 13:02
.
Hi Chris,

Maybe not so odd that a fuel fill fixes it. As the tank fuel level falls, the gravity pressure on the tank outlet falls, so the pump is "sucking harder" and it is more likely to draw-in air from any less-than-perfect joint on the fuel line.
Cheers
Allan

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Follow Up By: Cruiser695 - Friday, Jun 17, 2016 at 14:08

Friday, Jun 17, 2016 at 14:08
That's a good point Allan.
I have a feeling that the fuel pump is inside the tank at the bottom, though I don't have a workshop manual to confirm that and nor could Mr Google!
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Follow Up By: Allan B (Member, SunCoast) - Friday, Jun 17, 2016 at 17:10

Friday, Jun 17, 2016 at 17:10
Chris,
If the fuel pump is submerged within the tank then what I suggested is not valid. It would not be able to suck air in through a dodgy fuel-line connection. The fuel line would be at pump pressure at all times.
Cheers
Allan

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Follow Up By: Member - DOZER - Saturday, Jun 18, 2016 at 17:55

Saturday, Jun 18, 2016 at 17:55
The most probable issue will be too much inlet restriction when tank is low, with 2 filters to suck through, the pump at the motor is doing it tough. Because all has been disturbed with the second filter install, check hoses by trying to turn them whilst clamped. Toyota Spring clamps don't usually work too well second time round.
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Reply By: tazbaz - Friday, Jun 17, 2016 at 11:18

Friday, Jun 17, 2016 at 11:18
It would help if you stated the type of vehicle!
AnswerID: 601454

Follow Up By: TomH - Friday, Jun 17, 2016 at 11:47

Friday, Jun 17, 2016 at 11:47
Would be reasonable to assume a 79 ser V8 is a Toyota ute as thats all Google throws up.
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Follow Up By: Flighty ( WA ) - Friday, Jun 17, 2016 at 12:35

Friday, Jun 17, 2016 at 12:35
And a 2013 model as well, lol

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Follow Up By: Cruiser695 - Friday, Jun 17, 2016 at 12:44

Friday, Jun 17, 2016 at 12:44
Apologies tazbaz, having spent so much of my life around Landcruisers I assume that if I mention a number between 40 and 80 everyone else knows what I'm on about!

It's a 2013 79 series dual cab Landcruiser workmate. 90K on the clock.
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FollowupID: 870923

Follow Up By: TomH - Friday, Jun 17, 2016 at 13:15

Friday, Jun 17, 2016 at 13:15
You missed a few Between 40 and 200 these days ROFL
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Follow Up By: Cruiser695 - Friday, Jun 17, 2016 at 14:00

Friday, Jun 17, 2016 at 14:00
I've not managed to get beyond 80 yet, in fact I'm now going backwards!
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Follow Up By: Kenell - Friday, Jun 17, 2016 at 18:07

Friday, Jun 17, 2016 at 18:07
I have a 76 Series and had a second fuel filter fitted last year. Went thru similar problems as air sucked into the system a few times before I found that the useless pressure clamps on the primary filter had not regained the pressure that should have prevented air getting into the system. I put some hose clamps on, re primed the system - all good. In some cases I understand a servo pump might be required on these motors after second filters are installed to ensure adequate pressures are maintained.
Hope this assists.

Kenell
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Follow Up By: Cruiser695 - Friday, Jun 17, 2016 at 19:46

Friday, Jun 17, 2016 at 19:46
Thanks Kenell.
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Reply By: MUZBRY- Life member(Vic) - Friday, Jun 17, 2016 at 14:18

Friday, Jun 17, 2016 at 14:18
Gday
You will be sucking air from a joint. Possibly at the new filter . Just make sure the hoses are tight but not over tight. If the filter bowl is not tight it will leak . If the threads are not sealed on the tails in the filter they will leak. Just check and tighten all things new on the fuel system.
Muzbry
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AnswerID: 601459

Reply By: Alloy c/t - Friday, Jun 17, 2016 at 14:39

Friday, Jun 17, 2016 at 14:39
Methinks you also have slight maths problem , you say 120lt tank took 106lt so you 'must' have had 24lt still in tank ….. 106 + 24 = 130 …. more likely you were down to 14lt and have a faulty low fuel warning light sensor , is almost impossible to actually get the last few litres from the tank except if you know exactly on what angle you need to have the vehicle sitting for the pickup tube to scavenge the fuel.
AnswerID: 601461

Follow Up By: pop2jocem - Friday, Jun 17, 2016 at 14:52

Friday, Jun 17, 2016 at 14:52
Yes maybe a bit of a maths problem or maybe understating the capacity of the fuel tank in a 79 series dual cab Land Cruiser. I'm pretty sure they are specced at 130 lt which means the 24 lt (approx) left is correct. Although as Bob Y said a single cab 90 lt spec tank gives about 80 lt usable. Well mine does in any case. I know, I ran it out (engine spluttering) and could only get 80 lt back in.
Cheers
Pop
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Follow Up By: Cruiser695 - Friday, Jun 17, 2016 at 19:44

Friday, Jun 17, 2016 at 19:44
Bad typing rather than bad maths. The fuel tank is specified as 130L.
I don't expect to get all 130L but leaving 24L behind seemed a lot.
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FollowupID: 870969

Reply By: Ozrover - Saturday, Jun 18, 2016 at 18:32

Saturday, Jun 18, 2016 at 18:32
Chris,
In my 2012 LC dual cab I regularly run it down till the warning light comes on, then I will occasionally drive up to 50ks more before filling it up, the most that I've put in is 115lts, that still leaves 15lts unused.

I've also got a prefilter fitted, & so far have never had a problem, so I'd guess that either a seal is sucking air at low tank fill, or a loose clamp somewhere in the line.
AnswerID: 601533

Follow Up By: Cruiser695 - Saturday, Jun 18, 2016 at 18:50

Saturday, Jun 18, 2016 at 18:50
Thanks Jeff, that's good information to have.
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FollowupID: 871046

Follow Up By: AlbyNSW - Sunday, Jun 19, 2016 at 05:24

Sunday, Jun 19, 2016 at 05:24
My experience is the same as Jeff's
If I fill up when the light first comes on it will take about 110 litres, I have pushed it further on a couple of occasions but have never managed to get 120 litres in a fill yet ( but not trying)

I don't think your problem is running out of fuel , just an air leak
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FollowupID: 871058

Reply By: pop2jocem - Sunday, Jun 19, 2016 at 11:57

Sunday, Jun 19, 2016 at 11:57
Cruiser,

Going by your statement that filling the tank cured the rough running I would say that the pickup in the tank was drawing air when the fuel level was low. I do think 24 liters basically unusable is getting a bit too cautious.
Re-filling the tanks isn't going to fix a loose fuel line connection which is drawing air.

Cheers
Pop
AnswerID: 601566

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