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

Submitted: Friday, Jun 17, 2016 at 10:30

ThreadID: 132771 Views:10311 Replies:6 FollowUps:17

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Cruiser695

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

Seen it all, Done it all.
Can't remember most of it.

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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.