air leak in 60 series???hHELP!!!

Post by **chiefboy** » Wed Oct 05, 2005 4:43 pm

hi guys, please help!! my friends 60 series cruiser dies on an incline when off roading. we then have to bleed the air out using the hand fuel pump before she fires again. safe to say it's sucking air in from somewhere. anyone heard of this before and know how to fix??? REALLY FRUSTRATING
other than that it's a trusty old diesel.

Post by **G_loomis** » Wed Oct 05, 2005 4:55 pm

I dont know if this will help...but here goes.

My 60 suffers the same problem...but only if I am under 1/4 tank. When the fuel level is below this and the incline is dramatic the fuel pickup obviously is not submerged by fuel...making the motor stop...Prime it up...it fires...runs like a wet dream until I poke it up a hill!

I have even tested this theory a few times on the dam wall at my parents place...full tank its fine...half tank its fine...under a 1/4 tank it dies!

Doesnt really bother me that much as all I have to do is make sure I have enough fuel in the truck...too easy!

Post by **G_loomis** » Wed Oct 05, 2005 4:58 pm

not to mention that if you had a airleak going up an incline...it would be fair to say that the airleak would still be there no matter what position the truck is in. So if it only does it when travelling up an incline I would say it definately has something to do with the fuel pickup!

Post by **vanzbrown** » Wed Oct 05, 2005 7:30 pm

Would this be an inherant problem with most 60's... Cuz come to think of it ive never come across this problem, but then again ive never been 4by'in on anything less than a full tank.

Interesting fact...

Post by **chiefboy** » Wed Oct 05, 2005 9:12 pm

thanks guys for your help. regarding 1/2 a fuel tank, we've tested this too. but it happens on full tank as well

you've given us something to think about, anyway. we will investigate more. thanks.

Post by **joel HJ60** » Thu Oct 06, 2005 2:59 am

This happends to my 60 as well. I was under the impression that is wa the fuel (being on the incline) draining back to the tank away from where it should be?? Maybe I'm wrong?

Post by **PeterO** » Thu Oct 06, 2005 12:06 pm

If it sucks air witha full tank you might have a crook pickup in the tank that is moving around when you point the nose in the air take the pickup out of the tank and inspect it for fatigue cracks etc.

Or drive the other way and only go down hill

Post by **sambo** » Thu Oct 06, 2005 1:34 pm

I started getting the same problem while 4wding in vic earlier this year, after bleeding the injectors about 10 times while trying to go up a long steep track i ended up calling a diesel guy ( luckilly i still had range).

He said it would be an air leek between the tank and the injection pump.
Ended up being in an old hose just before the fuel filter.

Look at all the flexible fuel line between the tank and the injection pump and if any of it appears to be old and perishing then replace it. Worst case scenarion bypass the entire fuel line and run a new one from the tank to the pump.

I replaced only a small section and the problem was fixed and has been good ever since.

Its good to know that i am not the only one who has had that problem.

Post by **joel HJ60** » Thu Oct 06, 2005 2:13 pm

So this isn't just a normal Diesel thing, there is a leak somewhere?

Post by **sambo** » Thu Oct 06, 2005 3:24 pm

correct, there has to be a leak somewhere.

When i first got the problem i immediately filled the tank to the brim by pumping from the aux tank, it still happened. Therefore if it is not sucking in air from in the tank, there has to be a hole in the line somewhere, its the only way for air to get in. The old line that ended up being the problem didn't leak. so don't check for fuel leaks, check for cracks in the line and signs that it is getting old and brittle.

Hope you fix it.
Sam

Post by **machh1** » Thu Oct 06, 2005 7:45 pm

G'day all... thx to Chiefboy for postin this prob for some ideas. Thx also to all who have givin feed back. Now its time I stopped procrastinating & did somethin aboutmy dilema. It actually used to happen also when the tank was almost empty, but for a long time now, it only happens when doin good inclines, & usually dies in the trickiest of situations. Thanks again.

Post by **Guy From Nowhere** » Sat Oct 08, 2005 10:37 am

Yeha I got that problem too. When I first got the truck I did the powerlin in the Brindies (ACT) and no wucken forries. Did it the other week and ass soon as I let revs drop down to idle it would stall. Mind you, this only happens on hills. I put it down to the drawer set I put in the back. I did some mad @rse drilling and reckon I gave something a small nick.

My question is why doesn't this happen on flat ground only on hills? Also, would this increase my fuel consumption as I noticed a pretty large increase after I put the drawers in (they don't weigh that much)? Mine is a petrol FJ60 1983/85.

Cheers
SANGA

Post by **joel HJ60** » Sat Oct 08, 2005 2:28 pm

Guy From Nowhere wrote:Yeha I got that problem too. When I first got the truck I did the powerlin in the Brindies (ACT) and no wucken forries. Did it the other week and ass soon as I let revs drop down to idle it would stall. Mind you, this only happens on hills. I put it down to the drawer set I put in the back. I did some mad @rse drilling and reckon I gave something a small nick.

My question is why doesn't this happen on flat ground only on hills? Also, would this increase my fuel consumption as I noticed a pretty large increase after I put the drawers in (they don't weigh that much)? Mine is a petrol FJ60 1983/85.

Cheers
SANGA

My question as well!?

Post by **joel HJ60** » Sat Oct 08, 2005 3:12 pm

http://www.outerlimits4x4.com/PHP_Modul ... hp?t=55572
Could these be related? The priming pump? Or would it be in the fuel lines somewhere?

Post by **carts** » Sat Oct 08, 2005 4:20 pm

joel HJ60 wrote:
Guy From Nowhere wrote:Yeha I got that problem too. When I first got the truck I did the powerlin in the Brindies (ACT) and no wucken forries. Did it the other week and ass soon as I let revs drop down to idle it would stall. Mind you, this only happens on hills. I put it down to the drawer set I put in the back. I did some mad @rse drilling and reckon I gave something a small nick.

My question is why doesn't this happen on flat ground only on hills? Also, would this increase my fuel consumption as I noticed a pretty large increase after I put the drawers in (they don't weigh that much)? Mine is a petrol FJ60 1983/85.

Cheers
SANGA
My question as well!?

Its a simple case of physics. In the 60 series, there is no fuel pump in the tank, only at the motor end. On flat ground, the effort required by the fuel pump to get fuel to the motor is fairly minimal. The pump acts like a straw, sucking fuel to the motor, rather than being pushed, like modern efi cars with high pressure pumps in the tanks. As soon as you put the car on an incline, the effort required by the pump to suck fuel from the tank to the pump is greatly increased. Any rubber lines have the capacity to get a vacuum created in them, and partially collapse. If the rubber lines are perished and cracked, and air can get in, then you will get air in the lines, because the pump will find it easier to suck air in through crook hoses rather than suck kg's of fluid up the fuel lines. On flat ground, the pump finds it much easier to suck fluid, so there is not enough of a vacuum in the fuel lines to suck air in.

If you have a leaking fuel primer, air can get in through buggered seals under this condition also. Its is less likely to happen under normal driving conditions.

As for the petrol FJ60 coughing and spluttering in low revs on hills, this is quite normal, and a little harder to diagnose than diesels. It could be a fuel flow related issue like in the diesels, but it is more likely to be a carburettor issue. The floats dont work quite as efficiently on hills as they do on flat ground, so have the capacity to either starve the motor of fuel, or completely flood it. Some guys I know resort to having the choke on when climbing steep hills to get a good flow of fuel. LPG is a great solution for carburettor issues on hills!

Post by **Guy From Nowhere** » Sun Oct 09, 2005 1:50 pm

Tops

Post by **60seriesasthmatic** » Thu Nov 05, 2009 10:14 pm

The diesel return line from the injectors goes directly back into the injector pump and if the little piece of flexible line between the pump and the return line has cracked or developed a leak it will feed air srtaight back into the injector pump thus making it die.

Replace this piece of fuel line and your problem may be fixed.

Post by **Shadow** » Fri Nov 06, 2009 4:58 pm

dont be a tight arse and replace one piece of fuel line, if one is deteriorated the others wont be far behind it.

replace ALL the rubber fuel lines, will cost you about $10.

In my 60 series the problem ended up being a rusted water seperator letting air in on hills.

Post by **harlequin** » Fri Nov 06, 2009 9:37 pm

another possibility my hj60 would die at idle on a 20 degree slope when tank got under half full i could see a tiny wet patch on one of the delivery valves on the pump they had become loose so undone the clamps re tightened them a little bit re tighten clamps leak gone and does not stall at all now andy

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air leak in 60 series???hHELP!!!

air leak in 60 series???hHELP!!!

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