fuel vent system anatomy

[afischer]

Hello,

Does anyone truly understand the fuel vent hoses or have a diagram for a 84 BJ60. I have, what I believe is a clogged vent line. Right now I am driving around without a fuel cap, but what like to resolve vent clog so that I can put the cap back on.

Thanks

 

[brownbear]

If you open the rh side cargo area you will see all the tubes. Very crazy looking. Also underneath on the rh side behind the wheel there is a cover. Pull the cover and look from the inside, hopefully you can spot something wrong. Or maybe an area to try blowing air into.

 

[roscoFJ73]

Hello,

Does anyone truly understand the fuel vent hoses or have a diagram for a 84 BJ60. I have, what I believe is a clogged vent line. Right now I am driving around without a fuel cap, but what like to resolve vent clog so that I can put the cap back on.

Thanks

All 60/62 are the same around the tank except Australian and General models which have a check valve near the fuel evaporative separator,according to the FSM

I would get an air hose with not too much pressure and disconnect the hoses one by one and blow some air through

 

[lostmarbles]

Hello,

Does anyone truly understand the fuel vent hoses or have a diagram for a 84 BJ60. I have, what I believe is a clogged vent line. Right now I am driving around without a fuel cap, but what like to resolve vent clog so that I can put the cap back on.

Thanks

Maybe we should find out why you think you have a clogged vent line first?

It is normal for the fuel tank to be under vacuum if my BJ40 is anything to go by.

 

[afischer]

I have fuel delivery problems if i leave the fuel cap on. It seems as if, when running with the cap on, that the fuel supply gets constricted. I first thought it was the sedimenter...changed it out, replaced the primer pump, but the car would still stall out from lack of fuel. I took the gas cap off and it has been running fine ever since. I suspect a vent clog. Could it be anything else, like the suction tube in the tank?

 

[lostmarbles]

..... but the car would still stall out from lack of fuel. I took the gas cap off and it has been running fine ever since. ....

Hi afischer
When you ran it with the cap on, you say it "stalled out". (spluttered and died). ---Did you also often have trouble starting it AND KEEPING IT RUNNING next morning (even when it hadn't "stalled out" the previous day)? If YES, what I would really like to know is, apart from removing the fuel cap, did you have to bleed air from the fuel system before being able to get it restarted and running properly again?

If you didn't, then I think you're on the right track by looking for "blocked fuel tank venting". But if you had to bleed air, then I suspect a pinhole-sized leak in the fuel lines "between the tank and the fuel pump inlet" instead.

 

[roscoFJ73]

I have fuel delivery problems if i leave the fuel cap on. It seems as if, when running with the cap on, that the fuel supply gets constricted. I first thought it was the sedimenter...changed it out, replaced the primer pump, but the car would still stall out from lack of fuel. I took the gas cap off and it has been running fine ever since. I suspect a vent clog. Could it be anything else, like the suction tube in the tank?

Does it stall,splutter or just lose power? Have you tried putting the cap back on? Maybe the problem has cleared itself.

The suction tube is the one on the fuel pick up ,right? If that was blocked I think you would have problems all the time but its worth checking if you want to go right through it.

Heres how I would do it. Let the fuel in the tank get low. Blow all the fuel back to the tank via the fuel line to the pump, ditto all the other fuel lines. Check and clean the fuel pick up,the 60 series has a plate on the rear floor for access.
Then empty and dispose of all the fuel in the tank.
If your pump has a mesh screen inside like the rotary pumps,check that too.

Fill with fresh fuel and prime the fuel system.

 

[afischer]

I did pump he primer, though I am not sure if i needed to or not. However, it appeared as if the fuel line was empty. The lines are fairly rusted by the tank, although they were tested and proved to be leak proof.

Also, i ran a couple tanks of biodiesel, which make me think that some sludge or rust rust was dislodged and is clogging the system.

 

[afischer]

Does it stall,splutter or just lose power? Have you tried putting the cap back on? Maybe the problem has cleared itself.

It sputtered a bit lost power and then stopped. I cranked it a couple time it started up...i drove it home where it would not start at all after cranking several times.

the next morning i took off the gas capped primer it and it has been running ever since.

 

[roscoFJ73]

If you have rust anywhere inside a diesel fuel system you can expect on going drama's.
Have you checked the fuel filters for any visible signs of rust etc?

If your fuel lines are empty then you have a leak.

 

[lostmarbles]

.......I did pump he primer........it appeared as if the fuel line was empty................

This makes me think the problem isn't anything to do with your fuel tank venting system EVEN THOUGH you solve your problem (for now) by removing the cap.

 

[lostmarbles]

It sputtered a bit lost power and then stopped. I cranked it a couple time it started up...........

Well if it started up here without you needing to bleed air, then that tends to contradict my idea about air entering via a pin-hole leak on the fuel pump's suction side.

(Because my experience is that; if air has entered in sufficient quantity to stall the motor, such a large amount would seldom "purge itself through the system" simply by cranking the engine over.)

Perhaps you do indeed have debris in the fuel line (or in any filters/strainers within it) that is restricting the fuel flow. ----And removing the tank cap adds sufficient pressure (from the atmosphere) to push enough fuel past the blockage?

And then of course there is the possiblity you're already exploring of "blocked tank venting", but I'm reluctant to accept that one because it is such a rare problem. (Can anyone dispute that it is rare????)

 

[roscoFJ73]

And then of course there is the possiblity you're already exploring of "blocked tank venting", but I'm reluctant to accept that one because it is such a rare problem. (Can anyone dispute that it is rare????)

I would have to agree its rare. It would be a long way down my list.
The last 3 similar situations Ive seen have all been from

Air entering the system

Blockages in the fuel pick up

Blockages in the solenoid fuel valves on dual tank models.

Now I just went out and tried something on the fuel cap of my 73 series which has the small type of cap.

If you put your mouth over the fuel tank end of the cap you can suck air in but you cannot blow it out.
You can definitely feel a valve working inside.
So the fuel cap,mine anyway,makes it impossible to get any vaccum in the fuel tank.
The cap suits all 40 60 and 70 series models and both fuels
Now I got that diesel flavour in my mouth

 

[lostmarbles]

..............If you put your mouth over the ..............the cap you can suck air in but you cannot blow it out.................Now I got that diesel flavour in my mouth

Aghhhhh. I might be fussier about where I put my mouth than you Rosco. Not sure I wanna try that!

But if I tested mine I suspect the result would be different because when I take off my cap, there is often a big inrush of air. (Fuel that is - I don't wear a cap!)

But fitting a cap like yours could solve afischer's problem - Even if it may be only a temporary solution till some blockage worsens (IF indeed such a blockage exists).

 

[afischer]

ok, I think I'll try it ll over again.... put the cap on an see if the problem repeats itself. The cap I have isn't the kind that allows me to suck air out of the tank versus blow air in. maybe one of these would solve the problem. i did get a new cap a while back and maybe the old cap wasn't sealing properly and allow air through.

 

[afischer]

Blockages in the fuel pick up

hmmm the fuel pick up. would that be anywhere between the tank and the injector? or, would that be inside the tank?

 

[roscoFJ73]

hmmm the fuel pick up. would that be anywhere between the tank and the injector? or, would that be inside the tank?

In the tank. You can get access under the carpet in the rear through the floor I believe.

 

[Diesel Weasel]

In the tank. You can get access under the carpet in the rear through the floor I believe.

Actually, only the fuel level float is accessible through the panel under the carpet. The actual pickup is in the top-right corner of the tank.

 

[roscoFJ73]

Aghhhhh. I might be fussier about where I put my mouth than you Rosco. Not sure I wanna try that!

But if I tested mine I suspect the result would be different because when I take off my cap, there is often a big inrush of air. (Fuel that is - I don't wear a cap!)

But fitting a cap like yours could solve afischer's problem - Even if it may be only a temporary solution till some blockage worsens (IF indeed such a blockage exists).

He should have a cap like mine as it is for all 45,47,60 and 70n series. The cap is actually dry and the taste was only mild.

ok, I think I'll try it ll over again.... put the cap on an see if the problem repeats itself. The cap I have isn't the kind that allows me to suck air out of the tank versus blow air in. maybe one of these would solve the problem. i did get a new cap a while back and maybe the old cap wasn't sealing properly and allow air through.

The cap will allow pressure to build but will not allow vaccum.I wasnt sure if you were sure on that

This is what I am using

http://cgi.ebay.com.au/TOYOTA-LANDC...ryZ10428QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

 

[roscoFJ73]

Aghhhhh. I might be fussier about where I put my mouth than you Rosco. Not sure I wanna try that!

But if I tested mine I suspect the result would be different because when I take off my cap, there is often a big inrush of air. (Fuel that is - I don't wear a cap!)

But fitting a cap like yours could solve afischer's problem - Even if it may be only a temporary solution till some blockage worsens (IF indeed such a blockage exists).

He should have a cap like mine as it is for all 45,47,60 and 70n series. The cap is actually dry and the taste was only mild.

ok, I think I'll try it ll over again.... put the cap on an see if the problem repeats itself. The cap I have isn't the kind that allows me to suck air out of the tank versus blow air in. maybe one of these would solve the problem. i did get a new cap a while back and maybe the old cap wasn't sealing properly and allow air through.

The cap will allow pressure to build but will not allow vaccum.I wasnt sure if you were sure on that

This is what I am using

http://cgi.ebay.com.au/TOYOTA-LANDC...ryZ10428QQssPageNameZWDVWQQrdZ1QQcmdZViewItem