TD5 AIR BLEED VALVE in Fuel Filter

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CharlesY said:
Hi Guys,
I am repeating this reply with a new subject heading.


I have posted this info elsewhere but I'll give you a brief summary of what I discovered when I had fuel trouble recently. I replaced the said air-bleed valve which was blocked with ? but the aerated fuel problem persisted when low on fuel. I removed fuel pump and disassembled to reveal a fine filter on the bottom of the main pump. This was blocked with ? causing the pump to cavitate and draw air through the only part of the filter that was unblocked. This I guess was partly above the fuel level hence the air in fuel. Cleaned filter with household detergent and dried unit with compressed air. Reassembled and all is good including easy start and no howling pump
If this is off help to any other please don't hesitate to copy and post
Disco pump.JPG

Disco 2.JPG
Click to expand...
 
Been reading this for a while as nobody could find the fault with my disco td5 but it turns out a previous owner put an under powered battery on and when my mechanic put over a 1/4 off a tank fuel in it starts fine now, but says the fuel pickup pipe in the tank has a habit of dropping off, and can't get fuel, so cheapest fix, under a 1/4is empty
 
onion said:
Been reading this for a while as nobody could find the fault with my disco td5 but it turns out a previous owner put an under powered battery on and when my mechanic put over a 1/4 off a tank fuel in it starts fine now, but says the fuel pickup pipe in the tank has a habit of dropping off, and can't get fuel, so cheapest fix, under a 1/4is empty
Click to expand...

pickup for pump is on the bottom of pump which sits on the bottom of tank ,there are 2 pumps in one with the low pressure sitting at the bottom, id remove pump and see what fault was
 
Without seeing the guy tomorrow, he only said the early td5 there is a pipe about 2" in the tank, so I presume that's at the bottom.he's still got it and tried forward up hill down, hot and cold and starting perfect,i hope it helps, any further info would be great
 
early or late they are all the same,low pressure pump sits on bottom of tank,which is fed to filter then back to high pressure pump then to engine
 
Cheers buddy for your reply, forgot to mention he said a new fuel filter was badly needed to, would that also help, also I only do about 13 miles a week and run it low on fuel
 
hi this is my first to post , however have used this site many times and always good advice. just to start have recently sold my 300tdi after 12 yrs and bought a td5 a few months ago . parked it up last night all ok went out this morrnig and it would'nt start as if out of fuel . went through bleeding proces but still nothing , have changed the fuel pump in the tank and fitted new fuel filter , bleed system again three times and she started but cut out as if no fuel after three mins . have done this a few times now . any ideas please
 
all done , cleaned the air return valve and cut away the fine gause , gone through bleed process three times and my landy is back to life . thanks all , fab site
 
.....Just to add to all this, I have had a similar problem with my TD5 110. Finally got it started after following the instructions on here. (Many thanks people) But my fuel pump is still making a rather queer noise? Is this likely to be the bleed air return blocked, seems the most probable cause judging by your experiences....
 
CharlesY said:
Hi Guys,
I am repeating this reply with a new subject heading.






Hi Shifty,

Not a lot. Still poor to start this morning.
But that may be at least partly due to dodgy fuel.
Now hear this .

Discomania and I jacked up rear right and took off the wheel.

Then using a 19mm spaniard slackened the REAR OUTER pipe nut, that's the easy one on the LEFT looking at it, and nearest.

Undo it completely, and catch the copper washer.

Now examine the end of the pipe. Jammed into it is a small nylon plug thing with three holes in the end of it. Under the three holes is a small flat filter.
Under that is the tiny AIR BLEED HOLE.

All the time the TD5 fuel pump is running, any air in the filter head SHOULD vent THROUGH the little filter then through the little bleed hole, and be dumped back into the fuel tank through the far left connection along with some fuel.

So ... if the little filter in the nylon plug bleed device is blocked with dirt, NO AIR BLEED especially on a first start.

So what I did was carefully to prise the nylon plug thing out of the end of the pipe. It is help in by a small O-ring that comes out with it. Then I SPLIT the end off the thing using a sharp knife, and scraped off the filter thing which is there ONLY to stop the bleed hole from getting blocked - so the filter blocks instead!

The car was parked at about three o'clock, and it's quite cold here. It is now 21.45, and I just went out to start it up. It started better than it has done for WEEKS.

TD5 drivers ...be aware there's an automatic air bleeder hiding in the fuel filter and it can cause poor starting!

If anyone else looks at this, please post findings and news.

Charles Y
Click to expand...
Hello I have had the same starting issue with my 2002 TD5 defender and I found only one non- return valve was fitted from the factory and the rubber valve was not closing properly and I suspect this was causing the starting problems. I have now fitted two new valve assemblies to both rear filter stubs and now it starts like a dream, so after 16 years these rubber valves need replacing as a matter of maintenance.
 
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