ametlib: Good for you! It must feel so satisfying after such a long time to finally get it fixed! I'm very curious about your solution :)
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ametlib: Good for you! It must feel so satisfying after such a long time to finally get it fixed! I'm very curious about your solution :)
Yes, as i said I had a feeling that Crasher was preety close.
I opened both sides of the fuel tank and drained it totally, then pulled everything out and at first couldn't find anything suspicious.
Then, just to see how things worked, I filled each side of the tank with 5L diesel and runned the pump from fuse 28.
At first all looked ok, but when the suction jet pump had emptied the tanks left side, the suction jet pump's return hose started to push air in the outer part of the baffle chamber.
This happened in pulses with 3-5 sec. intervals.
At the same time the clear hose from the tank fuel pump was filled with air bubbles...
To check if this air made it's way to the engine I fitted a clear hose to the feed hose going to the filter/ engine, bled the system and started the engine.
At idle, nothing, but at some revs, the hose was filled with small air bubbles !
More revs-more air bubbles.
Ok, everything vent out again, and this time I noticed a 3-4 mm hole in the grey return hose from the suction jet pump.
It,s perfectly round, placed perfectly on top of the hose 12-15 cm from the baffle chamber.
There is no hole there anymore :D,
the suction jet pump is still pushing air into the outer part of the baffle chamber, but in a continious stream, and no air is getting to the tank pump- and the engine is running lovely !!!
About the Engine speed sensor- the day before I changed it I filled the tank to the brim ( cheap diesel ;))
This was actually the second time I,ve seen this tank full, the first time was when I bought it. ( hmm, wonder why?:biglaugh:)
So as long as the diesel level was above this hole, everything was ok, level below- barking
Well, congratulations! :)
Now, may i uncover the baffle chamber when i have between half and one quarter tank level, or do i have to run it down to one quarter ?
I really dont want diesel fuel inside my car :)
I am now very qurious of what i`ll find in my tank. :)
Forgot a couple of things.
I want to thank all of you who helped me figure this out, Crasher, PaulF, Adamss, Sjordet, Matkring, Charles Elliott and Ceilidhalfie , Thanks a lot guys !
Second thing, why did my engine run ok after I changed the fuel filter ?
Whenever I change a fuel filter I make sure it's filled with diesel fuel all the way up, and since the pick up ( on the engine side) is located a bit down ( 5-7 cm) in the filter housing, the space above the pick up will work
as an " air trap"
But as soon as the " air trap" is filled with air, the air will start to go into the Injection Pump ( in my case that took around 10 km ) and the good old "bark" will be back....
When I started this thread I knew this was something special and I must say this was a bugger,
and to use a year to find air in the fuel lines is madness.
The problem was I fooled myself with cheap injectors from ebay ( wich I'm sure have wrong nozzles) and focused on the weird readings in measuring blocks 14,
and ofcourse the fact that there was no air in the fuel line at idle.
Well, thanks again, and as Adamss said, I got there in the end :beerchug:
I'm really not sure how low the tank level should be.Quote:
Originally Posted by Matkring
I drained 20 L out of the feed line to the webasto, and when I opened up the two covers, the right side had only a few liters left when the left side was around 1/2 to 3/4 full.
Since I wanted to check for water or debris I then drained both sides compleatly, but there was nothing in there, just clean diesel fuel.
Also noticed that the right side ( baffle chamber side ) had paint markings and was probably opened before.
Have a feeling that the hole in the grey hose was punched at the VDO factory, but that the hose is put in the wrong way.
Now the hole is placed right after the top point when the fuel from the suction jet pump starts to run downhill,
but if you turn the hose around, the hole would be right after the suction jet pump, when the fuel is pushed uphill. Is the intention with this hole to let air out of the hose ?
Anyway, good luck and use gloves
ametlib: Did you notice any performance gains? I guess you should, when you got rid of the air in the fuel... :)
Yes, definitly.
It's now running a good bit better than stock AKE, and I have a feeling it has something to do with the injector nozzles ;)
Matkring, just out of couriousity, did you manage to sort this out ?
Well, I'm not really sure. It seems much better, but if I drive with windows closed, it sounds like it's barking. Maybe I have leaks in the exhaust, maybe it's in my head. I checked in the tank, but found nothing wrong. I also tried the trick you tried with the 5l tank in air filter box, but the sound from the air intake gave me a hard time listening. The blank hose from filter to pump is not present on mine. I have to replace it with a new one. Update will come as soon as I have a more reliable answer :-)
I would like to know if you are 100% sure the in tank circulation pump is running when the engine is?