Classic 1988 EFI, converted to 200TDI, Fuel tank issues

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On mine (89 originally a VM) the breather runs above the filler pipe and has an extension off the top (5 in this pic) which is clipped to the inside of the wing, near the filler door. Fuep supply and return are in the top of the tank and sender is mounted on the side
 

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Kev12 said:
On mine (89 originally a VM) the breather runs above the filler pipe and has an extension off the top (5 in this pic) which is clipped to the inside of the wing, near the filler door. Fuep supply and return are in the top of the tank and sender is mounted on the side
Click to expand...
Thanks very much Kev, I'd found that diagram with a Google image search, but no explanation of the numbers, so the 5 is potentially invaluable!
 
No worries, should add mine has the lower level filler flap (as I think yours does looking at your profile pic) the arrangement must be a little different for the higher flap
 
Kev12 said:
No worries, should add mine has the lower level filler flap (as I think yours does looking at your profile pic) the arrangement must be a little different for the higher flap
Click to expand...
It does indeed, time to get the lines blown through tomorrow in hopes of avoiding another trip to the garage!
All this was in an effort to avoid spilling diesel on the drive changing the old leaky tank and lines. It'd have been easier to spill a whole tank of diesel and clean it off with a toothbrush in hindsight!
 
Next update:
Runs fine with no fuel filler cap on
Runs fine if I split the join in the breather where the garage has joined the new hose (tank to join) to the old hose (join to up near the top of the filler neck).
So, the old breather hose is blocked above the point where they've connected it to the new hose.

Why are some garages such bloody cowboys? :mad:
 
jwrrc said:
Next update:
Runs fine with no fuel filler cap on
Runs fine if I split the join in the breather where the garage has joined the new hose (tank to join) to the old hose (join to up near the top of the filler neck).
So, the old breather hose is blocked above the point where they've connected it to the new hose.

Why are some garages such bloody cowboys? :mad:
Click to expand...
Cos they're working on injuns. Sorry I'll get my coat.:oops::D
 
jwrrc said:
Next update:
Runs fine with no fuel filler cap on
Runs fine if I split the join in the breather where the garage has joined the new hose (tank to join) to the old hose (join to up near the top of the filler neck).
So, the old breather hose is blocked above the point where they've connected it to the new hose.

Why are most garages such bloody cowboys? :mad:
Click to expand...
I've edited that for you:rolleyes::)
 
So today, I split the breather at the point where they'd joined the new hose to the old, found that the hose was a little too large for the nozzle I had so I couldn't blow it through with my small compressor, so with it disconnected I pushed some cable through from the top. **** came out into the waiting bowl I had out. Car now runs fine. No vacuum in the tank.

The garage that did the tank said they thought the breather was fine, so the tank might need to be modified with an additional breather. Essentially, anything to charge more money rather than finish the job they half-arsed.
 
Today's update:
Took it on a longer run today, and there is a vacuum building in the tank. It's much weaker than before, so cleaning out the breather has helped, but not totally resolved it.

So either, the breather isn't completely clear, or the tank isn't capable of breathing enough for a 200TDI. It's a new EFI tank, so that's a vague possibility.

Planned next step is to try to breather a bit cleaner, in the hopes of avoiding modification to the tank.

Bugger.
 
jwrrc said:
Today's update:
Took it on a longer run today, and there is a vacuum building in the tank. It's much weaker than before, so cleaning out the breather has helped, but not totally resolved it.

So either, the breather isn't completely clear, or the tank isn't capable of breathing enough for a 200TDI. It's a new EFI tank, so that's a vague possibility.

Planned next step is to try to breather a bit cleaner, in the hopes of avoiding modification to the tank.

Bugger.
Click to expand...
Is the "joint"a one way valve?
 
Today's update (now the snow is gone and I'm back to grovelling under the car!) Now with pictures.

Here's the old and new hose joined by a cowboy and the join:
IMG_20211201_120101289.jpg
IMG_20211201_115940861.jpg


I've run a pipe cleaner through the old section of breather, and it's clear between the filler neck and the join. To my mind, that just leaves the bit of pipe that sticks up over the filler neck with a hose on, which I can't seem to get to:

IMG_20211201_115904286.jpg


I'm now weighing up whether to remove the whole filler neck and see if I can clean it properly off the vehicle, or buying a new one.

Any thoughts or advice welcome as ever!
 
Just had a thought….
If them 2 pipes are linked,both go into the tank so even if the small 1 was blocked it should still allow air via the larger pipe.(or does that small pipe go to the out side)

could your fuel cap breather be blocked then?
 
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