C

C13tay1

Active Member
friend of mine has recently bought a late model td5 landmark.

Had a few rough running issues which were cured by replacing injector loom.

All was well until other Tay car cut out .... Tank was quarter full. Got it home and spoke to local indie. He suggested pump. New pump ordered. In the meantime the tank was brimmed and car ran perfectly...... Until tank reached quarter full level when it cut out again. Filled it up and all ok again. We noticed that when full all ok. When it gets to half full it sometimes runs a bit rough.... And at quarter full stops again.

New pump fitted now but still same problem

Anyone else had this issue ...??

Cheers

Chris
 
vacuum formed in tank? tank sender float getting stuck in tank? crap clogging filter on the bottom of the tank?

is it actually a 1/4 full and not empty?
 
Thanks for reply trax

Just had pump out again and clean as a whistle. Lots of fuel in tank too.

Vacuum could be possible.....math inking about it there was a big suck when we took filler cap off

Will try it with a different filler cap ???


Chris
 
C13tay1 said:
Thanks for reply trax

Just had pump out again and clean as a whistle. Lots of fuel in tank too.

Vacuum could be possible.....math inking about it there was a big suck when we took filler cap off

Will try it with a different filler cap ???


Chris
Click to expand...

if it's that, then yeah a new cap would work.

take it for a spin until it does it again and conks. try starting it again.

if it doesn't start, take cap off and see if it sucks air in, put cap back on and see if it now starts. if it does then that's probably it.

you can always make a lil hole in it while waiting for the new cap
 
Will do.......... Well if they the same cap as a 300 tdi , got 2 old mot failures sat here I can take cap off

Fingers crossed

Cheers
 
the D2 doesn't breathe through the cap, it has a special breather system which actually can be clogged or the part pointed with the red arrow used to get burked... you can find it if you crawl under the car coming out from the filler side of the tank toward the front
Fuel tank and breather
The fuel tank and breather system is a major part of the fuel delivery system. The fuel tank and breathers are located
at the rear of the vehicle between the chassis longitudinals.

Fuel tank breather system
The filler tube incorporates a tank vent which allows air and fuel vapour displaced from the tank when filling to vent to
atmosphere via the filler neck.
A breather spout within the tank controls the tank 'full' height. When fuel covers the spout it prevents fuel vapour and
air from escaping from the tank. This causes the fuel to 'back-up' in the filler tube and shuts off the filler gun. The
position of the spout ensures that when the filler gun shuts off, a vapour space of approximately 10% of the tanks total
capacity remains. The vapour space ensures that the Roll Over Valve (ROV) is always above the fuel level and vapour
can escape and allow the tank to breathe.
The ROV is welded on the top surface of the tank. The ROV is connected by a tube to the filler tube, which in turn is
connected to the atmospheric vent pipe. The ROV allows fuel vapour to pass through it during normal vehicle
operation. In the event of the vehicle being overturned the valve shuts off, sealing the tank and preventing fuel from
spilling from the atmospheric vent pipe.
Click to expand...

IMO that's the area to investigate, double click on teh attachment to magnify
 

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Last edited:
sierrafery said:
the D2 doesn't breathe through the cap, it has a special breather system which actually can be clogged or the part pointed with the red arrow used to get burked... you can find it if you crawl under the car coming out from the filler side of the tank toward the front


IMO that's the area to investigate, double click on teh attachment to magnify
Click to expand...

Similar to the D1 then, well at least the petrol-engine 300 series (i've never seen a Tdis system) but the drawing u provide is identical to the D1s. as shown in the parts book.
You can't vent an area unless there's incoming air supply that is where the design and function of the fuel filler cap comes into play.
 
Last edited:
discool said:
Similar to the D1 then, well at least the petrol-engine 300 series (i've never seen a Tdis system) but the drawing u provide is identical to the D1s. as shown in the parts book.
You can't vent an area unless there's incoming air supply that is where the design and function of the fuel filler cap comes into play.
Click to expand...
:frusty::eek: ... thank you for putting me in the right direction and SORRY for the rest of posters/OP...i misunderstood the whole thing from the beginning ... re-reading everything i realised that yes, the cap can be the problem here
The filler cap has a valve
which relieves fuel pressure to atmosphere at approximately 0.12 to 0.13 bar (1.8 to 2.0 lbf.in 2 ) and opens in the
opposite direction at approximately 0.04 bar (0.7 lbf.in 2 ) vacuum.
Click to expand...

nobody's perfect:doh:
 
Interesting :) this info along with the other stuff u posted is no printed in the D1s copy of Rave... so thanks.
When I remove the cap on my tank on a hot day there is a 'wooosh; sound of air, that's maybe be a petrol thing as i also happens on other cars I have and they all have vented fuel caps.


The filler cap has a valve
which relieves fuel pressure to atmosphere at approximately 0.12 to 0.13 bar (1.8 to 2.0 lbf.in 2 ) and opens in the
opposite direction at approximately 0.04 bar (0.7 lbf.in 2 ) vacuum.
 
discool said:
Interesting :) this info along with the other stuff u posted is no printed in the D1s copy of Rave... so thanks.
When I remove the cap on my tank on a hot day there is a 'wooosh; sound of air, that's maybe be a petrol thing as i also happens on other cars I have and they all have vented fuel caps.


The filler cap has a valve
which relieves fuel pressure to atmosphere at approximately 0.12 to 0.13 bar (1.8 to 2.0 lbf.in 2 ) and opens in the
opposite direction at approximately 0.04 bar (0.7 lbf.in 2 ) vacuum.
Click to expand...

whoosh/hiss out is normal, sucking in hiss/whoosh isn't :D
 
trax said:
vacuum formed in tank? tank sender float getting stuck in tank? crap clogging filter on the bottom of the tank?

is it actually a 1/4 full and not empty?
Click to expand...
float arms getting restricted or bent with poor fitting is quiet common
 
sierrafery said:
the D2 doesn't breathe through the cap, it has a special breather system which actually can be clogged or the part pointed with the red arrow used to get burked... you can find it if you crawl under the car coming out from the filler side of the tank toward the front


IMO that's the area to investigate, double click on teh attachment to magnify
Click to expand...

that still breaths through cap though doesnt it
 
yes it does.... i standed corrected and apologised for my mistake... it was the side effect of some beer;)
 
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