Fuel pipe from pump to rail on 806

HELP. My Peugeot 806 1999 HDI model had a new pump etc before we
bought it. However, 4 weeks after we bought it, it sprung a diesel
link at the union on the pipe from the pump to the diesel rail (at the
rail end). The Green Flag man tried to tightened it (but I suspect
overtightened it) and couldn`t, after many attempts, stop it leaking.
I bought a new pipe (£7) and fitted it, not tightening it too much...3
days went fine with no leaks. However, today, it`s started leaking
again...now what? Do I retighten it and can I use threadlock to stop
it loosening again? The engine does vibrate but I wouldn`t say it was
excessive.....how tight can I go???....TIA.....

 

Use a good thread lock,and yes u can do it up a bit more but be careful.

 

HELP. My Peugeot 806 1999 HDI model had a new pump etc before we
bought it. However, 4 weeks after we bought it, it sprung a diesel
link at the union on the pipe from the pump to the diesel rail (at the
rail end). The Green Flag man tried to tightened it (but I suspect
overtightened it) and couldn`t, after many attempts, stop it leaking.
I bought a new pipe (£7) and fitted it, not tightening it too much...3
days went fine with no leaks. However, today, it`s started leaking
again...now what? Do I retighten it and can I use threadlock to stop
it loosening again? The engine does vibrate but I wouldn`t say it was
excessive.....how tight can I go???....TIA.....
The fuel pressures in this pipe are very high indeed. Thus you will need to
tighten the union quite a bit. It would not be unusual for a new pipe union
to "bed in" a little when new, so just tighten the nut another quarter turn,
or just even one flat on the nut. I doubt it is actually undoing itself, so
there is probably no need for thread locking compound.
Are you certain that the rail is not damaged causing the leak.

 

Hi, thanks for the replies. Can`t rule out the rail but replacing the
pipe cured it, albiet for a short time. I`ve tightened the union nut,
a little (not as much as said here) and it`s cured it again. I
appreciate that pressures are high and the union nut shouldn`t work
loose... I`d also noticed, as had the Green Flag man , that the actual
length of the nut up against the rail on the old pipe was touching and
thus at max turns and so no more turns were possible...this wasn`t
true at the other end (pump end)..plenty off travel
left.....anyway...it`s "cured" for now so I`ll keep my eye on it...or
nose!!!!! Hate plumbing too!!!

 

HELP. My Peugeot 806 1999 HDI model had a new pump etc before we

Hi, thanks for the replies. Can`t rule out the rail but replacing the
pipe cured it, albiet for a short time. I`ve tightened the union nut,
a little (not as much as said here) and it`s cured it again. I
appreciate that pressures are high and the union nut shouldn`t work
loose... I`d also noticed, as had the Green Flag man , that the actual
length of the nut up against the rail on the old pipe was touching and
thus at max turns and so no more turns were possible...this wasn`t
true at the other end (pump end)..plenty off travel
left.....anyway...it`s "cured" for now so I`ll keep my eye on it...or
nose!!!!! Hate plumbing too!!!
If the nut is "bottoming" on the thread, then it might be that you are
unable to tighten it enough. In which case it should be possible to take the
pipe off, and carefully file the nut edge to allow more clearance.

 

Update..a few months have now passed and after taking the car to a
garage to look at, the leak was sorted for a while. However, it has
now started to leak AGAIN!! I`m at my wits end as to what to do. I`m
going to buy another pipe (they`re cheap enough) and fit it. But why
is it doing this?Is it a known fault? Is there any other solution to
this? Weld it on? Pump end union is fine and always has been. Could it
be the rail?...it has been checked....if need be, I`m going to buy a
new one (bit more expensive I guess!). Is it worth paying Peugeot to
fit the new pipe and put the onus on them to sort it??Please, any help
or solution to this would be very much appreciated..it`s driving me
NUTS!!!

 

Update..a few months have now passed and after taking the car to a
garage to look at, the leak was sorted for a while. However, it has
now started to leak AGAIN!! I`m at my wits end as to what to do. I`m
going to buy another pipe (they`re cheap enough) and fit it. But why
is it doing this?Is it a known fault? Is there any other solution to
this? Weld it on? Pump end union is fine and always has been. Could it
be the rail?...it has been checked....if need be, I`m going to buy a
new one (bit more expensive I guess!). Is it worth paying Peugeot to
fit the new pipe and put the onus on them to sort it??Please, any help
or solution to this would be very much appreciated..it`s driving me
NUTS!!!
At this point in time it might be worth talking to your local Peugeot
Stealer.