306 DTurbo fuel back siphoning?

Somehow overnight the fuel in our DTurbo has started back siphoning
into the diesel tank when the car is left for any substantial period
of time (only seen overnight).

We can pump the fuel back into the line using the hand pump in the
engine bay but this is a bit tedious everytime we want to use the car!

Any ideas? I thought air leak somewhere or a faulty non-return valve
but I don’t know how the fuel system is set up on a 306 DTurbo!

Thanks in advance

 

sounds like air leaking in to the fuel lines,
one of the most common areas for this leak is the filter bowl,
I had a similar thing on my 405 some time ago, turned out to be the seal
below the filter bowl,

Fitzy

 

Admittedly a completely different car, but I had a similar problem on a
405 diesel a few years ago. It took ages to find, and turned out to be a
pinhole in the plastic fuel line. It rubbed slightly against the body at
the point where it left the body to head towards the engine, leaving a
small enough hole to admit air, but not big enough to cause a puddle of
fuel. It could be worth having a feel around similar areas.

Matt

 

needs a new manual primer pump, (the pump you are using to feed the fuel
back in).
This incooperates a one way valve which prevents fuel returning to the tank.
obviously this valve is leaking.
regards.
Steve.

http://www.autoforumz.com/eform.php?p=586231

 

can be tested by removing said pump