Many thanks for you advice - after looking around at other places on the net I am now convinced the the Diaphragm is the problem. One question - is this a DIY job or should I get myself hosed again at a garage? Looking in the Haynes book; removal of the fuel pump appears to be a nightmare involving the use of a 'Land Rover Special Tool' This alone make me shudder at the potential cost involved - especially if I balls it up and have to pay a pro to get me out of it. Again any advice would be most welcome.
Thanks Mark
> > > Twas Sun, 4 Apr 2004 15:06:49 +0000 (UTC) when "Mark Cable"
> > > put finger to keyboard producing:
> > >
> > > >Hi all,
> > > >
> > > > I own a 1990 90 turbo diesel and have encountered the following > > problem.
> > > >Local journeys are fine but if I travel 20 miles or more at a fairly
> > > >constant speed (50-60ish) pressure builds up inside the fuel tank, this
> > > >eventually leads to some type of fuel starvation from the engine which
> > packs
> > > >up. I solve the problem but taking the filler cap off and releasing the
> > > >pressure (the pressure is enough to blow the filler cap half way across
> > the
> > > >road). This got worse when I tried this trick after filling with fuel -
> > > >about 2 pints of diesel erupted from the tank!! I have replaced the > > filler
> > > >cap as I thought that perhaps it had a breather in it but this has made
> > no
> > > >difference. Does anyone have any idea what causes this and what the > > solution
> > > >would be? Any help would be appreciated. Many Thanks.
> > > >
> > >
> > > blocked breather pipe, look underneath, big pipe is the main fuel pipe
> > > from filler to tank, little pipe with it is the breather.
> >
> > I wonder if that is one of those where the boost pressure finds it's way
> > into the tank through a split diaphragm.
> > --
> > Jon
> >
>
> Definately worth checking the diaphragm in the plenum chamber on top of the
> fuel pump. It is pressurising positively which makes a blocked breather seem
> unlikely, the filler cap valve is designed to prevent a vacuum as the fuel
> level in the tank drops..
>
> Fergus
>
>