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More help please

Many thanks for you advice - after looking around at other places on the net I am now convinced this Diaphragm is the problem as other symptoms are the same too. 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 > >
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Mark Cable
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If the tank is pressurising the breather is definitely blocked. This will cause a vacuum to form in the tank and stop the fuel flowing. This is a common fault on boat outboard motors when the tank breather is not opened. However, if the tank is pressurising there may be another problem somewhere. First solve the breather problem and then look elsewhere. It may be that the vacuum in the tank is causing a seal to bypass and pressurising the tank. Getting the tank to breathe may solve the entire problem alone. Try it before touching the fuel pump. Cheers, Peter

Reply to
Peter

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