Discussion
I have suffered a few petrol leaks over the 13 years ownership, from the plenum return to the tank line. It leaks at the junction between the rubber hose from the plenum where it joins the copper tube to the rear by the side of the gearbox. After tightening the fuel clip the problem normally goes away.
This is unexpected as the high pressure line feeding the injectors has never leaked always the low pressure return to the tank. The latest leak was yesterday while starting the car after its winter snooze. It suggests a pressure build-up.
Have decided to fix it properly as several cars seem to have been lost through spontaneous combustion.
Made up a pressure guage and measured the injector feed at 35psi, so fine. The return to the tank feed was about 3-4 psi so also fine. So where is the problem? The return line is free when blown through so not the cause of a pressure buildup perhaps the pressure regulator has an intermittent fault, has any owner experienced this?
While looking at the fuel runs:
Steel feed from the tank,rubber hose to the fuel pump,rubber hose to the filter,rubber hose to the copper pipe, rubber hose to the injectors (8 connections) By having a single Goodridge type Nitrile hose from the filter all the way to the injector rail would reduce this to 6.
On the return feed: Short rubber hose from the pressure regulator to short steel pipe, to rubber hose, to copper pipe by the gearbox, to rubber hose, to tank return. (6 connections) by running a Goodridge hose from the tank straight to the pressure regulator reduces this to 2!
Why is the short steel tube necessary at all? To replace the short rubber hose on the regulator you need to remove the plenum anyway so the longer rubber hose from the copper pipe by the gearbox might as well go straight into the regulator! Is this a hangover from Landrover?
A few weekends ago I replaced the exhaust gaskets, another interesting job! See:
www.bertram-hill.com
This is unexpected as the high pressure line feeding the injectors has never leaked always the low pressure return to the tank. The latest leak was yesterday while starting the car after its winter snooze. It suggests a pressure build-up.
Have decided to fix it properly as several cars seem to have been lost through spontaneous combustion.
Made up a pressure guage and measured the injector feed at 35psi, so fine. The return to the tank feed was about 3-4 psi so also fine. So where is the problem? The return line is free when blown through so not the cause of a pressure buildup perhaps the pressure regulator has an intermittent fault, has any owner experienced this?
While looking at the fuel runs:
Steel feed from the tank,rubber hose to the fuel pump,rubber hose to the filter,rubber hose to the copper pipe, rubber hose to the injectors (8 connections) By having a single Goodridge type Nitrile hose from the filter all the way to the injector rail would reduce this to 6.
On the return feed: Short rubber hose from the pressure regulator to short steel pipe, to rubber hose, to copper pipe by the gearbox, to rubber hose, to tank return. (6 connections) by running a Goodridge hose from the tank straight to the pressure regulator reduces this to 2!
Why is the short steel tube necessary at all? To replace the short rubber hose on the regulator you need to remove the plenum anyway so the longer rubber hose from the copper pipe by the gearbox might as well go straight into the regulator! Is this a hangover from Landrover?
A few weekends ago I replaced the exhaust gaskets, another interesting job! See:
www.bertram-hill.com
Thanks, some useful info there.
The cat equipped Griffith's have a sealed tank that vents to a carbon cannister when the engine is not running. When up to speed a purge valve opens and the petrol fumes from the carbon cannister are pulled into the plenum to be burnt.
I measured the injector fuel pressure at idle and blipping the throttle it stayed around 35 psi and the return feed around 3-4psi. The return line is not blocked so a bit of a mystery as to why the fuel leaked but its always at the same place. The FPR is the standard Rover V8 mechanical device.
I am replacing the complete fuel lines at the weekend so then just a single SS braided hose from the tank to the return union on the FPR and see how it goes. The only places then for a leak are either the FPR connection or a boot full of fuel.
Will report progress.
The cat equipped Griffith's have a sealed tank that vents to a carbon cannister when the engine is not running. When up to speed a purge valve opens and the petrol fumes from the carbon cannister are pulled into the plenum to be burnt.
I measured the injector fuel pressure at idle and blipping the throttle it stayed around 35 psi and the return feed around 3-4psi. The return line is not blocked so a bit of a mystery as to why the fuel leaked but its always at the same place. The FPR is the standard Rover V8 mechanical device.
I am replacing the complete fuel lines at the weekend so then just a single SS braided hose from the tank to the return union on the FPR and see how it goes. The only places then for a leak are either the FPR connection or a boot full of fuel.
Will report progress.
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