Returning from London on the A11 I noticed a distict lack of power as I came past Atleborough. Switching to diesel solved the problem. So it was obviously linked to the veg oil fuel delivery.
On closer examination I found that the lift pump had failed. The injection pump had enough oomph to draw up the diesel but not the thicker veg oil, hence the difference when I changed over.
The easiest way to test the lift pump is to disconnect the outlet pipe from the pump and crank the engine for a few seconds. Put the open end on the fuel pipe into a jar or something. If fuel flows then the pump is fine, if not, then its kaput.
If you can turn the engine so that the pump is 'on the cam' then you can manually pump using the small lever (this is probably better practice but it can take forever to get it in the right position and if the lever that sits on the cam itself is broken you will never manage it).
The first thing to realise is the fact that you have to remove the 4 fuel injection pipes. You will not be able to access the holding bolts unless you do.
Once these are removed, disconnect the inlet and outlet fuel pipes (13mm compression fittings) and undo the two retaining bolts (10mm).
The pump will(should) come away easily. Remember to remove the gasket as well.
The rear of the pump is 'splash' lubricated from the inside so there will be no oil leakage.
The new pump should come with a gasket and 2 new olives and nuts for the compression fittings (check this when ordering/buying). Clean the mating faces so that the gasket sits flat.
Bolt the new unit in place with the gasket.
Slide the nuts and olives onto the pump inlet and outlet and reconnect the fuel pipes.
You then have to reconnect the fuel injection pipes. These are in two pairs and there position is fairly self explanitory as they will only go back one way. I have read on forums where people have changed the pump without removing these. After 30 minutes of trying, swearing and getting very annoyed; I can assure you that it is far easier if they are removed.
You now need to bleed the fuel system. Open the bleed screw on the top of the fuel filter and crank the engine for a second at a time until resistance is felt in the new fuel pump lever.
Once there is resistance manually pump the lever until fuel flows from the bleed screw.
You can now start the engine. Run it for a few minutes to check for leaks and tighten any fittings that do.
There you are; job done. If you remove the injection pieps the whole job should take less than 30 minutes.
