Bleeding fuel system after filter change

Ritchie, it would be interesting to know if, while trying to bleed the 990, whether you cracked an injector pipe after you had got fuel to the injection pump.

Hello,

You should not really need to depend on a Operator's manual or a second tractor after working on the fuel system.

Follow the route of the diesel from the tank into the engine, at each point make sure that fuel without air is present.

Firstly, ensure that there is Diesel in the tank.

If you removed the glass bowl on the lift pump, slacken the bowl and prime until the bowl is full and air free diesel runs from the bowl.

Slacken the bleed screw on top of the filter assembly and again prime the lift pump until air free Diesel runs from the bleed point.

In my experience, that is often all that is necessary, with the engine running i sometimes crack the injector pipes to expell any possible airlocks that could cause problems later, (when halfway down the road or round the field!) By doing this and listening to the note change in the engine is often a good way yo establish that the engine is correctly running on all cylinders.

Regards

Eric

I agree with all that has been written before but would add the following (if you've got a particularly troublesome fuel system).

1. If you've got 2 fuel filters then bleed both of them.
2. Always bleed the line at the injector pump. If you have got 2 bleed screws at the pump then bleed both of them.
3. After this stage all bleeding has to be done by turning over the engine.
4. I have never had to crack more than 2 injector pipes, the least the better. A 4 cylinder will run with 2 pipes cracked (just about !!!). And remember that it is not sufficient just to crack the pipe. It must be loose to let the air out but no need to completely remove it, otherwise it will be more difficult to tighten up when she fires up.
5. Eric's point about the fuel bowl (which is a water trap) if fitted is very important. Air can be sucked in there very easily. Get it clean and fit a new sealing ring if possible.

My 1212's is also upside down. I too wonder why?

DB780
Valid Point , however, I have 5 gravely tractors and all the bowls are down to collect the water and sediment since it is heavier than fuel.
Even my manual shows it down. Wrong side of the tractor for mine however, but still down.
It’s also hard to get all the sediment out because it is trapped in the housing and screen.
Makes a real mess when cleaning it.
Plus I have an air bubble trapped. Ah ha back to my real question. 

What do the DB engineers say about this one?

Cheers Don

DB780:
I think the upside down bowl was just to aggravate the engineers at Jaguar. Every Jag I've worked on has had the bowl hanging down. But being a bigger DB fan than I am a Jag fan I'll assume that the 'correct way' is upside down (or is that right side up?)