How do I bleed the fuel - Nanni 4 390 TDI in a Merry Fisher 805?

[chuzzlewit]

Before changing the final diesel filter, I'd like to be confident I can do this. The book says "Open the air vent screw on the top of the filter carrier. Use the included lift pump. Close the screw when bubbles have disappeared."
I can find no trace of an air vent screw.
The book goes on to describe bleeding by loosening the pressure line union nuts at the injectors if there is no fuel at all.
Any advice gratefully received.

 

[Spi D]

The manual points you to the upper part of the fuel filter on the engine (part 29 in manual photo). In reality you can bleed the filter by loosening the hose connector on the outgoing line (to let air out after filling the filter with fuel).

If still no fuel at injectors the manual tell you to loosen the line at injector no 1 to bleed any air out. If not sufficient I'd bleed the others as well, trying to start after each.

If it starts before bleeding all but runs badly (=not on all cylinders), a swift bleed of lines at injectors might let out the 'blocking' air.

 

[chuzzlewit]

Thanks: I'll give it a try.

 

[kashurst]

if you can put a length of rubber tube on the bleed nipple and run it down into a container before you start. Only open the bleed nipple 1/4 - 1/2 a turn. If you haven't done it before make sure you have lots of rag/paper towel. It is very easy once you have tried it. The pros do it in a few pumps with little spillage. First time I did it I got diesel everywhere.

 

[Firefly625]

Slight thread drift, but installed fuel priming bulb to my engine over the wintertime (as well as new racor filter) , works brilliantly. Simple and effective, and recommended by Latestarter1.

 

[omega2]

crack the injector pipes starting with the furthest one from the pump, use the lift pump to expel air, when the fuel runs solid close the pipe joint and try a start up it should fire up, if it runs lumpy then crack the pipes joint at each injector in turn, whilst still running, be careful you don't get fuel in your eyes it stings a bit.

 

[burgundyben]

crack the injector pipes starting with the furthest one from the pump, use the lift pump to expel air, when the fuel runs solid close the pipe joint and try a start up it should fire up, if it runs lumpy then crack the pipes joint at each injector in turn, whilst still running, be careful you don't get fuel in your eyes it stings a bit.

You want to think about that again?

 

[Firefly625]

You want to think about that again?

Swap running with cranking

 

[burgundyben]

Swap running with cranking

Not what I was referring too, oh god, ****, I'm a bottle of red in La Dolce Vita down, but, Omega2 inferred that you need to start bleeding with the injector furthest form the pump, when in fact, all injector pipes are the same length, it needs to be like that for timing, suspect Omega2 was thinking of car brake pipes where common practice (As you know James) is to do the longestmostist pipe first.

 

[omega2]

Not what I was referring too, oh god, ****, I'm a bottle of red in La Dolce Vita down, but, Omega2 inferred that you need to start bleeding with the injector furthest form the pump, when in fact, all injector pipes are the same length, it needs to be like that for timing, suspect Omega2 was thinking of car brake pipes where common practice (As you know James) is to do the longestmostist pipe first.

TALKING ABOUT OLD FASHIONED fORDS, do as the majority says if it don't work then try my method.

 

[omega2]

You want to think about that again?

you are talking rotary pumps?? I am talking in line pumps, and what pump is fitted to to these new fangled engines I have no idea.

 

[macboatmaster]

I have the Nanni 4.390
On the fuel filter fit the lower screw in - on o-ring bleed fitting with the wiring - do not connect the wiring
Fill the fuel filter with diesel
it will take quite a bit more than it seems at first of course as the paper element absorbs the fuel
when fill or very nearly, as you have to tip it slightly to fit it between the carrier and the engine bed - at least you do on mine
after oiling o-ring on top of filter screw on.
connect wiring for water in fuel warning on your dash panel

open fuel tap on tank and if you have tap fitted before Racor - which I presume you have - Racor I mean - open that tap as well
Pump until hard the pump on the replaced fuel filter it is the small fitting on the top of the filter carrier.

Start engine, you should not have a problem

If you have paid the normal price for this filter from the Nanni dealer - at £42 or about that I think - there is no need to - it is a Toyota 1KZ base as fitted to some Land Cruisers 2982 cc

Price at most car spares and it is nothing special on the Nanni - but do not buy some unknown make is approx. £10 - £12

DO NOT crack injectors unless you have attempted to start engine with NO fuel in that filter

 

[Latestarter1]

you are talking rotary pumps?? I am talking in line pumps, and what pump is fitted to to these new fangled engines I have no idea.

Lay off you are both in violent agreement!

Since the beginning of time, well not quite the advent of the Bosch inline fuel pump in the 1920's and since arrival of rotary pumps in the late 50's good practice has always been that injector pipes are of the same length in order that injectors will all see identical line pressure.

Who suggested that Ford always engaged in good engineering practice?

 

[burgundyben]

that injector pipes are of the same length in order that injectors will all see identical line pressure.

Ah, of course, its not timing, its pressure drop, Bernoulli equation.

 

[chuzzlewit]

I have the Nanni 4.390
On the fuel filter fit the lower screw in - on o-ring bleed fitting with the wiring - do not connect the wiring
Fill the fuel filter with diesel
it will take quite a bit more than it seems at first of course as the paper element absorbs the fuel
when fill or very nearly, as you have to tip it slightly to fit it between the carrier and the engine bed - at least you do on mine
after oiling o-ring on top of filter screw on.
connect wiring for water in fuel warning on your dash panel

open fuel tap on tank and if you have tap fitted before Racor - which I presume you have - Racor I mean - open that tap as well
Pump until hard the pump on the replaced fuel filter it is the small fitting on the top of the filter carrier.

Start engine, you should not have a problem

If you have paid the normal price for this filter from the Nanni dealer - at £42 or about that I think - there is no need to - it is a Toyota 1KZ base as fitted to some Land Cruisers 2982 cc

Price at most car spares and it is nothing special on the Nanni - but do not buy some unknown make is approx. £10 - £12

DO NOT crack injectors unless you have attempted to start engine with NO fuel in that filter

Thanks : that's really helpful. I can see no sign of a bleed screw or bleed nipple.

 

[omega2]

Lay off you are both in violent agreement!

Since the beginning of time, well not quite the advent of the Bosch inline fuel pump in the 1920's and since arrival of rotary pumps in the late 50's good practice has always been that injector pipes are of the same length in order that injectors will all see identical line pressure.

Who suggested that Ford always engaged in good engineering practice?

No one they just keep banging on!! LOL AND CAN BE OPERATED BY ORANGUTANS

 

[chuzzlewit]

I have the Nanni 4.390
On the fuel filter fit the lower screw in - on o-ring bleed fitting with the wiring - do not connect the wiring
Fill the fuel filter with diesel
it will take quite a bit more than it seems at first of course as the paper element absorbs the fuel
when fill or very nearly, as you have to tip it slightly to fit it between the carrier and the engine bed - at least you do on mine
after oiling o-ring on top of filter screw on.
connect wiring for water in fuel warning on your dash panel

open fuel tap on tank and if you have tap fitted before Racor - which I presume you have - Racor I mean - open that tap as well
Pump until hard the pump on the replaced fuel filter it is the small fitting on the top of the filter carrier.

Start engine, you should not have a problem

If you have paid the normal price for this filter from the Nanni dealer - at £42 or about that I think - there is no need to - it is a Toyota 1KZ base as fitted to some Land Cruisers 2982 cc

Price at most car spares and it is nothing special on the Nanni - but do not buy some unknown make is approx. £10 - £12

DO NOT crack injectors unless you have attempted to start engine with NO fuel in that filter

Happy ending. It all went as Macboatmaster predicted.