Volvo 2030 fuel filter change - bleeding

[Jamie Dundee]

How do you pre-fill CAV 296 filters ?

I don’t have a CAV filter, I have the usual engine spin on filter and a Racor 500 turbine prefilter. I prefill the engine filter then top off the Racor after changing the drop in filter although generally as long as the engine filter is primed the secondary filter unit takes care of itself.

 

[PaulRainbow]

The primer bulb can go anywhere between the tank and the lift pump, wherever is most convenient.

CAV296 owners, why not make your life easier by fitting one of these: CAV HDF296 spin on replacement, takes spin on filters, same thread for fittings | eBay

Using these filters: Delphi Diesel Fuel Filter HDF496

Both as examples, shop around for best deals.

 

[PaulRainbow]

I don’t have a CAV filter, I have the usual engine spin on filter and a Racor 500 turbine prefilter. I prefill the engine filter then top off the Racor after changing the drop in filter although generally as long as the engine filter is primed the secondary filter unit takes care of itself.

But the thread is about changing CAV296 filters.

 

[Jamie Dundee]

But the thread is about changing CAV296 filters.

Or is it just a case of replace both the Cav pre filter and on engine filter, losening the bleed screw and pumping the feed pump, possibly forever?

I read both filters.

 

[PaulRainbow]

I read both filters.

Regardless, "I fill the filters with diesel before fitting, therefore 3/4 strokes on the priming pump removes remaining air from the system and away you go. " does not apply to the OP or anyone else with a CAV 296, does it ?

 

[Jamie Dundee]

Regardless, "I fill the filters with diesel before fitting, therefore 3/4 strokes on the priming pump removes remaining air from the system and away you go. " does not apply to the OP or anyone else with a CAV 296, does it ?

Something wrong with prefilling the main engine filter is there? Bad advice? Not ’best practise’? Not to be entertained at any price?

FFS

 

[PaulRainbow]

Something wrong with prefilling the main engine filter is there? Bad advice? Not ’best practise’? Not to be entertained at any price?

FFS

Depends what the engine filter is, if it's a spin on filter it is, of course good practice. Suggesting the Op pre-fill his filters and he'll be done in 3/4 strokes of the pump is still not applicable to his setup.

Put the spade away now

 

[penberth3]

Something wrong with prefilling the main engine filter is there? Bad advice? Not ’best practise’? Not to be entertained at any price?

FFS

The point is, even if you can hold a 296 together and carefully pre-fill it, the diesel will be on the floor or down your sleeve before you get near the engine.

 

[Kinsale373]

Sorry but none of this makes any sense. There are no rubber fuel lines going to the injectors,

My MD 2040 has a rubber fuel line carrying fuel from the diesel filter on the engine to the Injector block . Its painted green , maybe thats what's confusing you! I just checked in the work shop manual and it shows the same for the 2030. Are you thinking about a different engine Paul?

Kinsale 373

 

[black mercury]

I believe you are confusing the fuel injection pump with the fuel injectors.
The injectors are at the top of the engine with steel fuel pipes attached to them.

 

[PaulRainbow]

My MD 2040 has a rubber fuel line carrying fuel from the diesel filter on the engine to the Injector block . Its painted green , maybe thats what's confusing you! I just checked in the work shop manual and it shows the same for the 2030. Are you thinking about a different engine Paul?

Ah, i get what you mean now. I was confused when you said "rubber fuel hose going to the injectors". I see now what you mean, you are sucking the fuel through both filters and the lift pump. this will of course work, but you could just fit the primer bulb permanently, either side of the primary filter.

 

[Jamie Dundee]

Put the spade away now

Oh dear, into the kill file you go

 

[black mercury]

Oh dear, into the kill file you go

Sounds like a threat ?

 

[PaulRainbow]

Oh dear, into the kill file you go

Ah bless, you swapped the spade for a dummy

 

[Jamie Dundee]

Sounds like a threat ?

Not really, old fashioned term for ignore list.

 

[Never Grumble]

When I undid the engine filter bleed bolt or the feul filter (once i got it loose) loads of fuel came out ~ around half a ltr or more. This is over and above what was in the filter

How do you stop all the fuel coming out when removing the engine filter? It was coming from the threaded part as a good small jet. Is that normal and you

The OP asked about the above, I have only done mine once (only owned the boat yacht for one maintenance cycle) and I experienced the same, is there a way to stop all this fuel draining from the system when you remove the engine filter?

For the OP when I did my RYA diesel course the guy suggested disposable nappies for soaking up the spilt fuel.

 

[duncan99210]

If there isn’t a fuel cut off valve between the filters and the tank and the tank (or fuel level in the tank) is higher than the filters (or the pipe loops higher than the filters) then the fuel will drain out of the filter once you’ve removed it. Either fit a valve ( proper job) or have a larger container ready to catch the fuel (easier job, but not proper).

 

[Easticks28]

If there isn’t a fuel cut off valve between the filters and the tank and the tank (or fuel level in the tank) is higher than the filters (or the pipe loops higher than the filters) then the fuel will drain out of the filter once you’ve removed it. Either fit a valve ( proper job) or have a larger container ready to catch the fuel (easier job, but not proper).

See post #16

 

[Never Grumble]

If there isn’t a fuel cut off valve between the filters and the tank and the tank (or fuel level in the tank) is higher than the filters (or the pipe loops higher than the filters) then the fuel will drain out of the filter once you’ve removed it. Either fit a valve ( proper job) or have a larger container ready to catch the fuel (easier job, but not proper).

There's a valve on the top of my tank which I did shut off, still seemed to be a lot of fuel that came out.

See post #16

is a photo of a filter?

 

[SteveA]

When I undid the engine filter bleed bolt or the feul filter (once i got it loose) loads of fuel came out ~ around half a ltr or more. This is over and above what was in the filter

How do you stop all the fuel coming out when removing the engine filter? It was coming from the threaded part as a good small jet. Is that normal and you

The OP asked about the above, I have only done mine once (only owned the boat yacht for one maintenance cycle) and I experienced the same, is there a way to stop all this fuel draining from the system when you remove the engine filter?

For the OP when I did my RYA diesel course the guy suggested disposable nappies for soaking up the spilt fuel.

Would putting a primer bulb in the rubber return line to tank stop all this mess - shut the tank supply valve off and crack open the bleed on the primary filter. Then pump the primer bulb which would then pump all fuel out of the system. Replace filters, open the tank supply and reprime the whole system with the primer bulb. I've not tried this yet but is there a problem with the theory (would it be able to draw through the hp p/p for example)