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To answer the question you asked simply: the Crosland filter doesn't look too bad, but it does appear to have a greenish tinge to the vanes. Gives the impression of beginning to accumulate debris.

Ok, recap: Yes, Atkinson filter at the tank and Crossland filter in line near the boiler. It is the time line that is important. The last thing I did (before today) was take a look at the Crossland filter and found it be completely clogged. That was a few days ago. Last Friday the chap came...

I will get on that, thanks very much. It has already killed one pump, which was swapped out after Christmas, so I would rather not lose another.

Thing is, it was tested for water in the storage tank a few weeks ago, and the guy said there was no water in there. But yes, if it is anything organic like diesel bug it would need water. Whether condensation in the feed pipe is enough to cause that amount of organic contamination I do not...

Well ,in the end it didn't. I'm glad the burner cut out and refused to start again. Well, it did for a minute or so once, and when I sniffed the exhaust plume it was acrid. Unburned fuel, blocked nozzle, repeating problem, got to be algae. I doubt I am lucky enough for it to just be in the...

This is for information, in case anyone ever gets the same thing happen to them. I took off the new nozzle, and took out the strainer from the new pump, and this is what they looked like: That looks like algae to my untrained eye. It was so impacted on the pump strainer I had to shift...

Anyone have a view on different types of filter? Since I am going to have to see this through I may as well be as thorough as I can and think about alternative filters as well as stuff like tiger loops. Question with regard to tiger loops: they are quite big, so can they be fixed higher up on...

Ok, thanks. It ran fine for seven years that I know and probably longer without leaking at all, so I hope the gravity flow is ok. I'd also hope one of the engineers who came out would have picked up on poor gravity flow. Then again if there is some junk in the pipe that would hold the flow up...

Here's a thought: what if I remove the filter bowl at the tank outlet and fill it with an additive that breaks up deposits? Anyone done that to flush the pipeline?

Actually there is a lot of useful information there, so thanks again. It is buried copper pipe, and I had no idea it would undulate, but makes sense. Great idea to blow through the pipe with a foot pump. I may be able to rig that up. I'm hoping the filter near the boiler would catch any...

There's too much info for anyone new to the thread to wade through. The filter near the boiler is bowl filter with two bleed screws. I will be looking at that in the morning. The filter was swapped a couple of days ago but I left a drip tray underneath the filter and some kerosene has leaked out...

I have to assume he did that, but if air is being sucked in at that point it will need doing again. I must confess that those around me have been urging me, out of exasperation I do believe, to 'get a new boiler', but if anything the events to date have shown it is the boiler that is working...

That's great, thank you John, I will do exactly that. I suppose I should also bleed at the filter housing. If the air is collecting there it would stop the flow of oil and cause lockout. I have to assume that is possible otherwise why put the bleed screws on the filter housing?

Yes, for years. However, the flue gasses never smelled particularly clean. I heard that boilers were often 'smelly' and thought no more about it. More is the pity. I should know if there is air ingress if I bleed the system at the burner port. Any air that has entered will escape at that...

Well, I am speculating that the rubber seal/ 0 ring in the filter bowl is not perfectly situated, and that suction from the pump is creating the gap. Then again, maybe not. I will know when I check for air.

I already know the filter at the tank is ok because I checked. The only other filter is near the boiler, the one that was changed.

Thanks. I guess if it is the filter again then that is good news - it will mean there is crap in the supply line still coming through. A limited number of filter swaps ought to take care of that. I suppose one other possibility would be that some particulate element has been crystallising out...

Here's another potentially relevant bit of new information: Since the burner cut out no new kerosene seems to have leaked out at the isolation valve or filter housing. So is this a reasonable conjecture: when the pump works to draw oil through it draws air in and forces kerosene out where a...

I'm not sure whether to be angry, relieved or amused. At this point I reckon I am halfway to being able to maintain the system on my own, so the fact that it has cut out again affords me an opportunity to solve the problem on my own. I am not getting any of the previous people back again, not...

It is tempting to blame the chap who came out, but he was working outside in freezing conditions on Friday. He may have pinched the rubber seal when tightening up after refitting the bowl. I certainly hope so. I guess a tiger loop would solve any problems of air getting in, but I would rather...