Air sound from pump before start up

Discodevon · Jul 11, 2023

Hi guys my trusty 110 td5 has been making an air in fuel system noise the moment you turn the key on morning starts for a week now, it sounds a bit like after changing the fuel filter noise, but goes away after 1 to 2 seconds so it’s hard to catch the noise it’s that quick, still starts and drives like normal, I’m one to try and catch any problems quick before they become a real problem, I’ve tightened down the fuel filter water tap a touch more but other than that not really looked to far into it.. injector seals time?

sierrafery · Jul 12, 2023

Hi, check the air bleed valve in the rear outer port of the filter head, if it's gunked up might be a sign that the injector copper washers are leaking a bit, eventually replace the valve with a new one(WJN500110) and see what happens

Discodevon · Jul 12, 2023

sierrafery said:
Hi, check the air bleed valve in the rear outer port of the filter head, if it's gunked up might be a sign that the injector copper washers are leaking a bit, eventually replace the valve with a new one(WJN500110) and see what happens

Thanks mate, will get onto that

Discodevon · Jul 12, 2023

sierrafery said:
Hi, check the air bleed valve in the rear outer port of the filter head, if it's gunked up might be a sign that the injector copper washers are leaking a bit, eventually replace the valve with a new one(WJN500110) and see what happens

Hello again, my mechanic said just change the whole filter assembly, it looks like it’s only 2 bolts holding it in so shouldn’t be a massive task for me to replace it? Regards

tom1979 · Jul 12, 2023

You sure it's not just the fuel circulation you can hear? Where can you hear it the most

tom1979 · Jul 12, 2023

Discodevon said:
Thanks mate, will get onto that

I know someone that's got loads of them

Discodevon · Jul 12, 2023

tom1979 said:
You sure it's not just the fuel circulation you can hear? Where can you hear it the most

Hello mate it’s Definitely air in the system I think, it sounds like the fuel filter has been changed kinda sound, think it’s getting worse now ( the sound ) gradually

I ordered a filter housing on eBay yesterday (Again I’m kicking myself I completely forgot about you guys at TW, again! Hope you are doing well buddy

Discodevon · Jul 12, 2023

tom1979 said:
I know someone that's got loads of them

Sorry I forgot to say that it’s mostly around the filter housing/pump I can hear it

tom1979 · Jul 12, 2023

Discodevon said:
Hello mate it’s Definitely air in the system I think, it sounds like the fuel filter has been changed kinda sound, think it’s getting worse now ( the sound ) gradually

I ordered a filter housing on eBay yesterday (Again I’m kicking myself I completely forgot about you guys at TW, again! Hope you are doing well buddy

Can't keep them in stock for more than a day anyway it seems to be the season for it!

Discodevon · Jul 12, 2023

tom1979 said:
Can't keep them in stock for more than a day anyway it seems to be the season for it!

Hopefully it will be that and I don’t end up throwing loads of money on it fingers crossed

tom1979 · Jul 13, 2023

Discodevon · Jul 13, 2023

tom1979 said:
View attachment 292831

What does it sound like to you mate?

tom1979 · Jul 13, 2023

Discodevon said:
What does it sound like to you mate?

Have you tried spraying the area with soapy water? It's difficult to say. Air bleed valve is cheap enough to replace but if you've ordered a housing might as well wait and see if that cures it

Discodevon · Jul 13, 2023

tom1979 said:
Have you tried spraying the area with soapy water? It's difficult to say. Air bleed valve is cheap enough to replace but if you've ordered a housing might as well wait and see if that cures it

No I haven’t tried that tbf, I think my mechanic didn’t realise how much the housing was or something lol, are the fuel pipe clips hard to remove?

tom1979 · Jul 13, 2023

Discodevon said:
No I haven’t tried that tbf, I think my mechanic didn’t realise how much the housing was or something lol, are the fuel pipe clips hard to remove?

They can be a bugger to remove!

Discodevon · Jul 15, 2023

Update: changed the filter housing which took me a whole afternoon to do, snapped bolt and the fuel pipe clips had me there a long time but finally done, a few miles this morning confirmed that it wasn’t anything to do which the filter housing because I still get the air noise, the old housing was in a bit of a mess so kinda glad to change it anyway, what’s next injector seals?

sierrafery · Jul 15, 2023

Check the air bleed valve in the old one and if the small holes are with black residues means that combustion gas got into the fuel near the copper washers

Discodevon · Jul 15, 2023

sierrafery said:
Check the air bleed valve in the old one and if the small holes are with black residues means that combustion gas got into the fuel near the copper washers

Just checked it looks quite dirty in there but no sludge?

sierrafery · Jul 15, 2023

Discodevon said:
Just checked it looks quite dirty in there but no sludge?

It's possible that the leak is just at the beginning hence the engine is still starting and running well

Discodevon · Jul 16, 2023

sierrafery said:
It's possible that the leak is just at the beginning hence the engine is still starting and running well

Do you mean at the injection area? Is it still alright to drive?

Air sound from pump before start up

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