What does it do????

Technical questions and answers about the Mazda Bongo

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Barrington
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What does it do????

Post by Barrington » Sun Nov 21, 2010 8:07 pm

Hi guys im just sat here pondering the ins & outs of the fuel system!!! guys can you please explain to me the purpose of the banjo filter!! how does it work i mean is it a 1st of last stage filter? what exactly is its purpose? many thanks Barrington,
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dave_aber
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Re: What does it do????

Post by dave_aber » Sun Nov 21, 2010 8:10 pm

It is a bit bizarre really, it's a coarse filter located downstream of a fine filter - and it's not uncommon to find crap in them. How did it get there?
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Re: What does it do????

Post by Barrington » Sun Nov 21, 2010 8:15 pm

Checked mine it was clean, so Dave how many other filters are in the system, apart from the big main filter?
dave_aber wrote:It is a bit bizarre really, it's a coarse filter located downstream of a fine filter - and it's not uncommon to find crap in them. How did it get there?
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Re: What does it do????

Post by fatcatlawyer » Sun Nov 21, 2010 8:37 pm

I like to think of it as "the filter of last resort". If any bits manage to get through the main filter or break off the fuel pump that is the barrier to stop them entering the fuel supply system and doing serious damage to the engine.

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Re: What does it do????

Post by mister munkey » Sun Nov 21, 2010 8:43 pm

Keeps other irritants clear of the fuel system too.

I've never heard one of these to cause a blockage yet.




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Re: What does it do????

Post by You've Been Bongod » Sun Nov 21, 2010 11:08 pm

Barrington wrote:Hi guys im just sat here pondering the ins & outs of the fuel system!!! guys can you please explain to me the purpose of the banjo filter!! how does it work i mean is it a 1st of last stage filter? what exactly is its purpose? many thanks Barrington,

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Re: What does it do????

Post by skater » Mon Nov 22, 2010 12:46 pm

My local diesel specialist said I should throw it away.

I didn't because that would have involved effort.

There is an opinion that the process of removing it, to clean it, could knock dirt into the chamber you removed it from. #-o

I've checked mine twice in the last +/-4yrs. It was fine both times.
Probably won't check again.

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Re: What does it do????

Post by teenmal » Mon Nov 22, 2010 1:04 pm

Barrington wrote:Checked mine it was clean, so Dave how many other filters are in the system, apart from the big main filter?
dave_aber wrote:It is a bit bizarre really, it's a coarse filter located downstream of a fine filter - and it's not uncommon to find crap in them. How did it get there?

Hi Barrington,

There are 3 filters...one in the tank,the main throw away filter and what you call the banjo filter.

Cheers..
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Re: What does it do????

Post by francophile1947 » Mon Nov 22, 2010 1:09 pm

When my banjo filter blocked, there were signs of fibres from the main filter element :? and something gritty #-o Anyway, it has saved mine from whatever is was getting through to the injectors/cylinders, so it stays 8) :lol: :lol:
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Re: What does it do????

Post by dandywarhol » Mon Nov 22, 2010 1:16 pm

I believe it's there to trap the fine particles that come off a NEW filter during manufacture.
That's why Yamaha say to replace the oil filter only every 2 (6000 mile) oil changes :)
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Re: What does it do????

Post by Barrington » Mon Nov 22, 2010 2:42 pm

Many thanks guys that explains all cheers Barrington, :D :D :D :D =D> =D> =D> =D>
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Re: What does it do????

Post by bigdaddycain » Tue Nov 23, 2010 12:03 am

francophile1947 wrote:When my banjo filter blocked, there were signs of fibres from the main filter element :? and something gritty #-o Anyway, it has saved mine from whatever is was getting through to the injectors/cylinders, so it stays 8) :lol: :lol:
That wouldn't have been a blue fibre would it John? The odd times i've removed the filter for a cursory check, i ONCE found a stray blue fibre in the filter! Funnily enough, not long after replacing the main fuel filter! :-s
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Re: What does it do????

Post by dandywarhol » Tue Nov 23, 2010 12:35 am

oops :oops: must've overlapped your post when posting mine Franco :oops:
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Re: What does it do????

Post by francophile1947 » Tue Nov 23, 2010 4:21 pm

bigdaddycain wrote:
francophile1947 wrote:When my banjo filter blocked, there were signs of fibres from the main filter element :? and something gritty #-o Anyway, it has saved mine from whatever is was getting through to the injectors/cylinders, so it stays 8) :lol: :lol:
That wouldn't have been a blue fibre would it John? The odd times i've removed the filter for a cursory check, i ONCE found a stray blue fibre in the filter! Funnily enough, not long after replacing the main fuel filter! :-s
Can't remember the colour Steve. I was assuming that they were from the newly fitted fuel filter, because the banjo filter actually looked clean, until I wiped it and there was a very, very thin layer of "fluff" (No comments about bits of fluff please [-X :lol: )
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Re: What does it do????

Post by dandywarhol » Tue Nov 23, 2010 7:40 pm

francophile1947 wrote:
bigdaddycain wrote:
francophile1947 wrote:When my banjo filter blocked, there were signs of fibres from the main filter element :? and something gritty #-o Anyway, it has saved mine from whatever is was getting through to the injectors/cylinders, so it stays 8) :lol: :lol:
That wouldn't have been a blue fibre would it John? The odd times i've removed the filter for a cursory check, i ONCE found a stray blue fibre in the filter! Funnily enough, not long after replacing the main fuel filter! :-s
Can't remember the colour Steve. I was assuming that they were from the newly fitted fuel filter, because the banjo filter actually looked clean, until I wiped it and there was a very, very thin layer of "fluff" (No comments about bits of fluff please [-X :lol: )
Exactly - tiny fibres from the new filter - madness to throw away something there for a purpose.............. :?
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