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Old 10-15-2012, 06:12 AM   #1
guzzimike OP
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Fuel Pump & Filter

Maybe I should have put this with the other, "My fuel pump has crapped out" threads, but figured they were getting a bit top heavy.
On a recent epic trip across Australia (which ended in Shitsville BTW) the bike started having the usual failing fuel pump symptoms, as the day wore on and warmed up the bike would start cutting out, this got worse as the days wore on until the bike became unrideable.
Then I binned it on a crappy bit of track in Far North Queensland, got a ride with the Flying Doctor and the bike was trucked home. This saved me from worrying about it until now.
(It's an ill wind eh?)
I ordered a new pump from these guys
http://www.highflowfuel.com/i-892784...2006-2010.html
It duly arrived and I set to work removing the old one & fitting the new.
A touch of heat from the heat gun is required to remove the convoluted hose from the old pump.
It was then that I had the bright idea to backflush the filter with petrol.
You would not believe the amount of crap that came out of that filter!
It took about 2 litres of petrol poured through it before it ran clean.
Now this is a bike that has done 50,000km on relatively good quality, non ethanol, clean, dry Aussie fuel.
The filter is not available as a separate part (it's a Mahle KL315) but only as part of the pump assembly which goes for between $500 and $800, depending where you buy it.
I am thinking that the fuel pump overheating / dying may be a result of trying to push fuel through this undersized, blocked filter.
Who ever heard of a fuel filter which is expected to last the life of the bike, no matter what sludge is served up to it?
Only bloody BMW.
Right now I am putting the flushed out filter back in, but next on my list of things to spend money on with this crack whore of a bike is an aftermarket, inline, outside the tank filter from a Holden (Chevvy to you Yanks) or somesuch easy to find, cheap source.
I will remove the in-tank filter. This is easy as the existing filter mounts on a spigot which will take the hose from the pump.

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guzzimike screwed with this post 10-15-2012 at 08:39 AM
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Old 10-15-2012, 06:42 AM   #2
ebrabaek
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This is going to be a great writ up...... Thanks Mike....
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Old 10-16-2012, 07:21 AM   #3
JRWooden
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Thanks Mike!
It is good to know that the $70USD or less pump can fix a problem that would cost far more if left to BMW....

So no issues I guess with either mechanical fit or electrical wiring harness?

In one of the other threads ... there was mention that Mahle will not seel the KL315 filter in the aftermarket that it is a captive part to BMW ...what a load of crap.... perhaps we can find a replacement unit of similar dimensions.

Your idea of external mounting is good I think - In one of the other threads which I can not find ATM a guy did that...
He managed to find a rather long slender filter and strapped to the top of one of the frame rails .... seemed to work fine!
You would also get the advantage of another ~1/4 liter of fuel capacity by moving it!

JRWooden screwed with this post 11-13-2012 at 07:07 AM
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Old 10-16-2012, 06:58 PM   #4
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Quote:
Originally Posted by guzzimike View Post
It was then that I had the bright idea to backflush the filter with petrol.
You would not believe the amount of crap that came out of that filter!
It took about 2 litres of petrol poured through it before it ran clean.
What did the pre-pump filter sock look like? I haven't worried about the canister filter because the sock has always been debris free. Now I'm thinking I should have a look anyway.
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Old 10-16-2012, 08:10 PM   #5
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Clean as a whistle


Quote:
Originally Posted by Oso Blanco View Post
What did the pre-pump filter sock look like? I haven't worried about the canister filter because the sock has always been debris free. Now I'm thinking I should have a look anyway.
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Old 10-16-2012, 09:15 PM   #6
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I just pulled my canister filter and like your's, a ton of junk came out when I back flushed it. Too bad its not replaceable
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Old 10-16-2012, 10:15 PM   #7
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Can we buy a Mahle KL315 or equivelant filter anywhere? Any one have a solution that will fit in the stock location?
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Old 10-16-2012, 10:25 PM   #8
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I am fast coming to the conclusion that this filter is the root of the problem.
If you think back a lot of the "Bike is cutting out" posts came from inmates stuck somewhere in the 3rd world.
Think "crappy gas, blocked filter"
I just can't believe that BMW think this is a life of the bike service item. FWIW the local dealer's service manager agrees with me.
Every vehicle I have ever owned scheduled a fuel filter change at about 40,000 km.
As soon as the bike gets back from having the crash damage repaired I will be removing the in tank filter and replacing it with this one mounted externally.


This is a filter for a Peugeot 206/306 and was chosen for the very good reason that I had it in the shed left over from a car I no longer own.
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Old 10-16-2012, 10:28 PM   #9
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Originally Posted by Indy Unlimited View Post
Can we buy a Mahle KL315 or equivelant filter anywhere? Any one have a solution that will fit in the stock location?
Maybe someone can Indy, but I have just wasted about 8hrs of my life trying to do so without success.
The Mahle is only sold to BMW as far as I can see from posts on other forums.
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Old 10-17-2012, 06:47 AM   #10
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Mike, I absolutely agree with your assessment. It is on a list of things...." what on earth were they thinking" Perhaps if we focus on hunting down a solution, we can just shine where BMW did not, and make this work. Don't feel bad though..... We just bought a 11 Mil Jet, and you would not believe the stuff they are trying to pull on the design. One has F8GS written all over it. Simply amazing, when people does not think. Good work.
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Old 10-17-2012, 06:56 AM   #11
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Thanks for all your efforts and research GuzziMike. Look forward to see where you mount and how you route the external filter.
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Old 10-18-2012, 08:33 PM   #12
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My bike has stalling issues in heat, with low miles and good gas. I got video recently of it happening and will link it and for my dealer to see. The filter is not behind a lot of the stalling issues but may be behind some.

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Old 10-19-2012, 01:05 AM   #13
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I wrote an e-mail to Mahle in Germany, will let you know what they tell me...

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Old 10-19-2012, 01:54 AM   #14
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Originally Posted by Steveman View Post
I wrote an e-mail to Mahle in Germany, will let you know what they tell me...

Steve

Good work Steve
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Old 10-19-2012, 06:17 AM   #15
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I wrote an e-mail to Mahle in Germany, will let you know what they tell me...

Steve
They will probably tell you that they cannot sell parts made for an OEM manufacturer, and not even give you any specs.

I had the same problem when I called Rotax to find out the transmission ratios when the bike first came out, like those things would stay a secret....
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