Fuel reverse purge module

[ciedema]

Originally Posted by stickysidedown

FWIW the respected independent BMW mech I used on one of my road bikes said not to even consider reverse flushing the fuel filter when my f800s played up, he said in his experience over any number of bikes with an issue just using a proprietary cleaner through a half dozen or so tanks did the trick, or the problem was something else.

In saying that he did himself out of paying work (but assured himself of my future business) and you know what he was right, the issue wasn't the filter!

Originally Posted by GazzaFish

Can i assume that if my filter blocks up that my bike will run poorly but still manage to get me home? If so, then i'd rather wait till it fails and do it then. It the problem causes me to be stranded with a bike that won;t run AT ALL. Then i'm more interested in preventing it...

The bike can go from running to not in under 600km (~450 miles) in the Australian outback that is not a whole lot of range. When I had it happen it was even less, the bike gave a little splutter and within 100miles I was stuck on the side of the road. I actually pulled the fuel the pump out on the side of the road, rinsed it and blew sound air (from my mouth) back through it and was going again. I was very surprised it fouled that quickly I would have expected at least 20,000 miles out it, but it was filthily. Interesting to hear your Russian experience, I found the fuel there cleanish (especially in the East) but it certainly smelt odd at times.

The guys running them in Aus do so to avoid failure in Middle of nowhere, people don't realise once away from a major centre you are more isolated in Aus than Mongolia. They are developed to avoid failure in really shitty places.

I can see the cost, but you only have to save two changes and you have paid for it. If you need to get them overnighted to somewhere (like I did) the cost equation becomes even less.

All that said I can see why people wouldn't want to pay for one. For me when I hit Africa later in the year, I will be happy to have one fitted.

[skidxr]

Can you remove the filter at the pump and run an inline filter instead?

[azcagiva]

Has anyone tried one of the splitstream fuel tank sock filter that fits in the filler opening. I did not see one for the 9x0 but I imagine they would make one or one could be adapted to work.


-John

[bikyto]

Originally Posted by skidxr

Can you remove the filter at the pump and run an inline filter instead?

There are two filters. The "sock" which you can't remove without possibly compromising the fuel pump. The second is an integral part of the pressure regulator. One could remove that one and put it in line (I've seen it work on several bikes for many thousands of miles). I tried it as well and it worked. I think it affect the fuel pressure at the injectors which are sensitive already. I opted to try something different.

This is the model I have: http://www.cjdesignsllc.com/efi-purge-modules/

Obviously, I would prefer a kit solution for an external fuel pump. Some solutions might come in the future

[knobbyjoe]

I have 15,000 on my KTM 990 Adv and no fuel problems, yet. I am wondering about the fuel filters do to all the posts here about failures. I must conclude that it could happen to me and could leave me somewhere. Still haven't got a handle on what is best. These are the choices

1. Carry a CJ designs fuel pump repair kit. Cost $150 http://www.cjdesignsllc.com/products...d-990-adv-ktm/

2. Put on the purge kit? Cost $270 http://www.dalbymoto.com.au/index.ph...mart&Itemid=27

Or CJ Designs one. Cost $250 http://www.cjdesignsllc.com/efi-purge-modules/

3. Do nothing until a problem occures? Cost $0 but...

4. Figure out the electronics and put in a manual switch to run the fuel pump in reverse. This is my favorite. Problem here is I am too chicken to mess with the pump. Would some knowledgeable person want to see if it is possible on paper? KJ

[FakeName]

Originally Posted by knobbyjoe

4. Figure out the electronics and put in a manual switch to run the fuel pump in reverse. This is my favorite. Problem here is I am too chicken to mess with the pump. Would some knowledgeable person want to see if it is possible on paper? KJ

Oooo.

There's an idea.

Could be as simple as a momentary pushbutton.

[bikyto]

Originally Posted by FakeName

Oooo.

There's an idea.

Could be as simple as a momentary pushbutton.

If I may give my 2 cents.
I still carry an extra set of filters with me on very long trips. You never know, better be safe than sorry.
Since these filters are cost prohibitive, I installed the purge unit from CJ to see if that would pay off over time. It did without a doubt in my case.
Of course, there are thousands of 990s out there and thousands that haven't had an issue. Yet, my first fuel starvation happened at 4000 times on California gas..... so technically "good gas".

Making a unit was my first idea as it is electronically pretty simple. Yet I wanted a fully automated system without additional buttons. All in all, I thought that the price of the unit was relatively cheap considering the parts to purchase and the time I would have to invest in it. But it surely is a fun project.
Don't forget that extra one way valve as not all purge unit system are not created equal. The stock one way valve is ridiculously small.

In the end, the best solution would be an external fuel pump. Just like the 950s.
It's being worked on!

[FakeName]

Tell us a little about the clcye process. Should I stall the bike, do I have to wait for the whole process to happen before I start it again? I already hate to wait for the FI to cycle (I'm old, but immature), and I'd hat to add time to the restart cycle.

[bikyto]

Originally Posted by FakeName

Tell us a little about the clcye process. Should I stall the bike, do I have to wait for the whole process to happen before I start it again? I already hate to wait for the FI to cycle (I'm old, but immature), and I'd hat to add time to the restart cycle.

Ride (or not)....turn the ignition off.....walk away.

on a more serious note: every time you turn the ignition off, within a few seconds, the fuel pump is started in reverse for several seconds then stops.

That's it. Nothing happens when the ignition is switched on again.

[etingelefunts]

Every alternate pump mounted filter is still bound for inevitable clogging. Remember the pump fails due to strain on the pump caused by unabated filter restriction. Purging dislodges/mitigates the restriction every time the ignition switch is killed. Eventually the pump must be unseated and the contaminated fuel discarded, re-seated and ready for trouble free use until the next interval. Your stock pump/system is always happy. With the ongoing purge cycles no pump hernias develop, as long as you purge the buildup as needed.
Every other contingency requires mods, expense, and similar maintenance intervals, while failing to actively mitigate the culprit.
The purge module is the only mod that holds any potential of permanently solving the problem in a way that eliminates the need for further expense.
I had one on my 990 Adventure, and it worked as described, highly recommended.

[FakeName]

Originally Posted by bikyto

Ride (or not)....turn the ignition off.....walk away.

on a more serious note: every time you turn the ignition off, within a few seconds, the fuel pump is started in reverse for several seconds then stops.

I understand how it works- but if the ignition is switched back ON during that process (while reversing), does it automatically cancel itself?

[bikyto]

Originally Posted by etingelefunts

Every alternate pump mounted filter is still bound for inevitable clogging.

Very true. But an external pump along with external filters would be so much easier to deal with when you're stuck in the middle of nowhere (dropping 6+ gallons of fuel into....?? and destroying the o-rings....and then dealing with the warped tank that don't align. I don't want to do it again). I won't even mention the insignificant cost of traditional fuel filters.

Until there is a proven plug and play external fuel pump solution, the purge unit is my answer to the issue.

[bikyto]

Originally Posted by FakeName

I understand how it works- but if the ignition is switched back ON during that process (while reversing), does it automatically cancel itself?

yes, it cancels the process.

[WARDKTM]

I have one done 20000 km no problems filters clean last inspect

[PowerCell]

I like this idea, but it should be $29.95...


.