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Inline fuel filter removal ?

P

PhaZer_SWE1234

Joined Mar 2011
23 Posts | 0+
Hi all.
After 3 hours riding in muddy conditions my 2012 FE570 started to run poorly. After some more minutes it died and wouldnt start again. Several hours later it started but only runs on idle speed so it seems that it dont get enough fuel. Since the fuel pump is running I would beleive it is the fuel-filter that has "clogged"...
As I understand there is an extra fuel-filter outside the tank in the fuel-line which is famous to swell when hot.
My question to the experts is if it is recommended to remove this filter and only use the filter at the pump ?
(this is recommended from the service shop).

Regards P
 
I'm not aware of an OE filter in the fuel line which swells when hot. The has been a problem with the fuel pump causing problems on earlier bikes when it gets hot. There's an inline filter inside the tank, downstream of the pump in the outlet (pressurised) hose.
 
The service shop claims that there is a fuel filter "outside of the tank" and that this filter-issue has a new service remark from KTM (filter swells when warm)...
 
I have read some other threads about the in-line filter causing grief. I installed one on my 2010 FE450 and on the second day of riding my bike started running really lean. I don't know if it was the filter causing the problem or not since I changed the pump and injector at the same time I replaced the filter.

I now have my second in-line filter installed. I have about 4 hard days of riding so far without problem. If my bike starts acting up again, the filter will be the first thing to go.

The in-line filter is really small and sits inside the fuel rail where the fuel hose connects. When I took off the hose I found the filter inside the hose rather than inside the rail. I think it just pulled out while I pulled off the hose.

I do not know which bikes came stock with the in-line filter. Perhaps the 2011 models? Mine did not, and the filter didn't become available until summer 2011.
 
Maybe I'm missing something here but WHY WHY WHY do you need ANOTHER filter in the external fuel pipe? There is a gauze filter on the pump itself and an inline paper element filter on the outlet hose inside the tank. There's no way c**p can get past this inline filter if it is intact.The only place c**p can get to the injector is from the quick release hose connector and whenever I disconect mine (which is rarely) I observe 100% cleanliness.
I also run a filter sock on the tank neck, not because the OE filters are no good but IMO it's better to have no c**p in the tank in the first place, if only because it will increase OE filter life.
 
pegscraper said:
Maybe I'm missing something here but WHY WHY WHY do you need ANOTHER filter in the external fuel pipe? There is a gauze filter on the pump itself and an inline paper element filter on the outlet hose inside the tank. There's no way c**p can get past this inline filter if it is intact.The only place c**p can get to the injector is from the quick release hose connector and whenever I disconect mine (which is rarely) I observe 100% cleanliness.
I also run a filter sock on the tank neck, not because the OE filters are no good but IMO it's better to have no c**p in the tank in the first place, if only because it will increase OE filter life.
Click to expand...

The tank sock helps keep your tank clean.

The pump filter is a coarse filter to protect the pump.

The in-tank filter is a fine filter to protect the injector. You can't use a fine filter prior to the pump because you need the pump pressure to force the fuel through the filter.

Two possible reasons for another filter in the fuel line; 1) some believe the in-tank filter isn't fine enough to protect the injector. From what I have read, the filter needs to be 10 micron or smaller. I don't know the spec on the Husaberg/KTM filter. 2) To protect from dirt entering at the quick disconnect. Some people replace the QD with the CanAm filter. When they remove the take, they disconnect the tank end and not the injector end.

The KTM in-line filter serves the same purpose as the CanAm filter (or equiv) but it sits inside the fuel rail. But there seems to be some evidence that it expands when hot and reduces fuel flow to the injector.

So perhaps the extra filter is overkill. It may depend on your personal situation. I can see desert racers wanting that extra layer of protection, but maybe for others it isn't needed.
 
Thx for all inputs in the matter. I will remove the filter and go only with "tank-filter" as suggested by the dealer.
 
I know I'm missing something. There's no "sock" in the filler neck of my FE570S, and in fact I don't know of a fuel filter on my machine.
 
Ruger said:
I know I'm missing something. There's no "sock" in the filler neck of my FE570S, and in fact I don't know of a fuel filter on my machine.
Click to expand...

Sock filter for the tank is an aftermarket piece & you have a fuel filter in the tank OEM.
 
I don't believe there is any problem with the OE inline filter in the tank. When I had the ongoing fuel pump problem it was definately the pump itself which failed when hot. I proved this by taking the pump assy out of the tank and trying it in a pan of white spirit. I used white spirit for safety. The pump was fine when cool but if you warmed the pan over a stove the pump would gradually slow as the fuel temp increased until it eventually stalled and would not restart. This was with no filter attatched. Flow through the filter proved to be unaffected by temp.
Incidentally I obtained a new filter, EXACTLY the same manufacturer and part No. from a local Ducati dealer. From memory I think it was one of the Monster models that used it. It was 1/2 the KTM price I was quoted.

The tank neck filter sock is a ProFill item. It slows down tank filling but well worth it IMO.
 
I suspect pegscaper is right. Early on there were lots of unexplained issues with these bikes. Adding an extra filter seemed like a good idea to some, and it seemed to work for them. But I think the most common problem was faulty pumps. Other problems (like mine) probably occurred because we keep messing with the system. Best to leave it alone, I think.
 
Dual, Thanks for that link. It's really tempting. My gas cap is really difficult to turn, though, and I wonder if this would make it even harder. It's so hard to turn that I have to use a little silicone grease on the o-ring periodically. If anyone has any first-hand feedback on the Splitstream product, please do post it.
 
Ruger said:
Dual, Thanks for that link. It's really tempting. My gas cap is really difficult to turn, though, and I wonder if this would make it even harder. It's so hard to turn that I have to use a little silicone grease on the o-ring periodically. If anyone has any first-hand feedback on the Splitstream product, please do post it.
Click to expand...

I use the Profill-Australia filter which looks very similar to the Splitstream. It sits low enough in the intake that it does not interfere with the cap. It does slow down the flow of fuel, so you have to fill the tank more slowly.

The tight fitting cap is a common problem. I just grease it periodically. Some people take off the 3 pronged lock. I found the lock disengages easier if I push down on the vent hose rather than the offset release button.
 
Removed the filter and the bike started and now run perfectly.
There was no dirt in the filter - but completely blocked...
The OEM-filter is placed at the end of the fuel hose at the connection of fuel-hose to the fuelrail before the injector.
 
Yep I had the same problem on my 2012. The filter appeared in the -12 models and the shops started to install them in the -11´s. Then they realised the swelling filter problem and my dealer told me to take that filter away.

For anyone with the same problem, the filter is located in the fuel hose where it is connected to the throttle body.
 

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