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Fuel Fuel Delivery


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January 13th, 2018, 01:03 PM   #21
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I Ride: '07Exc 525 & '07 FS 550.Just sold ' 08 Ktm 450 sxf.
My cousin has 2012 fe390. Went through 2 pumps already. And he is sooo careful with his bike. He babies it. Connecror at the pump was also getting loose and losing contact. It's upsetting bike brand reputation. Supposed to be the best of the best....
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January 13th, 2018, 05:23 PM   #22
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I Ride: 10 FX 450,15 KTM EXC 500
I have ordered the ca Cycleworks pump as I retested the Quantum pump.
I stripped out the tank again re positioned and tightened all the hose clamps, Carefully positioned the hoses through the tank. Rechecked all the connections.I could hear the pump cycling with the starter but only if I put my ear up to the rear of the tank.

Still the bike won't start.It was running ok on the origional pump other than the hot fuel problem.

So the Quantum HFP-389 HQ4 ($ 60 US plus $$v 40 US shipping to me)pump as advertised by Quantum fuels USA (as a total match for the Fe/Fx 450) does not seem a trouble free good match for the husy EFI.

I poured fuel down the throttle body and the bike starts, I split the hoses and there is fuel there. The only change I have made is the fuel pump and the bike was running before that.

Jeff Slaven from Slavens Racing recommends the Cycleworks pump I dont think it is worth trying cheaper susbstitutes.

There was a hint on Keyless (starter button only) starting after a pump change,to get the fuel through, it was in the big long fuel pump thread, couldn't find it. Would appreciate if someone who knew would post it again.
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January 14th, 2018, 01:26 AM   #23
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I Ride: 7 Husabergs two FE570S,FS570 FE390/450,07 FE650,05 FE550,2 Husqvarna's 86 WR400,87 510,09 Buell
Have you check all 4 fuel filters plus there is a fuel regulator?
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January 15th, 2018, 12:24 AM   #24
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I Ride: 10 FX 450,15 KTM EXC 500
Hey Rainerio,cheers, I changed out the pump end filter and the inline filter in the fuel line in the tank, I hear there is another small inline filter in the tank end of the clip together hose, not sure how to get to that one.I was going to get a fuel pressure test at the local KTM workshop.Ignorant about the fuel regulator?
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January 15th, 2018, 11:38 AM   #25
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I Ride: 7 Husabergs two FE570S,FS570 FE390/450,07 FE650,05 FE550,2 Husqvarna's 86 WR400,87 510,09 Buell
The one in the fuel line is next to injector. KTM sell one to replace that one and puts it at disconnect easy to check/replace. For regulator I think it’s in the tank. Look at manual to be sure.
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January 15th, 2018, 11:50 PM   #26
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Can anyone point me to a thread on measuring fuel pressure.. have tried a search but cannot seem to see anything.
Im presently on my 2nd Fuel pump (its a cycleworks) but bike isnt starting. new filters.
Gas down the throttle body and it fires.
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January 16th, 2018, 01:25 AM   #27
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I Ride: 10 FX 450,15 KTM EXC 500


Here's a link to checking fuel pressure,fuel pressure from the pump,it can be affected or displaced by changing the diameter/length of the of the fuel hose of poor seals with hose clips, or problems in the regulator. I am trying to get everything set up as good as it was (the old pump was running the bike good so it can't be too much)interested to hear how you get on Kiwiberger as you have the same response from the new pump insert as me. I get a Cycleworks pump on Friday,so will post up any progress or findings
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