Question about 2003 ATK 600 Dirt Track Motard

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Fuel filter question

I've been questioning the placement of the fuel filter. In 30 or so years in the automotive industry I have never seen a fuel injection system with the fuel filter on the suction side of the pump. That seems like a real risk for cavitation in the pump. Electric pumps push much more efficiently than they pull. Automotive systems usually have the filter on the pressure side of the pump. Has anyone had success in changing this arraignment? If so

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What filter did you use? I can think of several applications that would fit without changing the volume of the systemSure you could get rid of the carb filter and go to any off the shelf filter rated for high pressure fuel injection. The biggest issue for cavitation is the quick connect fitting. They are just adequate for flow and when the internal orings swell they will shut you down when you least expect it. Drilling the valves out cures that issue . I also recomend using a fram G2 filter in place of the puny stock one. They have 10 times the media. Dont worry about trashing the fuel pump if you get rid of the suction filter as it has a tank screen for catching the rocks. I dont use a pressure side filter due to higher cost and you cannot see the fuel flow and after updating the stock system it works trouble free.,

Posted on Nov 10, 2008

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My kx 2005 was runnin great them started bogging randomly changed reeds top end and cleaned carb...

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I was wondering if there was a fuse for the fuel pump, or if there has to be a certain amount of fuel in the tank for pump to kick on?

most all bikes i"ve worked on have fuse protection. i"ve been on this site for awhile and have seen many questions about fuel pumps, but so far nobody has ever included in their diagnoses that there bike starts and runs fine. but i myself can see why.. because i ran into the same problem with my old just wasnt running fine, seemed like a fuel issue so i turned the key on and tried to listen for a pump sound and found none, so i purchased a new pump, and installed it and turned the key and was so happy to hear the pump sound, fixed right! no, i turned it off and tried it again and then no sound, and in my mind im saying oh no! i just burnt up a new pump, but i said i"ll find out for sure so i took the old pump and reinstalled it (minus all the fuel that was left in it when i dumped it out)... and i turned the key on and voila! i heard the noise and now knew that i wasted $75 bucks! But, oh well, i got a spare now..i talked to another mechanic friend of mine about this problem and he been working on bike for over 40 years and he said you'll know if you have a fuel pump problem if you start to loose power in the upper rpm ranges... it"ll demand more fuel then its when the fuel pressure is correct i'm guessing that the fuel pump doesnt need the prime on all the time. but just to appease myself, i took the fuel pump hose off the fuel filter that was from the pump and ran it to a gas can and i started the bike and saw and felt the fuel squirtting out of the pump...but then i still had to correct the hesitation problem, so i heard about this Sea Foam cleaner stuff that can be purchased from Autozone $10 a can, pour in 1/3 can to 2 gallons was hard to start but would always push start.. so i got it started and ran it for about 11 miles before the stuff had eatin away at whatever was clogging up my carbs and it worked ever since you might want to give this a try.
can you rate my answer, thanks!

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Burning oil.

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99 Harley FLHTCU EFI, engine occasionally dies, on a restart can't hear fuel system pressurize. Cranks over good. Fuel Filter? Fuel Pump? Battery? (battery is 8 yeaars old) Thanks

Sometimes there is adaquate pressure and we don't hear the pump, but it does pump while crank and running. A couple of things here, one is the fuel filter, etc. and battery. You did not say how many miles are on the bie, somethings like the fuel filter are usually replaced based on mileage; while depending whee you are 3 years on a battery is about all you can expect.
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Hope this helps.


Oct 31, 2009 | 2000 Harley Davidson FLHTCUI Electra Glide...

1 Answer


Hi ...... Sounds like debris in the carb bowl, tap the bowl with a wooden hammer shaft and check to see if it's helped. If not switch off petrol at tank and drain carb. Retry switching on. If that fails take bottom of carb off and check float hasn't split .......... never seen one that has in over 30 years.
Let us know how you get on.

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