THIS is why you add an inline filter
- Medina
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Re: THIS is why you add an inline filter
08 Apr 2012 13:32 - 08 Apr 2012 18:45
It's possible for some form of potentially screen-clogging matter to remain in suspension in the fuel inside the tank.
An example of this is when a fuel tank is painted and excessive over-spray is allowed into the tank interior.
The over-spray becomes small soft globules suspended in the fuel.
With ample fuel in the tank, any suspended globules are further apart and floating in suspension above the petcock's screened intake pipes that are protruding up through the bottom of the tank into the tank interior. When the tank's relatively full of fuel, there's less tendency for the globules to accumulate onto and clog the screened intake pipes.
As the fuel level diminishes, the lesser fuel volume becomes more saturated with the same globules, which increasingly concentrate around and onto the screened intake pipes, and obstructing flow of fuel through the screened intake pipes. Resulting in fuel starvation that's more pronounced with lower fuel levels.
Refilling the fuel tank allows the globules to disburse and float away from the screened intake pipes. Resulting in the return of adequate fuel passage through the screened intake pipes.
Have observed this scenario where a rider in the group had an almost brand new KZ1000 with a beautiful custom paint job, plus a mural painted on top of the fuel tank. Only with a partially filled fuel tank would the bike suffer obvious fuel starvation.
Flushing the tank, and cleaning the petcock's screened intake pipes, completely resolved the problem.
Good Fortune!
An example of this is when a fuel tank is painted and excessive over-spray is allowed into the tank interior.
The over-spray becomes small soft globules suspended in the fuel.
With ample fuel in the tank, any suspended globules are further apart and floating in suspension above the petcock's screened intake pipes that are protruding up through the bottom of the tank into the tank interior. When the tank's relatively full of fuel, there's less tendency for the globules to accumulate onto and clog the screened intake pipes.
As the fuel level diminishes, the lesser fuel volume becomes more saturated with the same globules, which increasingly concentrate around and onto the screened intake pipes, and obstructing flow of fuel through the screened intake pipes. Resulting in fuel starvation that's more pronounced with lower fuel levels.
Refilling the fuel tank allows the globules to disburse and float away from the screened intake pipes. Resulting in the return of adequate fuel passage through the screened intake pipes.
Have observed this scenario where a rider in the group had an almost brand new KZ1000 with a beautiful custom paint job, plus a mural painted on top of the fuel tank. Only with a partially filled fuel tank would the bike suffer obvious fuel starvation.
Flushing the tank, and cleaning the petcock's screened intake pipes, completely resolved the problem.
Good Fortune!
1973 Z1
KZ900 LTD
KZ900 LTD
Last edit: 08 Apr 2012 18:45 by Patton.
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- 1slowkayzee
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- Arthur A
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Re: THIS is why you add an inline filter
08 Apr 2012 19:38
Thank for the pics, 650ed.
Have not found petcock screens.
Have one missing and one damaged.
Where did you get yours ?
Did you adapt them ?
Have not found petcock screens.
Have one missing and one damaged.
Where did you get yours ?
Did you adapt them ?
650ed wrote: I suspect your petcock and mine are different. Mine has 2 screens (one for the "ON" position and one for "Reserve" position inside the tank, plus one in the petcock bowl. All 3 screens inside the tank are pretty fine. I agree that there are decent inline filters that can catch the very fine particles that the petcock screens don't catch, but it seems to me that removing the petcock screens that are inside the fuel tank will allow the larger particles of funky stuff to flow into the petcock and clog it up so it doesn't function as well as it should. When I disassembled my original petcock (manual type) it looked like the tolerances were pretty tight and that it wouldn't take much debris to cause a problem. That stuff shown in you filter picture might have cause a problem for my petcock if it hadn't been caught before leaving the tank. Yours may have a different configuration, because if it had the bowl screen most of that stuff would never have made it to your inline filter. Ed
Tank screen with straight pin head and human hair:
Attachment Filter.JPG not found
Bowl Screen
Attachment FilterBowl.JPG not found
1977 KZ650 C1 stock
original owner
original owner
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Re: THIS is why you add an inline filter
08 Apr 2012 20:37Rendering Error in layout Message/Item: Kunena\Forum\Libraries\BBCode\KunenaBBCodeLibrary::renderEbayLayout(): Argument #1 ($ItemID) must be of type int, string given, called in /home/kzride5/public_html/libraries/kunena/src/BBCode/KunenaBBCode.php on line 314. Please enable debug mode for more information.
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- Medina
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Re: THIS is why you add an inline filter
14 Apr 2012 13:24 - 14 Apr 2012 13:28
Update:
Tank off, shined a bright light in there, I couldn't see any thing outside a few specs of crap floating around.
however: Pulled shook, shake flipped flushed..put back, still no joy.
Pulled petcock (recall the story of modifying it to 'on' or 'off' bypassing vacuum setup) tore it down, ran a 1/4" drill thru all passages (instead of the metric slightly smaller equal) put back, pressure test to 30 psi, no leaks, it goes back on bike-
Pulled line off petcock, 1/4" dia stream of gas, pull line from in front of filter, stream.
pull filter..nothing!
inspect new filter, some tiny specs of something, carb cleaner flows right thru like water..grrr..
Wipe off edge blow gently and air goes right thru (yes, arrow pointing fuel flow has been correct all the time.
) put filter on, trickles..stops..nothing..There is only about a gallon of gas in tank at this time to try and simulate the 100-120 mile fuel starve problem.
Tossed paper filter, put screen filter I had in box that I didn't use when this problem started last year........zing! Flows fine- put 80 miles on with passenger and no problems, will put more on when storm passes.
Lessons for those searching years down the road with same problem
1) ALL paper filters are not created equal
2) All "free flow zero g" free flow paper filters are not "zero g free flow" This one would flow with 4 gallons sitting on top of it, but NOT one gallon!!
3) you look more awesome riding your bike, than sitting on the side of the road pretending to use your cell phone.
petcock screens, inline filter and never remove those inline screens in the intake side of the carb gas rail
Tank off, shined a bright light in there, I couldn't see any thing outside a few specs of crap floating around.
however: Pulled shook, shake flipped flushed..put back, still no joy.
Pulled petcock (recall the story of modifying it to 'on' or 'off' bypassing vacuum setup) tore it down, ran a 1/4" drill thru all passages (instead of the metric slightly smaller equal) put back, pressure test to 30 psi, no leaks, it goes back on bike-
Pulled line off petcock, 1/4" dia stream of gas, pull line from in front of filter, stream.
pull filter..nothing!
inspect new filter, some tiny specs of something, carb cleaner flows right thru like water..grrr..
Wipe off edge blow gently and air goes right thru (yes, arrow pointing fuel flow has been correct all the time.
) put filter on, trickles..stops..nothing..There is only about a gallon of gas in tank at this time to try and simulate the 100-120 mile fuel starve problem.Tossed paper filter, put screen filter I had in box that I didn't use when this problem started last year........zing! Flows fine- put 80 miles on with passenger and no problems, will put more on when storm passes.
Lessons for those searching years down the road with same problem
1) ALL paper filters are not created equal
2) All "free flow zero g" free flow paper filters are not "zero g free flow" This one would flow with 4 gallons sitting on top of it, but NOT one gallon!!
3) you look more awesome riding your bike, than sitting on the side of the road pretending to use your cell phone.
petcock screens, inline filter and never remove those inline screens in the intake side of the carb gas rail
1981 KZ1100 Vetter "Luminous Navy Blue" DAMN YOU COLOR CODES!
Medina, Oh
My Bike Thread
www.kzrider.com/forum/10-new-members/469298-from-ohio
Medina, Oh
My Bike Thread
www.kzrider.com/forum/10-new-members/469298-from-ohio
Last edit: 14 Apr 2012 13:28 by Medina.
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- Patton
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Re: THIS is why you add an inline filter
14 Apr 2012 13:40
These inexpensive and well-performing aftermarket in-line fuel filters are available off-the-wall at most motorcycle dealerships, motorcycle repair shops, and many other small motor repair shops.
www.z1enterprises.com/Fuel-Filter--High-...ne-clear-14-293.aspx
Haven't tried this slimline version:
www.z1enterprises.com/Fuel-Filter--High-...e-clear-14-3289.aspx
Good Fortune!
Attachment filterZ1.jpg not found
www.z1enterprises.com/Fuel-Filter--High-...ne-clear-14-293.aspx
Haven't tried this slimline version:
www.z1enterprises.com/Fuel-Filter--High-...e-clear-14-3289.aspx
Good Fortune!
1973 Z1
KZ900 LTD
KZ900 LTD
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- Patton
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Re: THIS is why you add an inline filter
14 Apr 2012 13:57
Here's an interactive demo of pressure/height relationships.
Watch the outlet pressures change as you move the guy up and down the hill, and as you change the level inside the tank.
mste.illinois.edu/murphy/WaterTower/default.html
Good Fortune!
Watch the outlet pressures change as you move the guy up and down the hill, and as you change the level inside the tank.
mste.illinois.edu/murphy/WaterTower/default.html
Good Fortune!
1973 Z1
KZ900 LTD
KZ900 LTD
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- Patton
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Re: THIS is why you add an inline filter
14 Apr 2012 14:01
1973 Z1
KZ900 LTD
KZ900 LTD
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