lynneric
Parking Attendant
Posts: 6
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posted June 27, 2009 06:51 PM
cam & crank postion sensor
what is the function of a cam & crank postion sensor, and which one control fuel flow, i have a 2003 zx12 from 0 to 7,000 rpm my fuel pressure is 45 psi above 7,000 it drop to 30 psi i havent change the fuel pump yet want to see if the problem might be something else before i spend $500.00 for a fuel pump
  
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Tazio
Parking Attendant
Posts: 18
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posted June 27, 2009 07:54 PM
The cam and crank sensors are for ignition timing and injector phasing and have no control over fuel pressure. At wide open throttle, the engine uses the the highest volume of fuel from maximum torque ( above 7000 ) to maximum horsepower. Any restriction in the fuel supply will cause fuel pressure to drop. This could be a clogged fuel strainer, weak pump or pinched fuel line ( before your fuel pressure gauge ). I would check the strainer first.
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Tazio
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lynneric
Parking Attendant
Posts: 6
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posted June 28, 2009 06:59 PM
i need help
the strainer is clean, the fuel pressure gauge was connected to the fuel pump and to the fuel injector rail their wasnt no kinks or anything in fuel line
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KZScott
Needs a life
high on speed
Posts: 7235
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posted June 29, 2009 12:59 PM
if its the pump, you could probly get a suitable replacement for $100. like a Walbro gss242 ? i think im remembering the right one?
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01 ZX-12R 8.84 @ 156.3 no bars, DOT tires. Pump Gas, NA.... turbo 8.47 @ 164.
00 ZX-12R 8.62 @ 165.2 no bars, slicks, Pump Gas, 55 shot.... turbo 8.32 @173
00 ZX-12R Fastest NA Kawasaki in the world 1: 222.046 1.5: 226.390 Loring AFB
00 ZX-12R street turbo 1: 227.9 1.5: 234.1 Loring AFB
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Loring AFB Worlds fastest ZX-12R
CMG Racing RCC Turbos
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squidbilly
Parking Attendant
super modified
Posts: 17
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posted July 02, 2009 05:29 PM
If the pressure drops under load the pump doesnt have the volume to keep up with demand. The zx12 pumps are weak not just the early ones I have had to factory style pumps in mine now I run an exturnal Walbro with an adjustable regulator very happy with it.
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