Question about 1990 kawasaki ZXR 750

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I HAVE A KAWASAKI ZXR750H2 AND THE FUEL PUMP WONT PRIME.I HAVE RELACED THE RELAY AND THE OIL PRESURE SWITCH HELP!

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  • a_newcomb Jul 06, 2010

    Its the petrol pump.It will prime if i hard wire it to the battery.But there is no power going to the pump?

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  • 49 Answers

Fuel pump getting power??? jump the pump ??? fuel pressure switch???bad ground??

Posted on Jul 05, 2010

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Fuel pump won't cycle when the key is turned on 93 Chevy astronaut 4.3 eng


For initial prime, you have to check fuel pump relay and wiring circuits. The control/coil side of relay gets voltage from pcm, green wire with white tracer. The ground for control side of relay, should be a chassis ground. Voltage for load side of relay is fuse protected.
This vehicle has an oil pressure switch in fuel pump circuit, just a redundant power supply to the fuel pump. Even w/o the relay the vehicle should start and run, once the oil pressure builds up and that switch closes, the fuel pump will get voltage. There won't be any initial prime w/o the relay.
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The ECM will send a ground to the relay for about 2 seconds to prime the fuel system. When the motor is running the oil pressure switch should energize the fuel pump.
Autozone.com has free wire diagrams in the repair section that may help if you don't already have any.

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Wont start unless manually primed


Turn the ignition key to the ON position without starting the engine

You should hear the fuel pump priming for about a few seconds then shutting itself off.
If not hear replace the engine oil pressure switch
The 3rd wire to that switch is the pumps prime switch lead.
When the engines oil pressure is reached the computer will shut that circuit off and turn on the fuel pump relay
If you hear the pump prime the relay maybe at fault instead

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My 1996 camaro rs wont start it ran fine the night before it kicks over starts really weak for a half second then dies


Replace the fuel pump relay
This will work for you
The fuel pumps prime comes from the third wire off the Oil Presure Switch
When oil pressure is achieved the computer shuts off that circuit and turns on the relay for the pump.It takes only a few seconds for the oil pressure to be achieved so that is why your engine dies out almost instantly

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jump the pump run a hotlead to pump

Jul 05, 2010 | 1990 kawasaki ZXR 750

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Car turns on for 5 to 8 seconds and turns off will not stay on?


You will need a new fuel pump relay to keep the engine running. The prime switch for the fuel pump operates fine for it starts the engine and once the oil pressure is up to snuff the computer shuts the prime switch off and turns on the fuel pump relay till you shut the engine off

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Car starts and cuts out after 2 to 3 seconds. fuel


When the ignition switch is turned on the pcm turns on the fuel pump by energizing the fuel pump relay. The PCM keeps the fuel pump on as long as the engine is cranking over or running.It does this by recieving pulses from the ignition module. If there are no referance pulses the PCM will turn the fuel pump relay off in 2 seconds with the ingnition on.

Most models also include a secondary control path through the oil presure switch witch will turn the fuel pump on after it detects oil presure.cranking time will be longer if the fuel pump doesn't recieve current until oil presure switch contact is closed.

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Replaced fuel pump twice but have no power to pump.


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Jul 09, 2009 | 1995 Buick Century

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Check for a burned fusible link under the hood. If you have power at the fuel pump relay, you could have a bad ignition switch or bad oil pressure switch...accordianman

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1 Answer

1996 tahoe wont start


There should be a 2 second prime by the fuel pump. This prime by the fuel pump is standard for GM vehicles, and if it is not present a hard start is encountered. Turn the ignition to the run position and listen for the fuel pump operation. You may have to have an assistant listen at the fuel filler by installing a long slender funnel into the fuel inlet to the tank, remove the gas cap and insert the funnel, listen at the large end of the funnel to see if the pump can be heard running. Using the funnel acts like a megaphone and makes it easier to hear the pump. If the pump runs for 2 seconds after you turn the key to the run position (DO NOT attempt to start the engine during this test) and the engine doesn't start due to lack of fuel, check for an obstructed fuel filter. (Just change it, it's probably overdue for service anyway since everyone thinks it get changed during oil changes, but never really does.) If the pump doesn't run during prime interval, the computer may not be turning on the fuel pump relay, or the relay is defective. To check the relay, use another of the relays in the power distribution box to substitute for the suspect fuel pump relay and retest. Be sure to wait at least 30 seconds between key cycles since some systems have a delay timer built in to keep the pump from over running. Be sure the relay you sub into the fuel pump socket is identical to the one you remove and properly oriented in the socket. The engine will run following your manual prime because an additional set of contacts in the oil pressure switch will power up the fuel pump relay once proper oil pressure is achieved by an idling engine. If you find that the relay is not defective, but doesn't provide a priming impulse, the engine computer may have failed. DO NOT use a conventional test light with a filament type bulb to check any of the computer circuits that drive the fuel pump relay, or any other computer controlled circuits on an automobile ( or pickup) The driver circuits in a vehicle computer can be blow-out by over-current when using a conventional test light. You can use a high-impedance DVOM for testing safely.

Nov 01, 2008 | Chevrolet Tahoe Cars & Trucks

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