Question about 1997 Mazda MPV

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Car stop running running @ highway speed. Replaced fuel pump. relay good. How do I prime the system and injectors? The two yellow wires jumped did not seam to prime the system.?

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Your fuel injector rails should have a pressure release valve somewhere. Pressure needs to be released. Watch out for flying fuel though!!!

Posted on Feb 03, 2010

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I'd have to test when problem is ongoing. When you first turn on key, no crank, you should hear the pump run for a few seconds then stop. For initial prime, the computer doesn't need rpm signal. Engine cranking, the computer needs to see rpm signal or it won't ground the fuel pump relay. W/o rpm signal, no spark at the plugs and no fuel injector pulse. I know your talking about fuel, but, when problem is ongoing, check spark and fuel injector pulse, engine cranking.
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It sounds like the fuel pump is not working. Perhaps the install was not completed correctly. Things to check, fuel pump relay, wiring, voltage to the pump.
The priming happens as soon as you put the key in and turn it to "acc" (you may hear a humming sound). Then once you turn it to "start" the injectors and spark plugs start firing.
Another possibility is that the fuel filter was installed backwards.

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1 Answer

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Sounds like the problem might be in the relay but before replacing that relay, check all fuses and especially any ecm fuses. Do you have a check engine light come on when you turn the key to the on position?I believe that on this vehicle there is a relay that is labeled "eec relay" this is the relay for the power to the ecm. eec stands for "electronic engine control" If this circuit is dead the fuel pump relay will not come on either, but worse than that the ecm stays dead and the injectors are not delivering the fuel to the engine even when you jump the fuel pump manually.
Check these items and make sure that the computer is getting power and I think you problem will be found.

There is a black wire with a connector like thing in it near the battery cable on the negative post make sure that this connection is good ,it is the ecm ground and the same symptoms will happen if it is not connected well.

Good luck. I hope this helps.

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