Question about 1984 Porsche 928

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Fuel pump wont kick in when i turn the key to start, has new fuel pump, new fuel sender unit new relay, what could be the problem?

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This may or may not help, Tim. I would try disconnecting the battery, just make sure if your radio is equipped with an anti-theft you have the code and know how to unlock it.

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Posted on Mar 13, 2011

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Do you have a check engine light, what is the code. Do You have fuel pressure. You changed the fuel pump but is your fuse and relay good to the fuel pump. When you turn the key on do you hear the fuel pump kick on. It should come on as soon as you turn the key on, not just when you try to crank it. If you have a code it would help.

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You should be able to hear te pump(in the tank) run for 2 seconds when you turn the key to "run".Ifnot,locate the plug at the sender unit for the fuel tank(not sure if you will need to lower the tank to do this).You should get 12v on the(possibly purple) wire when you turn the key to run.If you do,then the pump is most likely the trouble.(Try swapping the fuel pump relay with one of the others-like the A/C compressor relay,before you do all of this-highly unlikely a bad relay,but not impossible).

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You should never try a pump without it being in fuel. It uses fuel for lubrication when it is running. If the vehicle doesn't start at all when you first crank it over it is not the oil pressure sender. If you just put the pump in you might want to turn the key off and on several times to cycle the pump then try to start it. If it doesn't start then check fuel filter or check fuel pressure at fuel rail in engine compartment. Is fuel pump cycling at all when the key is turned on? There is a problem with ignition switches on some of these blazers.

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Well there are a few conditions that can cause this. Number one would be a bad fuel pump. There is also a sensor that cuts power to the fuel pump in case of an accident, I have had one of these go bad drove me crazy. There is also the security system and a fuel pump relay. I would have to say it is probably your fuel pump, also there is a float that controls your gauge in your fuel tank, when these floats stick they will give a wrong reading to your fuel gauge.

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Check the fuel pressure at the fuel rail if 30 psi is not present it may be a bad fuel pump or fuel pressure regulator.

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definitely could be something smaller. Like a relay....even a filter.
Few things to try:
Just turn the key to on, not start and see if you listening to the fuel tank if you can hear the pump going. If not, its either the pump or the relay.
Most of these trucks have another switch that kicks in after the enigine is started and runs the pump so you may be able to spray starting fluid in it while cranking it and get it to start. Then the other switch may kick in and run it. that will let you know if its the relay or what. Let me know what you find. I just replaced a relay on a 93 and it was only $8.....worth a try. Also, there will be a fuel pump fuse, probably close to the relay, could be that!

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Check to see if the fuel pump is kicking in,
when you turn the key on without starting the van you should hear it kick on for about 2 seconds,

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