[Jnl73]

So I recently purchased a used Z6. Unloaded it from the trailer put it in the storage literally drove 100 feet and it will not start. No power to the fuel pump. The engine turns over but it will not fire. I see that there are a lot of posts on this thread that people are having the same problem but nobody has posted what the exact diagnosis and solution is can somebody please point me in the right direction of what to look at exactly

[doug80638]

Lots of potential causes. 

If there is no voltage to the pump, trace the voltage lead back until you find the source of the break. Relay? Fuse? Ignition switch? Corroded contacts? Safety interlock (Though this would stop engine from turning over in most cases)?

Is the ECU light indicating any failures? Codes?

Does the pump spin when voltage is applied?

[Jnl73]

Yes the pump works with battery direct line but the engine turns over but still won’t fire

[doug80638]

Tough to give advice without a wiring diagram.

If it's anything like the 800, the starter relay, ignition signal, and fuel pump relay will all be on the same fuse, so you could assume the ignition switch and fuse are OK because the starter spins. After the fuse is the fuel pump relay, and then the pump. So check the connectors and the relay between the ignition switch and the pump for voltage.

The multiple relays may be identical so you might  test them by swapping them around.

Perhaps Clark has a wiring diagram for the 600.

Good luck!

[NMKawierider]

Tough to give advice without a wiring diagram.

If it's anything like the 800, the starter relay, ignition signal, and fuel pump relay will all be on the same fuse, so you could assume the ignition switch and fuse are OK because the starter spins. After the fuse is the fuel pump relay, and then the pump. So check the connectors and the relay between the ignition switch and the pump for voltage.

The multiple relays may be identical so you might  test them by swapping them around.

Perhaps Clark has a wiring diagram for the 600.

Good luck!

The service manual does have one...on 11-28. Here you go:

https://documentcloud.adobe.com/link/track?uri=urn%3Aaaid%3Ascds%3AUS%3A3de917b2-7781-4e89-9a7d-4a1f224b78a0

[Jnl73]

This is what I am thinking. We put power to the fuel pump and it works, but the engine still wouldn’t fire. We tried starting it with the ignition  and ran a bypass wire from the battery to the fuel pump itself and it still would not fire and nothing. And using logical reasoning that tells me that there is a sensor somewhere else I said is prohibiting the engine from firing. 

[NMKawierider]

This is what I am thinking. We put power to the fuel pump and it works, but the engine still wouldn’t fire. We tried starting it with the ignition  and ran a bypass wire from the battery to the fuel pump itself and it still would not fire and nothing. And using logical reasoning that tells me that there is a sensor somewhere else I said is prohibiting the engine from firing. 

Have we tested the CPS? They are known to fail quite often. Also, just because you still have the starter circuit doesn't mean that kill switch doesn't have two other burned of corroded connections..ie the fuel and ignition system. They aren't water proof. 

[doug80638]

The ECU would complain about an out-of-spec sensor.

Is the ECU light on? Any codes?

[dragonmac]

force spray fuel into the throttle body or vacuum line ...does it start then / if yes check injector pulse // if it still does not start check coil fire / also coil pulse from ecm