Technical Car won't start

[MannedSage1]

My 1.1 cinq won't start. When I turn the key tit doesn't register any fuel but it turns over can anyone help me?

 

[rallycinq]

Add Fuel?

D

 

[MannedSage1]

I've already added fuel and it still didn't do anything

 

[Eklipze3k]

You need 3 things - air, fuel and spark. One or more is missing. If fuel is pumping and you're not in a vacuum, then check the spark.

 

[henseyseries3]

But how much fuel have you added and how is the car parked is it on a slope ect ect?

 

[rallycinq]

Did you run it out and drag up all the crud in the tank?

D

 

[MannedSage1]

Nah I haven't I can't even hear the fuel pump turning on I'm looking for the fuel safety switch and I'm going to reset it and see what happens

 

[MannedSage1]

It's something to do with the fuel pump I don't think power is getting to it

 

[rallycinq]

Put a meter on it. remember the crash switch switches to earth.

D

 

[MannedSage1]

Why do you mean by put a meter on it? And why wouldn't the fuel pump be working when I turn the key it's just not doing anything usually I can hear it when I turn the key and now just nothing

 

[henseyseries3]

Well
1 the fuel safety switch has come on
2 you've got a bad fuse/relay to the fuel pump
3 your fuel pump as died and no longer working

 

[sumplug]

No pump means crank sensor is faulty, or needs cleaning, or a wiring fault. Without a signal, relay won't work, and pump won't.

 

[Eklipze3k]

No pump means crank sensor is faulty, or needs cleaning, or a wiring fault. Without a signal, relay won't work, and pump won't.

If the pump isn't priming when the key is at first position, that's nothing to do with crank sensor.

 

[sumplug]

If the pump isn't priming when the key is at first position, that's nothing to do with crank sensor.

To make the pump run, the pump relay must get a signal from the crank sensor. It prime's the injector(s), ready to fire. You here the relay click. That's the signal from the sensor to say ready.

 

[sumplug]

Have a read of this. It explains things more.
http://www.autotap.com/problem5_engine_cranks.asp

 

[Eklipze3k]

I highly doubt the ignition system in the Cinq is that complex that it wouldn't prime the fuel pump without a signal from the crank sensor.

 

[rallycinq]

This is an SPi cinq, so fairly basic.

Put a meter on the electrical supply to the pump. Cinq pumps are very robust so don't usually fail.

If you have power at the pump, check the return.

D

 

[sumplug]

The crank sensor completes the ignition circuit, that then supplies electricity to the pump relay, that then runs the pump, to prime injector. No crank sensor signal, no ignition, no engine brum brum. Simples.

 

[henseyseries3]

The crank sensor completes the ignition circuit, that then supplies electricity to the pump relay, that then runs the pump, to prime injector. No crank sensor signal, no ignition, no engine brum brum. Simples.

Wrong the pump primes when the ignition is to raise fuel pressure to the rail/injectors and obviously give a solid fuel flow the only time a bad crack sensor will stop any type of fuel is at the injectors obviously if the engine ecu can't see any rpm it's not going to open the injectors or trigger the coil packs

 

[sumplug]

Wrong the pump primes when the ignition is to raise fuel pressure to the rail/injectors and obviously give a solid fuel flow the only time a bad crack sensor will stop any type of fuel is at the injectors obviously if the engine ecu can't see any rpm it's not going to open the injectors or trigger the coil packs

Sorry your wrong.
How does the pump get the power to run the pump? It gets it from the ignition. But to complete the circuit, the ignition circuit must have a crank signal. No crank signal, no relay powered up.
Btw, iam a retired diagnostic engineer.