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PostPosted: Mon Apr 13, 2015 8:38 pm 
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Joined: Thu Mar 13, 2014 7:28 pm
Posts: 4
Drives: Nothing :(
Hi there, got a Cinquecento sporting that won't start. When I last had the car it ran and spluttered out of fuel. I bought it back with the symptoms described as "Would run then just cut out. Switch off and back on would work". I got it running the other day for about 2 minutes (I suspect it ran on the fuel in the lines)

My findings are this so far:

-Fuel pump primed when it fired, I can't hear it prime any more though?
-It restarted a few times running very rough before cutting out seconds later
-It now won't start at all, just turns over lifeless


My current suspects are the following:

Fuel pump (could it be temperamental and playing up?)
Fuel pump relay (old and worn and playing up?)
Crank sensor (again old and playing up, ECU can't tell engines turning, hence no fire)

I feel like the fact it's not priming every time is something to do with it. I feel like it should each time the key is turnt to on? The crank sensor is a bit of a clutch suggestion.

What's peoples thoughts?


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PostPosted: Wed Apr 15, 2015 9:01 pm 
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Joined: Fri Oct 26, 2007 7:27 pm
Posts: 613
Location: Bedfordshire
Drives: Mini
The fuel pump should prime every time the ignition is switched on.

I would suggest grabbing a multimeter and seeing if you have power to the fuel pump when you turn on the ignition and work back from there.

also would it not be worth checking your fuel filter? if there was only a small amount of fuel in the tank it could have pulled an muck through and blocked the filter or the injector.

I'm not the best of mechanical minds, but i'm sure someone else who is will be along shortly to correct me :P

Hope this helps.

Rob

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PostPosted: Fri Apr 17, 2015 10:49 am 
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Joined: Thu Mar 22, 2007 9:20 pm
Posts: 10660
Location: Teesside
Drives: Panda 100hp
As above, check there is power to the fuel pump. Also check the connections to the fuel pump aren't corroded.

The crank sensor won't stop the fuel pump priming, but can cause running/starting issues.

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Pete, technical bod.

.....make it idiot proof and someone will build a better idiot.


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PostPosted: Thu Apr 23, 2015 5:31 am 
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Joined: Fri Jun 26, 2009 1:59 am
Posts: 757
Location: Roundabout City (Milton Keynes)
Drives: Seicento Sporting
yeah pump should run every time the key is turned, for about 2 seconds.

Both of mine had/have issues when run out of fuel. I normally have to put 2 cans in, and then remove the fuel line to the throttle body and then prime it till fuel is flowing well. I prime it into a 500ml pop bottle so it is not wasted.

After that it starts and runs well, prior to that it can idle for some seconds but dies with any throttle. I see it as kind of bleeding the fuel line so that the "push" of the pump is not being dissipated by an air pocket.

So, check for pump prime, and then check this also gives good flow at the throttle body (I reckon this also checks the filter as good flow means non-blocked filter).

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