Have a 2001 fiat punto..was running then just cut out...got spark no fuel pressure ...have located the fuel pump....4 wires going to pump...on 1 of the wires on ignition its 12 volts but when you crank it ,,it drops down to 9 volts,,this is when it is un plugged..with the wires 2 are thick and 2 are thin ,,the 12 volts is on 1 of the thick wires ..am assuming the thick ones are the pumpo the thin ones are the fuel guage ....any suggestions???????????/

fuel pump
fuel relay
not enough fuel in tank

Technical: HT Leads diagram? - The FIAT Forum

www.fiatforum.com > FIAT Cars > Cinquecento / Seicento
Aug 30, 2008 - 9 posts - ‎3 authors Anyone got a simple diagram of where each lead goes from each plug to which ... Makesure the HT leads are on correct, then try them either way. ... As long as 1+4 spark plugs go to one coil pack, then 2+3 go to the other coil ... Fuel light flashing but won't start (No spark)
15 posts
Nov 2, 2013
Fiat Punto 2001 8 valve 1.2 firing order
3 posts
Feb 8, 2009
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ignition - Methods of diagnosing a non-starting Fiat Uno ...

Sure they replaced the correct coolant sensor (not the one for the dash gauge)? Could be leaky fuel injector(s), bad fuel pressure regulator.

To remove the water pump of Fiat Punto/Stilo:
1 Disconnect the battery negative terminal.
2 Drain the cooling system.
3 Remove the timing belt.
4 Unscrew the retaining nut and the three bolts and withdraw the coolant pump (see illustration). If the pump is stuck, tap it gently? using a soft-faced mallet - do not lever between the pump and cylinder block mating faces of Fiat Punto (Stilo).

Source: Coolant pump removal inspection and refitting FIAT Punto

Hi Gerard, on a 1.28v Punto the plugs are on the back of the cylinder head tucked between the 4 inlet manifolds. The plug closest to the timing belt end (just next to the oil dipstick) is easy to find, the others are a bit obscured by the plastic housing that sheaths the injector wiring. Be careful pulling off the suppressor caps, they hang on quite tight so best use long nose pliers and NOT pull on the HT lead. Hope that helps. Andy

Considering the whole system runs with a common crank sensor, the first place I would test would have also been the coil. If these have been tested and are ok, I would start looking at the ecu. The signal to the coil is generated by the ecu and unless there is a break in wiring, it is more than likely the problem.

If you have access to a wiring diagram, check for the coil trigger signal from the ecu. If this is present at the ecu, problem is wiring. If no signal at ecu then that's your problem.

Keep in mind that cyl 1&4 and 2&3 fire together off common coils in the coil pack so the fact that those cylinders are faulty together, also leads to ecu.

I know the fiat's have a history of problems with ecu- especially if the vehicles are valet'd and the engine pressure cleaned.

Please give us feedback regarding what you find- hope I led u in the right direction!

you have 1 of 2 possible problems. it will be either the fan switch is shot or the fan speed resistor is shot

check you camshaft position sensor 

hi sounds like fuel cut off switch was activated,any more information would be helpful

The fuel tank has lines that go out of it for different jobs. One of this plastic lines helps the gas fumes to breathe out in to the atmosphere throu a filter, so if this line is clogged for some reason no air can get out when you pump the gas in, so it spills it out. Locate this line and replace or unclogge it and hopefully this will cure you problem