GRiSO no spark both cylinders

2 weeks a go no start.
Checks plugs, no sparks. Measured faulty plugs.
Changed plugs and fired her up.  
Ran better than before though the plugs where 5000km old.
Strange both plugs went down at the same time.

Yesterday again not firing up.
No sparks, but plugs are okay (interchange it in my Vespa)

Thing to me is that both cylinders are not firing.

Does the battery has got something to do with it? (12.4 volts before starting. After let's say 5 attempts the batt is to weak for turning the startermoter)
Please advice.

Ed

Are the injectors firing? Sounds like phase sensor to me. What, if any, codes are showing on the OBD in the dashboard?

Busy with it as we speak.
ECU codes 54
dash code 03 / 06 / 07 /08

I dont smell any fuel.
possible there's no fuel injected while attempting to start.

54 is phase sensor from memory. Don't buy the Guzzi part. It's stupidly expensive get one off the Bay of Fleas.

are we talking about
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located under tank?

Thanks for your quick advice Pete.

Yup. It's shimmed for depth so measure it against the dead one and shim accordingly.

Indeed expensive cable. Let's give it a try.

And running again. Thanks Pete!
At first i thought the new Beetle map in combination with Mass exhaust was the issue for bad running between 2000 and 300 rpm.
Went back to stock but it was still there.
Than no spark both engines. Replaced plugs but after 100 km no spark at both.
Measured plugs and plugs ok.

Replaced magnetti Marelli se813 phase wire with one from Facet.

Boem!!!!  up and running.
Tomorrow back to Beetle map.