In the approach phase, engine 1 of [Cathay Pacific flight 780](https://en.wikipedia.org/wiki/Cathay_Pacific_Flight_780) got stuck at about 70% N1 and it forced the crew to do an overspeed landing (230knots).

Why didn't they shut it off by turning the fuel pumps off? Is there a backup mechanism if the fuel valve fails like in this scenario?
['https://aviation.stackexchange.com/questions/59303', 'https://aviation.stackexchange.com', 'https://aviation.stackexchange.com/users/36788/']
Aside from what Unrec. and GdD point out, even if the other engine had been running perfectly... 

A frequent problem with twin engine airplanes is **[shutting down](https://en.wikipedia.org/wiki/Kegworth_air_disaster) the [wrong](https://en.wikipedia.org/wiki/TransAsia_Airways_Flight_235) engine**. Nobody ever expects or plans to shut down the wrong engine, but it happens anyway. 

So a crew is very cautious to shutdown an engine that is working.
I could be wrong but reverse thrust from the running engine helped to stop the plane1 as it was approaching at a great speed way over the recommended landing speed, so shutting the running engine off right at approach would have made the plane to overshoot the runway, making the situation worse.

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1: Source:

> 
> [...] The aircraft then rolled left seven degrees and
>  pitched down to -2.5 degrees at the second touchdown during which, the lower
>  cowling of No. 1 engine contacted the runway surface. Spoilers deployed
>  automatically. **Both engine thrust reversers were selected by the Commander.
>  Only No. 1 engine thrust reverser was deployed successfully and ECAM message
>  “ENG 2 REV FAULT” was annunciated.** Maximum manual braking was
>  applied. ... *[[Accident report](https://www.webcitation.org/6Rk7TGDPW?url=http://www.cad.gov.hk/reports/2%20Final%20Report%20-%20CX%20780%202013%2007%20web%20access%20compliant.pdf), page 26. Engine #1 was the one that was stuck at 74% N1.]*
> 
> 
>