I would write: Installation Maintenance Servicing (note "Installation" not "Installations". ). " If "Fuel Systems" modifies all three items then it should be mentioned first and the layout should make the relationship clearer.
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JaggerlipsOur overall work speciality is generator installations with fuel systems being a particular aspect of our workSo the word "generator(s)" appears somewhere else in a way that makes it clear that the other four items relate to that?
JaggerlipsYes that is correct, it is stated in the company name.Oh, OK, that makes more sense then.