UK Car Repair Questions? Ask a Mechanic for Answers ASAP
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You may have quite a few things going on. I'm assuming that no fault codes were found, in which case you most likely aren't losing spark alone.
A loss of fuel pressure will usually cause the engine to hesitate or lack power as it dies rather than feeling like the key was shut off. A loss of fuel pressure would most likely be the pump but could be a loss of power or ground to it.
Does the engine die abruptly like the key was shut off or does it hesitate?
this sounds like a lack of fuel and could be a lack of fuel pressure from the electrical pump at the tank.
If the connections to the pump are corroded or damaged then the pump could stop at any time or could not be running at full speed. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse,
Ideally measure the pressure at the injectors and if this is low check the pump as described and also consider changing the fuel filter as if this partially blocked this too will reduce pressure.
to replace a filter is about 0.5 hours labour and £20 in parts
and is the relay is faulty then this about £5 in parts and 10 mins to swop
I'd bank on a small garage needing about an hour to test the fuel pressure , fit a new filter if required
if the pump is faulty though this is bit more expensive (about £120 in parts) and an hour to fit
do you still need help?
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