Won’t start…

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Hi all…
I’ve a annoying problem that has recently started with my Fourtrak after a run it won’t start again but if left a while it fires up no problem. It’s like it’s not getting fuel, all I get is cranking and no firing,the first time it happened I was close to home do just got a tow and tried a pull start but still nothing, the second time I left it for an hour and it fired up straight away like normal it’s not handy so it’s sitting in the shed now ☹️…it’s had a service recently so all filters only have a couple hundred miles on them. Glow plugs have been changed recently too,
I’m thinking it’s something to do with the immobiliser?? It’s a 2001 model, 75000 on the clock…
Anyone have any ideas??