2.9 XR4x4.

Won't start. Battery's fine, got a good spark, so I'm assuming it's a fuel problem.

Did start twice, ran for around 5 seconds both times, then stopped. Wouldn't start again till next day, then ran again for only five seconds.

Don't know these cars well at all. Where do I start?

(Have tools, have Haines manual, working at roadside.....)

Thanks, Guys.

Al