1991 Mazda B2600 will not start on 1991 Mazda B2600

My 1991 Mazda 2600 pickup has always run well. It has about 180,000 miles on it. It has sat for sometime and now it will not run. I am getting gas thru the filter and if I spray cleaner into the trottle body thru the butterfly it will run for a few seconds. I have a fuel problem. Where should I start.

Asked by for the 1991 Mazda B2600
Need to check the pressure at the fuel rail. Need to check it with a gauge