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Well technically you have fuel in the engine if you are getting a backfire in the intake. I would say the fuel is getting thru the injectors. But maybe not at the right time. Has anything happened to the timing belt or cams ?
A backfire is caused when your intake valve/s aren't closing completely before ignition in the cylinder. This ignites any fuel/air mixture left in the intake manifold. Fine tune your timing.
It is likely your timing belt/chain has slipped a notch. Remove timing cover and check valve timing and condition of belt/chain. If you need help, please let us know.
fuel lines inside the intake plhenum may be cracked and leaking inside the plhenum. same thing happened to my 1992.sonoma. they are made of a plastic material and tend to crack right in the bend of these lines.
most likely the feul pump. test the feul pressure with a gauge. look of ther little metal feul line on the intale manifold. tst pressure. have freind listen at the rear of the truck for the pump prime. key on only. then start the truck, friend should hear pump running. could also need a timming chain but pump is more tlikely
Have someone press on the gas petal while you feel the exhaust coming out of the tail pipe.It should have more exhaust coming out as the petal is pressed farther down. This method is checking for a restriction in your catalitic converter. A high flow type is best. Also make sure your air filter is clean and nothing blocking your air filters intake.
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