Have you done a compression check? and you might want to check the map sensor its above the blower motor on the pass. side firewall and what is the pressure on the fuel rail? should be between 45 and 52 i think not running
The most common reason for this issue is that the connection to the gas tank or tanks is rotten or disconnected that leads to the fuel pickup on the top of the tank. If so, you can buy wiring kits or a snap package that leads to the fuel pickup mounted directly above the tank. The quickest way to see if this is the problem, is to check to see if the gauge is working. If not, it's almost a sure thing.
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Did you check for spark at any ot the spark plug wires/ coils? If there is, check for fuel pressure at the fuel rail. Take the port cap off and connect a fuel pressure gauge. If one is not available, with a pocket screw driver deppress valve at port and observe if fuel pours out. If no fuel comes out at all, check your fuel pump circuit. Check for good ground and power at fuel pump connector. If power/ground are ok, replace fuel pump. If spark and good fuel pressure is present, there is the possibility of engine mechanical issues(jumped) timing chain). Also, a plugged catalitic wont let engine start but its very unlikely thats your problem. Start with your basics: spark, fuel, engine mechanical and catalitic.
Since the engine cranks, the battery, starter motor/starter motor solenoid are most likely good, so suspect everything else on the list. When you narrow it down, re-post with a more specific question about that particular component, since 100s of components must operate nearly perfectly for a vehicle to actually start.
Priority Action Part Type -- Cause 1 Inspect Battery -- Battery Discharged or Faulty. 2 Inspect Battery Cable -- Corroded, Broken, Shorted or Poorly Connected Battery Cable. 3 Inspect Battery Cable Connector -- Broken/Corroded/Loose. 4 Inspect Fuel Filter -- Clogged or Dirty Fuel Filter. 5 Inspect Ignition Coil -- Faulty Ignition Coil. 6 Inspect Wireset (aka Spark Plug Wires) -- Worn, Damaged or Faulty Spark Plug Wire(s). 7 Inspect Spark Plug -- Incorrectly Gapped or Fouled Spark Plug(s). 8 Inspect Starter -- Starter Motor Faulty. 9 Inspect Fuel Pump -- Low Fuel Pressure. 10 Inspect Solenoid Switch -- Faulty Starter Solenoid Switch. 11 Inspect Fuel Pump Relay -- Faulty Fuel Pump Relay. 12 Inspect Fuel Injector Pressure Regulator -- Faulty Fuel Injector Pressure Regulator. 13 Inspect Ignition Switch -- Improperly Connected or Faulty Ignition Switch. 14 Inspect Starter Drive -- Faulty Starter Drive. 15 Inspect Fuel Injectors -- Dirty or Worn Fuel Injectors. 16 Inspect Fuel Pump Strainer (inside fuel tank) -- Clogged or Dirty Fuel Pump Strainer. 17 Inspect Engine Control Computer -- Incorrect Operating Information Being Delivered and Sent From The EEC (faulty computer) 18 Inspect Fuel Tank -- Fuel Tank Empty. 19 Inspect Carburetor -- Carburetor Flooded or Faulty Choke. 20 Inspect Distributor Cap -- Worn, Loose, Cracked, or Incorrectly Installed Distributor Cap. 21 Inspect Distributor Rotor -- Worn, Loose, Burnt contact surface 22 Test/Inspect Neutral Safety Switch -- Faulty Neutral Safety Switch
Have you checked your fuel pressure. You may have a bad fuel pump. If you have good fuel pressure take a good look at your cap and rotor. 4.3 liters have a notorious cap and rotor problem along with a coil wire issue. The coil wire can rub on the firewall or other places and cause you problems. I would start with checking your fuel pressure with a fuel pressure gauge.
You need to check the fuel pressure with a fuel pressure tester.Then you will know for sure if the fuel is reaching the engine or not.If you don`t have a tester spray carb.cleaner into the throttle body and if the problem is fuel it should start momentarily.Anytime you change the pump you should also change the filter to.If it does not start then you need to check for spark at the spark plugs.Check cap and rotor and make sure rotor does not have a hole in the tab that contacts the cap plunger.This will cause a no start.Hope this helps.Good luck.
Air - not likely the problem ! mechanical cable controlled throttle body
Fuel- make sure there is gas in tank! fuel pressure test at the throttle body or rails, if no fuel check power to fuel pump: ignition power to breaker or fuse, relay , power to pump at 3 pin connector near tank/frame rail on drivers side, - if pump is runniig but insufficient pressure, check for mechanical restriction: plugged filter broken or pinched line, plugged pickup tube in tank. if good pressure to rail or body, check ecm : diagnostic codes, fused power, ecm tells injectors when to open, dependent upon several sensor parameter inputs.
Spark- ignition - coil-distributor-ignition module (or coil packs)- wires-plugs-ignition module (signals coil to discharge, mounted beneath distr cap) work backwards from plugs.