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No gas, plugged fuel filter? Turn on the key but don't crank engine, listen with door open towards gas tank. You should hear a click and a slight motor pump noise for a couple seconds. If not then your sending unit failed.
If it is a carburated engine it should have a mechanical fuel pump on the side of the engine, if this is the case it will only pump gas when the engine is cranking or running. Disconnect fuel line at carb, crank engine and see if it pumps gas out of line, if not check filter and lines from carb to tank for stoppage or bending but more than likely you will have to change fuel pump.
My first question would be is the injector spraying when you crank it ? The way its supposed to work, the fuel line to the tank should have about 10psi of pressure before you crank the engine. When you turn the key on the pump gets power for 3 seconds to boost the pressure. The pump stops working until the engine has oil pressure which takes a few seconds. If the base fuel pressure leaks back to the tank, or the pump relay is not powering the pump, you won't have any fuel pressure or spray until you get oil pressure.
Hello sit in side turn key to on position do not crank engine you should hear a grunt sound like grrrrr this is your fuel pump if you do not hear this your fuel pump is not working and will need replaced .The smell your smelling is that of high either spray in your engine.
you have a fuel pump relay . Check to see if the fuel pump is humming when you turn key. check for proper ground for fuel pump. try spraying some carb cleaner into the intake then attempt a start. The engine will run for a few seconds, this will verify spark. corosion at the electrical connections is always a possibility. and lastly can you get the engine running by opening the throttle when starting?
Make sure your air filter is clean and you are using brand new petrol. If you left old petrol in it it may have clogged up the carb. It sound like no fuel is getting to the spark plug. If you have a rubber priming bulb, press it slowly and regularly to try and keep the engine going once you have it started on starting fluid. Good luck.
Checking for spark is really simple while fuel delivery is more complicated because of the the way it is metered for delivery. On VW's a fuel pump relay is used and a jumper cable connected to relay box. This controls the fuel pump to deliver fuel manually. With a fuel pressure gauge connected to the line from the pump continued withing the system, you assess whether you have correct fuel pressure, maintain it within a specif duration. Electronic fuel injectors do stick or stay open causing very poor or no start condition. Make sure you have fuel delivery since you are positive that spark is present.
Have you checked the fuel pressure? Fuel pumps are a common failure item on those trucks. Pick up a cheap fuel pressure gauge and hook it up to the shrader valve on the fuel rail. With the ignition on and you should have 55-65psi. Even if it's a few psi below spec it could stop the engine from firing.Once you determine the fuel pressure isn't adequate make sure you have a
good power and ground at the fuel pump. If that checks out, time for a new fuel pump module. I recommend only replacing it with an AC delco unit, I've heard bad stories about aftermarket replacements. You could also spray some carb cleaner or starting fluid in the throttle body and crank the engine over. If it runs for a few seconds after spraying starting fluid in you know you have a fuel delivery problem.
The pump is only suppose to run for 3 seconds if the engine is off. It will only stay pumping if the engine is running so the circuitry seems to be just fine. You prabably just got a bad pump again. Its common for repair shop to put 2, 3, and 4 pumps sometimes before they get one that works. We find it very common that a gauge will malfunction and the real problem is you just ran out of gas.