Question about Cars & Trucks
First, lets be clear with terms. To crank is to turn the engine over, you can do this manually with a wrench on many vehicles. It requires no spark or air. To turn over or to fire is when you achieve combustion. Example: You could pull the spark plugs on a vehicle and turn the key and it would crank, but it wouldn't fire or turn over.
Now it sounds to me like your vehicle is cranking but not firing unless you pour gas in it. My first thoughts are fuel system. I'm assuming it can't be fuel pump because it runs once it fires. Perhaps the fuel pump isn't priming itself, or perhaps somehow air is getting in the line between the injector and fuel pump? Test the fuel pump first by turning the car from off to on (not starting, just on). You will usually hear a short buzzing noise coming from the engine bay that stops shortly afterwards, that's your fuel pump pressurizing the line. (Pro Tip: If you ever try to take your key from off to straight to start and the vehicle doesn't start on the first try, but does the second time no problem, try delaying at on for a moment before trying to start. This gives your fuel pump time to pressurize the line.) Assuming your fuel pump is charging the line, the next place to look would be at the path the fuel takes to the throttle body. When you crank it over and it doesn't start, are you getting any fuel? If you can't see where the fuel enters the system try smelling the exhaust while cranking without it firing, if it smells of fuel you're good and need to look at air flow and spark, if not it's a fuel issue.
Past that, I'll leave it to someone more experienced than myself, but that would be how I troubleshot my own vehicle.
Posted on Oct 17, 2013
Have fuel pressure checked. lots of problems come from this.
Posted on Oct 17, 2013
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Posted on Jan 02, 2017
SOURCE: cranks but no start
this might not help you, but, just yesterday i bought a 98 k2500 that wouldn't run. guy i bought it from said he was driving it and it just quit. after checking all the usual items, i replace the coil wire and it fired right up. i ended up replacing all the plugs and wires and it runs and idles very well now. hope this helps someone.
Posted on Mar 22, 2009
if u pour fuel in the throttle body n cranks then goes dead u may want to check your fuel injectors see if they're actually working , u say your fuel pump is good maybe not the injectors
Posted on May 27, 2009
what engine does it have? 2.8 ? if so replce pick up coil in distributor /4.3 and 2.5 will do this also it affects pulse to injectors and on time firing
Posted on Jun 30, 2009
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