2004 Yukon Cranks Won't Start

[harless]

I have an 04 Yukon with almost 300,000 miles. I had a battery going out the last month needing frequent jumpstarts and I finally changed the battery. Now the engine cranks over but it won't start. The fuel pump was replaced about 2 years ago so don't think that's it. Wondering if something is wrong in ignition in relation to battery change?

 

[strutaeng]

Even though fuel pump is relatively new, I would still check for fuel pressure.

Also check for spark at multiple plugs.

Report back what you find...

 

[Scottydoggs]

check fuel pressure.

 

[harless]

Smelling gas every time I crank it, think it's no spark.

 

[Scottydoggs]

Smelling gas every time I crank it, think it's no spark.

sounds like a leak, lines rot, connections fail. why you should check the pressure. you can check it at the shrader valve on the fuel rail. test gauges can be found at most parts store via the free rental deals.

 

[Doubeleive]

sounds like a leak, lines rot, connections fail. why you should check the pressure. you can check it at the shrader valve on the fuel rail. test gauges can be found at most parts store via the free rental deals.

meh...on these truck's pretty unlikely. you might get a failed o-ring on the fuel rail but that likely wouldn't prevent it from starting.
op either way
3 things need to happen
fuel+spark+air
check in that order

 

[Doubeleive]

if you have fuel and no spark or no injector pulse check for ground on the harness

 

[S33k3r]

Especially the ground behind the engine on the passenger side. If you know enough, take a look at the ECU connections, in the engine bay. One or more wires there could be rusty/be rusted through.