2004 HD2500- purge valve apparently will not allow gas to flow from pump. How do I correct this?
engine light comes on after ding on dash which states tighten fuel cap. Bought a new fuel cap and keep it tight but the ding saying to tighten fuel cap continued. The light for engine comes on usually after use of a quarter tank off of full. Now you cannot put fuel in the truck. It pops off as soon as it starts running in. Assume purge valve damage. Where is it located?