If the engine fires but won't start , could it be a faulty erg valve?

What is your question?

The fuse was checked it's good, the erg valve was checked it was good. They bought a sensor from parts store and replaced old one and the car cranked up and they got it home. Turned engine off and tried to crank it after about 45 mins. Nothing, but you could smell gas real bad. They checked era valve again and the cap had not been replaced and fuel was coming out of valve. The core stem was pulled and replaced. The car cranked right up. Went to check car again this am and nothing. Do you think the erg valve is still losing pressure?

What makes this problem better or worse?

Runs fine until turning off engine and no recrank

How long has your 1995 GMC Jimmy had this problem?

2 days ago