My van was having a starting problem I was able to start it fine in the morning
But once I let it sit for ahour and I tried to start it I would have to crank it to
Get it started.. It runs fine no misfire or stutter.i took it to a shop and they told me I needed a tune up so I changed plugs wires coil and air filter and still
I am having the same problem so I took it to another shop and they said I need a crankshaft sensor so I replaced it and I am still having that problem .
No codes no check engine light on .any advice would be greatly appreciated

 

I would hook up a fuel pressure gauge and let it sit. If the pressure drop more than 10 psi in 5 mins, then you may have a fuel bleeding back into the tank. Fuel pressure spec is 48 give or take 2 psi.