What would cause my MJ to burn rich (fuel), after (approximately) driving it 30 miles?

[KANTANKRUS]

Please advise!

Prior to the loading up, it runs fine.

[Pete M]

fuel injector leaking or stuck open?

[89 MJ]

I’m with Pete. Pull the spark plugs and post up a picture. Make sure you label what hole each one comes out of. 

[Ωhm]

Slow fuel leak at the Fuel Pressure Regulator (FPR).

[KANTANKRUS]

Heat soak, I just drove it 110 miles. It seems fine as long as I monitor the temp guage and when it climbs, I turn on the two auxiliary fans rad fans on. I installed the three fan aluminum shroud that has two electric fans for on demand purposes.