Pulled my box off for an easier install for the Fass. Does this look like an in tank pump retrofit? Does anyone also know what this port should be connected to? Is it just a breather ?

I believe it is a vent / rollover protection valve.  It should be present on all fuel modules.  I have one on my fuel tank module.

 

- John

48 minutes ago, Tractorman said:

I believe it is a vent / rollover protection valve.  It should be present on all fuel modules.  I have one on my fuel tank module.

 

- John

 

Correct. Tank vent with a rollover valve. Make sure the nipple is clear and not blocked. 

On 2/28/2023 at 5:03 PM, Mopar1973Man said:

 

Correct. Tank vent with a rollover valve. Make sure the nipple is clear and not blocked. 

How would I know if I have an in tank pump? I’m out of town for work so I don’t have access to the truck. Only that picture I took of the electrical on top

Look at the engine where the lift pump should have been. It will be an aluminum bypass block and the wiring has been extended toward the rear.

 

Your photo shows four wires connected to the module.  This indicates there may be an in-tank pump.

 

- John

 

If it was a dealer retrofit, there may also be a relay hanging in the corner of your engine compartment, driver side by the firewall.