2000 Ram 2500 24 valve diesel.

Recently added a aftermarket performance lift pump. Amazon special.

Prior to install I removed the fuel tank and cleaned entire tank, used air to blow out fuel lines.
Added a inline pre pump filter on the frame rail.

Fuel pressure at vp44 prior to install was 9psi at idle and would drop to about 6psi at wide open throttle, Old lift pump was a Carter.

New lift pump at idle is over 18 or 20 psi. and at wide open throttle drops to about 14 or 15.

Only guessing on the idle pressure because the current fuel pressure gauge is a 0 to 15 and will peg out all the way back around to the zero tab.

New 0 to 30 psi gauge has been ordered.

My concern is the temperature of the new lift pump. After about 15 to 20 mins of driving the casing on the new lift pump is so hot that its almost too hot to touch.

The wires for the new lift pump are about 16 gauge and about 4 or 5 inches long.
Just seems like the 12 volt dc motor is sure hotter that heck and would hate to see a failure of the electric motor or pop a fuse out on the road for the lift pump.

Any ideas on what a 12 volt DC fuel pump motor temp should be?

Below photo is the type lift pump that has been installed.

 

1. Upgrade wiring: The 16-gauge wire may be too small; consider using 12 or 10-gauge to reduce resistance and overheating.
2. Check fuel flow: Ensure the inline pre-pump filter isn't restricting fuel flow, which could make the pump overwork.
3. Pump suitability: Verify the pump's pressure rating to ensure it matches your system and isn't overworking.
4. Typical temp: 12-volt DC fuel pump motors typically operate at 150°F to 175°F; overheating beyond this could indicate a problem.