RAM 1500 Diesel Forum banner

Did your lift pump fail? If so, when did it fail?

21 - 25 of 25 Posts

·
Registered
Joined
·
20 Posts
I just replaced the lift pump on my 2015 at 85k miles. First comment is that it is way easier to remove the bed than it is to drop the fuel tank to change the pump. Second comment is that the motor for the lift pump sits in a well that is always full of fuel. No matter how low the tank is, the lift motor will always be submerged. The well is constantly filled by the return fuel line. So, the thought that filling the fuel tank at 1/4 full will somehow save the lift motor is not the case. You can run all the way down to the fuel light coming on without concern, at least for the lift pump.
 

·
Registered
Joined
·
3,993 Posts
Discussion Starter · #22 ·
No matter how low the tank is, the lift motor will always be submerged. The well is constantly filled by the return fuel line. So, the thought that filling the fuel tank at 1/4 full will somehow save the lift motor is not the case. You can run all the way down to the fuel light coming on without concern, at least for the lift pump.
However, the hot fuel dumps right over the lift pump plus the fuel itself can't cool as quickly when the fuel level is low. Essentially, hot fuel is causing the lift pump to overheat. This is clearly more of a problem in the hot summer.
 
21 - 25 of 25 Posts
Top