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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 29522
Experience:  GM Grand Master Technician 2007. 14 years experience.
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2005 duramax that is losing prime..connector

Resolved Question:

2005 duramax that is losing prime. when i re-prime fuel comes out of the connector for the fuel heater. I purchased a new heater if you could give me step by step on how to install that would be great. should i remove the entire housing first ? any special tools etc...
Submitted: 6 years ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 6 years ago.

Welcome, and thanks for using Just Answer. I am Cam, and I will do my best to assist you. When you are finished please click on accept only if you are satisfied. I don't get paid unless you do.Please do not accept if you cannot leave positive feedback. I don't know if you are a tech or a just working on your own vehicle so we may have to fine tune the answer. I only know as much about your problem as you have told me in your post, so my answers will be based on what you tell me so please add all the details you can. About your vehicle,

Does the heater come as part of the whole assembly with the plunger on the top?

Customer: replied 6 years ago.
the heater itself is inside the housing, with the electrical connector coming through the top of the housing right next to the plunger.
Expert:  GM Tech (Cam) replied 6 years ago.

Yes, but were you sold the housing then or just the heater?


Customer: replied 6 years ago.
i only bought the heater since it was cheaper and the fuel was leaking up from the port for the heater. There is an o-ring around the port but it is on the underneath side of the housing. I'm almost positive it is only the o-ring that is bad , but i had to purchase the entire element.
Expert:  GM Tech (Cam) replied 6 years ago.




Component Name

Preliminary Procedure

Remove the fuel filter assembly from the vehicle.


Ground Wire Screw


  1. Disconnect the electrical connector.
  2. Hand tighten the ground wire screw until snug.


Fuel Heater Screw


Hand tighten the fuel heater screw until snug.


Fuel Heater Spring and Seals


Take note of original spring and seal positions.

Customer: replied 6 years ago.
should i remove the fuel lines from the assembly?
Expert:  GM Tech (Cam) replied 6 years ago.

Yes, you would be best to take it out and do the replacement on the bench. Take the two 12mm bolts out, unhool the hoses and wires then set it on a work surface.

GM Tech (Cam) and 5 other Chevy Specialists are ready to help you
Customer: replied 6 years ago.