Jump to content
  • Welcome Guest To Mopar1973Man.Com

    We are a Dodge Ram Cummins Turbo Diesel forum. We are very friendly and helpful group of Dodge Ram Cummins owners. We will try to keep your truck running the best we can and provide information for diagnostics, repairs and even guide you on the best replacement parts to use. 


    Registration is free. Registering on the site will provide access to many more things like...

    • Contribute to the Forum being able to ask questions and get support for your Dodge Ram Cummins.
    • Contribute to Article Database adding your ideas and suggestions.
    • Classified Ads posted by the members. Post up your used parts and vehicles.
    • Member Garage where you can proudly display your vehicles and modifications that you have done to them.
    • Download files, documents, and Quadzilla Adrenaline tunes for your truck.
    • 911 Support Network. We've got a group of members will to aid you if your truck breaks down on the road.
    • Reduced Advertisements displayed to you.

Sign in to follow this  

Pre-start Fuel Pump Power

Recommended Posts

I let my fuel tank get below 1/4 and the "near empty" idiot light came on. Normally when I turn the key to ON, the fuel pump runs for a few seconds and gets the fuel pressure up to about 10psi. The next time I started it, the fuel pump didn't do ite pre-start run. The engine started normally and had normal fuel pressure. I filled the tank, the idiot light went OFF but the fuel pump still didn't do its pre-start run. A few starts later, and everything was back to normal. Is this a feature or a failure? :cookoo:

Share this post

Link to post
Share on other sites

Most critical numbers in my mind is... 1. HFRR score of the current fuel meeting the requirements of the VP44. (Lubricity value) 2. The fuel pressure at wide open throttle operation. Bosch requires the fuel lubricity to be of a score less than 400 HFRR for long life of the injection pump. But todays fuel averages right around 520 HFRR. I'm using 2 cycle oil to beef up the fuel lubricity but there are several products that do a really good job of adding lubricity. http://mopar.mopar1973man.com/cummins/general/2-cycle-oil/hfrr/hfrr.htm Then since there is only fuel to lubricate the injection pump during its maximum amount of stress at WOT operations should be enough fuel pressure to keep it lubed. Dodge/Cummins suggest 10 PSI as a minimum I suggest a minimum of 14 PSI. Beyond that enjoy your Dodge Cummins Truck... :cummins:

Share this post

Link to post
Share on other sites

That 2-stroke diet was one of the first things I learned from your site. As far as enjoying my Dodge...I'm starting to. I'm definitely enjoying the Cummins part more.

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this