And remember, while pressure is definitely an important factor as this is the rate at which fuel is dispensed, volume is equally, if not more important, as it’s the amount of fuel. But unfortunately, due to these pumps’ inability to actually produce volume, the pressure drops off considerably as load increases. The factory lift pumps on the 2003-2007 Cummins produce a dismal 10-11.5 PSI at idle.
A lack of lift pump flow will not only cause a no start issue, but depending on how it failed, can cause other issues that we will discuss further into this post. First off, let’s get this out of the way, Ram trucks NEVER had the best luck with lift pumps. You then ask yourself, “Tyler, what now?” Don’t worry sad no start truck, we’ve got your back! Let’s now dive into the fuel system. Overall, make sure that when you test the battery, you are doing so under load by cranking the engine and watching the voltmeter. It is very common to have a battery read around twelve volts on a surface charge, but then drop well below nine (the minimum voltage to allow for cranking on 2003 to current Cummins) when under load. When I say battery voltage, I am not talking about just getting a voltmeter and putting it on the positive and negative posts, as you will only get what’s called a surface charge, which won’t tell you what’s actually going on when the battery is under load (i.e. The very first thing that needs to be checked is battery voltage. Tyler has been elbow deep in diesel engines for years, especially Cummins, so he is a wealth of information when trying to cure a plagued engine. In order to help out, we had our very own Tyler Lucas, put together this step by step tutorial that you will hopefully find insightful. We must have developed quite a name for ourselves over the years, as frequently we even get calls from shops that are scratching their heads, hoping we have the golden ticket, and fortunately, we usually do! One of the most common calls we get are from customers with a 2003-2007 Cummins that have developed either a hard start or no start condition. Fortunately, we’re typically able to help diagnose and give recommendations for products or procedures to remedy the issue.
We get a lot of calls on a daily basis with customers trying to diagnose some type of issue with their truck.
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