Fuel pump cummins

Warranty by product type. Search for: Search. Continue Shopping. SKU: Injection Pumps. Part : DRX. Make: Cummins. Model: ISB. In Stock Ready to Ship. Ships Today! Quantity: Quantity. Share Product. Description Warranty Cross Reference. Tips from the Auto Shop. Having Trouble Locating a Part? This Weeks Hot Buy. Sort By. Show per page Show per page Cummins Fuel Pump In Stock. Cummins Fuel Transfer Pump Out of Stock.

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As mentioned above, we have made several hundred tests using precise flow meters and accurate pressure gauges. Sometimes our assumptions were very close and other times the readings didn't make sense.

The findings that didn't match hydraulic principles, forced us to dig deep to find out why. Remember, one good test is equal to a thousand expert opinions. T he lift pump has a bore of 1. With the bore diameter and stroke dimension, we can calculate the cubic inch displacement. The stroke dimension appears nowhere in any publication or forum.

Without the critcal stroke dimension, it became necessary to measure a cam. The 12 valve Cummins features a cam lobe which activates the plunger on the lift pump see photo. The cam turns at one half speed of the crank. My 98 Cummins was exactly the same at. We now have the bore diameter and stroke dimension. Calculating the pump's displacement and GPM flow is very easy.

Contrary to popular belief, the Cummins lift pump produces flow on the return stroke of the piston, not the forward stroke. Spring pressure on the return stroke, NOT the forward plunger movement, is what produces the flow in the fuel system.

In article number three, you will discover why you cannot efficiently run your fuel pressure higher than 32 PSI. How do we determine the calculated displacement of this pump.

Here is a handy formula to determine cubic inch displacement of any cylinder pump or engine. This formula is easy and works great for finding the cubic inch displacement of your engine or any piston pump. Bore x bore x stroke x. We now know that our lift pump displaces. How do we figure the calculated GPM flow of the lift pump? The formula is very easy. The carter lift pump is calculated at 1. We are now going to use the formulas.

Please bear with me, it's straight forward, and rather easy. This is the actual flow from the Carter lift pump at idle. What is the calculated flow of this piston pump?

So, we now take. Not the best efficiency number, but OK. My apologies for the faint image. Are you starting to see a trend? As the RPM increases, the efficiency goes down!! At RPM, we are flowing. We reached peak flow of. If you installed a RPM governer in your P pump, your fuel flow is in the neighborhood of. My mathematition son, Curtis, arrived at this number by using calculus.

So, our Cummins lift pump is capable of flowing 1. I'm here to tell you that the Carter lift pump is no way near its calculated GPM flow of 1. Not even close!! The Carter lift pump only flows. It flows. That's at peak fuel flow.

At rated RPM it's much worse! The following numbers were arrived at by using calculus. F rom an industrial point of view, this lift pump would have to be replaced with a better, more efficient design. There are several reasons why the efficiency of the Cummins lift pump is so low and it's not the pump's fault!!

The secrets on how to improve your fuel system will be revealed in article number three. When the fuel system on the 94 to 98 Dodge Cummins was designed, they failed to follow basic hydraulic principles.