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Duramax diesel engines do not come with a factory lift pump, this is why Duramax owners see such great performance and economy gains after installing an aftermarket diesel fuel lift pump. When the factory CP3 injection pump pulls fuel under a vacuum it can introduce air and vapor into your fuel, which can lead to injector failure. The D-Max Flow Enhancer has been designed to provide your Duramax engine with a constant 8 PSI fuel pressure, aiding the injection system by reduce the amount of work your factory injection pump has to perform, extending its expected life and improving performance gains from aftermarket tuning products. Sense the D-Max Flow Enhancers is a pushing pump all fuel is placed under pressure to help prevent introduction of air and vapor, this will also extend the life of your diesel injectors.
The D-Max is well designed for stock or slightly modified trucks or budget minded shoppers, however its suggested that Duramax diesel owners install a Titanium Series pumps if you have several fueling upgrades or if you are looking for improved filtration and all the benefits that come with FASS Fuel Systems top selling Titanium Series FASS Diesel Pumps.
Posted by Ross C. Marquez, Grants New Mexico on Nov 17th 2019
I installed a 7001 Lift pump on stock Duramax. I noticed the difference with in 20 miles. The engine is smooth, quiet MPG was 17.8 to 20.0 the first 200 miles. Easy to install with my Mechanic 2 HRS. I been telling a my friends that own Duramax trucks. So far very happy the price was good!!! Installed 10/04/2019. PS The pump is very quiet.