Glossary / General

P pump

9 Episode Mentions
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Too Afraid to Ask

A diesel “P pump” is part of the fuel system that meters and pressurizes fuel before it’s injected. When the pump design changes, the engine may need a different piston bowl shape so the fuel burns correctly.

Technical Definition

“P pump” refers to a specific style of diesel fuel injection pump used on some mechanical-injection setups. Changing the injection pump (and its calibration) can alter spray pattern and timing, which often drives piston bowl shape changes for emissions and combustion control.

Hear It Discussed

"controlled injection pumps like a P pump for a Cummins and you can backdate it to the mechanical injection pump."

Mercedes Engine Swap King Matt Kwiek The Smoking Tire 50:14

"Does that number change a bit if we go to say 12 valve like a p-pump truck or VP 44 like how does how does that reliable daily driver number change?"

Greg Alberalla Gives Tips for Upgrading a Cummins The Diesel Podcast 37:24

"We were hitting about 1800 on the dino and we were a P pump and everybody else said these common rails."

How Myer Set The All Time Points Record At UCC 2026 Power Driven Podcast 09:20

Cars Known For This

Ford F-250 Ford Falcon Mercedes-Benz 500E Mercedes-Benz G-Class

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