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Upgrades for the Speed -- Fuel Pump Internals



Brandon has taken over the blog today!! Here's some helpful info if you're upgrading your Mazdaspeed 3! (of course, I helped too - I can't help but to dive in and get myself dirty on car projects! And someone had to take photos ;)



The gen 2 Mazdaspeed3 factory fuel pump internals are only capable of safely providing fuel for an intake and a tune. Past that, running more mods could cause the engine to self destruct. Obviously this is a necessary project. While it's not a very difficult one, cleanliness is absolutely critical. If you get one grain of grit in the fuel pumps piston assembly, the whole thing will fail.


The engine bay with battery box removed

Mazdaspeed3 Engine Bay Battery Box removed


This is the little guy I was trying to get to. At this point it's only a matter of removing fuel lines, a clip, and three bolts.

Mazdaspeed Fuel Pump

The camshaft driven fuel pump mounted in a vice. You really can't do this project without a good vice.

Mazdaspeed Fuel Pump

This is the business end of a fuel pump. When mounted in the engine, it's pressed against a camshaft lobe, which actuates the piston in the fuel pump.

Fuel Pump in Vice

 Fuel Pump Internal Upgrade Walkthrough


The piston removed. The fuel pump replacement parts increase the size of the piston.

Internal look at Fuel Pump


The piston sleeve.

Fuel Pump Piston Sleeve


It's recommended to completely disassemble the fuel pump and diligently clean everything with a non-chlorinated contact cleaner.

Disassembly of Fuel Pump


Small pieces. Notice the 32mm wrench I had to purchase just for this project. This thing is huge and cost me $26 for a wrench that I will probably never use again.

32mm wrench and fuel pump parts


Fuel line fitting cavity.

Fuel Line Fitting Cavity


Fuel line fitting.

Fuel Line Fitting


All the parts nice and clean after a lot of work.

Fuel Pump Disassembled and cleaned


The new Autotech Internals.  Placing the new internals into the piston retainer sleeve.

Autotech Fuel Pump Internals


Piston installed.

Fuel Pump Piston Installed


All finished!

Installation of Autotech Fuel Pump Internals


I've taken datalogs before and after the upgraded internals. Prior to them, I was dipping into the low 1600psi area. After the upgrade, it never drops below 1750psi. All clear to install the Cobb downpipe that's sitting in the box. I can't wait for the extra power!!

Accessport datalogs before and after fuel pump internal upgrade


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