E46 M3 Fuel Pump Replacement

My fuel pump in the new #12 Hi-Speed x TC Design E46 M3 racecar was transferred over from the crashed original E46 M3. The pump actually broke apart into several different pieces in the impact, but I was able to put it back together with no visible damage. It was just the plastic pieces that were knocked out of place, or so it seemed. While we had no performance issues with the fuel pump, it was making a louder than usual whine along with not displaying the accurate amount of fuel on the gas gauge. Both of which are unnerving while driving on track wondering if the pump will fail during a race, or if I even have any fuel left.

We run a dual fuel pump setup on the E36 and E46 racecars because of the saddle tank design. The g-forces with aero and some grippy Hoosiers means that often all of the fuel will slosh to one side of the saddle tank through a turn. Cars often experience fuel starvation despite having half a tank of fuel which is a solid 8 gallons. With the dual fuel pump setup, there is a fuel pickup on each side of the saddle and it prevents fuel starvation through the turns. We can run the tank down to less than 1/4 with no fuel starvation issues.

A fuel pump can start to fail for a myriad of reasons. Often age is a factor in these cars that are still on OEM pumps. A failing fuel pump often has a much louder whine than usual when it is pumping fuel. If it gets really bad, it might even sound like the groan of a dying animal. Pumps can overheat and get burnt out if they are being run with no fuel in the system. The end result will be the same where your car will no longer start. Remember the three things you need are: Fuel, Spark, and Air.

The process for changing out your fuel pump is very straightforward and you can DIY it at home in about 30 minutes.

Check it out in the video above and don’t forget to subscribe! This is the first video with the new #12 but you’ll get to see more of it this year!

APEX Pro: The Simplest Way to Utilize Track Data

The APEX Pro touts itself as a digital track coach to help you utilize data and go faster at the track. Most data acquisition systems require the use of a laptop and post session data downloads before attempting to decipher those squiggly lines. The APEX Pro eliminates this and allows you to immediately view all the data directly on your iOS device after a session. The green and red lights make things easy as you see them in your peripheral vision.

Give the unboxing and review a watch to learn more about the APEX Pro. For a free phone mount with your purchase of a unit, use code “apexprochristina” on checkout after adding both to your cart.

AKG Motorsport Stage II Shifter and DSSR

During Tian’s SpecE30 race at VIR, he went to shift from 4th to 5th on the front straight and his OEM shifter snapped off! While he managed to do a paddock repair to get him through the weekend, we decided to do some upgrades on his car so he would be ready to rock for the next race.

AKG Motorsports has been a sponsor of my racing endeavors since my E36 M3 back in 2017. They have continued their support on my E46 M3 and we run essentially the entire catalog of offerings for the E46 on my car.


I’ve always loved the quality of the parts from this company so I thought it best to grab some of their Made in USA parts for the SE30. We ordered the Stage II shifter and DSSR to go with it. Check out our unboxing and install video for action from Tian’s race and to see how easy it is to install the new shifter.

Be sure to subscribe on YouTube for more videos! 🙂