Good day, my fellow Mazdaspeed enthusiast! Vincent here, back at it again with the white Vans (just kidding, I wear Nike). In today’s tech blog, I want to talk fuel pump internals. No, I am not here to debate whose internals are better or what brand offers what. I am here to help you track down and correct your low fuel pressure issue. Now, it’s no debate that anyone who’s anyone in the Mazdaspeed community will always recommend a high-pressure fuel pump internal upgrade before you start to go crazy down the mod list. But why do we want them and, more importantly, how do they work? I can confidently say that a majority of people who buy and install upgraded fuel pump internals do so simply because they are suggested it by their tuner, a forum, or a friend, but a very small percentage of people understand how they actually work, and how to correctly diagnose a problem should they ever have a fueling issue. So, grab a seat, and let’s dig in.