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Having the Right Filters Can Be A Big Deal

Fuel Filter Installed - typical fuel injected vehicle

Recently in our forums, user tomcat4343 reported problems with a PowerStroke engine after having changed the oil and fuel filters and done the usual engine cycle to clear the lines of air. This didn't work, so he resorted to using a bleed tool to get air out of the fuel delivery system. This still failed to work.

The first problem is common with engines, especially diesels, after filter changes. Getting the air out of the system can be rough going, which is why bleed tools exist (or are made, as in this case). If done correctly, this bleeding should do the trick and get the engine running. In this case, of course, it didn't.

For those looking to make a bleed tool for a 6.4L PowerStroke engine, forum mechanic Big Block 409 offered a video link to show how it's done.

In the end, the user with the problem finally reported his solution. He double-checked all of his work prior to the issue, namely the changing of filters, and noted that the fuel filters looked wrong. Turns out, they were the wrong type for the engine and lacked the air purge valve required of a filter for this engine. Replacing the filter with one recommended by the manufacturer solved his issue.

Sometimes, the problem at hand is really as simple as the cheapest replacement made. This is a reminder that it's easy to overlook the simplest problems when the symptoms seem so much larger.