Noticed a "come and go" loss of power in the past few weeks. Changed out the primary filter (it had actually clogged so bad that the suction on it caused it to collapse) and things got better.

Last night, however, I was on the highway and couldn't get it to hold about 60mph. I had a cramp in my quad from jammin on the pedal. Thought maybe a chunk of something in the pre-filter but that looked good. Maybe no air? With the rain yesterday I figured dust was way down so I took out the air filter. Didn't help.

So this afternoon I check'd the forum and someone suggested the Spin On filter. Changed it out with a Purolator from PepBoys and now I'm back to holding 75 on small hills and 70 on long ones.

Now someone set me straight. Where exactly does the spin on filter come in the fuel cycle. My impression has been that it filters just before return?

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'82 240D, 215,000 +
Classic White, Regenbogen