Enterprise Products Partners (NYSE: EPD), Energy Transfer (NYSE: ET), and MPLX (NYSE: MPLX) are some of the best passive income producers in the energy sector. The trio of master limited partnerships (MLPs) offers big-time yielding payouts that should continue growing in the future.

Their brilliance at producing passive income seems to have caught the market's eye this year as all three have rallied. Here's a look at whether it's too late to buy these income machines.

Units of Enterprise Products Partners have risen more than 10% this year, which is a hefty gain for an income-focused investment vehicle. The valuation increase has pushed the MLP's yield down to around 7.5%. That's still attractive, considering that the dividend yield on the S 500 is around 1.5% these days. 

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Source Fool.com