# Fuel rail

**URL:** <https://forums.speedlife.net/t/fuel-rail/203264>\
**Category:** PittSpeed Automotive\
**Created:** [July 24, 2009, 10:25am UTC](https://forums.speedlife.net/t/fuel-rail/203264 "2009-07-24T10:25:42Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![Sinner6.0L](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/sinner6.0l/32/6016_2.png) [@Sinner6.0L](https://forums.speedlife.net/u/Sinner6.0L)\
**Post date:** [August 2, 2009, 5:45pm UTC](https://forums.speedlife.net/t/fuel-rail/203264/5 "2009-08-02T17:45:07Z")

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electrical returnless needs a pulse width modulated, pcm controlled fuel pump to vary volume to the rail. since there is no return the exact amount of fuel must always be delivered to the rail. this requires precise control of the pump output. in a return style system the pump runs all the time and at one speed, this is not the case with returnless

> [@New here....](https://forums.speedlife.net/t/new-here/40637/15):
>
> i’d find a contour forum to know for sure

that’s what i’d do

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