Y do some people run a return line??? there are pumps you dont need them with

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Y do some people run a return line??? there are pumps you dont need them with

Post  racinghabbit on April 24th 2012, 11:21 pm

Y do some people run a return line??? there are pumps you dont need them with..
what is the real benifit?
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Re: Y do some people run a return line??? there are pumps you dont need them with

Post  DanH on April 25th 2012, 12:19 am

takes the load off the pump , smoother fuel flow , cooler fuel

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Re: Y do some people run a return line??? there are pumps you dont need them with

Post  BigDave65 on April 25th 2012, 12:29 am

Fuel pumps that flow big volumes of fuel, typically don't like being deadheaded against a regulator. It also makes it easier to control fuel pressure.
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Re: Y do some people run a return line??? there are pumps you dont need them with

Post  jbozzelle on April 25th 2012, 8:52 am

All of the above. I prefer a pump with a return on it, not a return style regulator.

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Re: Y do some people run a return line??? there are pumps you dont need them with

Post  yellowhorse7 on April 25th 2012, 9:17 am

jbozzelle wrote:All of the above. I prefer a pump with a return on it, not a return style regulator.

X2. Dead heading works but it is murder on the regulator. Some of the better pumps flow so much volume at such a high pressure that the regulator will never settle in. Creep turns into too much FP in an instant
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Re: Y do some people run a return line??? there are pumps you dont need them with

Post  rmcomprandy on April 25th 2012, 9:33 am

Returning SOME fuel from as close to the engine as you can get, with a regulator or not, keeps that fuel at a more constant temperature and away from any percolation which does often occur especially in a closed hood regular type vehicle. (Racing or not, the fuel doesn't know the difference).
A by-pass regulator will also keep the fuel pressure from climbing in a dead head situation.

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Re: Y do some people run a return line??? there are pumps you dont need them with

Post  LivermoreDave on April 25th 2012, 7:25 pm

We had a situation using a very good mechanical pump (SBF factory location) at the end of the run causing an over-rich condition to the point of stalling the engine. If memory serves me correctly, this problem was present at 6 PSI. We looked into return regulators and such to solve the problem until we found we could operate the engine at 4.5 PSI to 5 PSI just fine! One wouldn't think a pound or so of fuel pressure would make that much difference, but it sure helped with our situation, fuel pressure rising after demand.

As to high pressure applications, whether mechanical or electric, factories are using return lines for some reason, maybe as have been mentioned!

Dave.

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