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Any point to larger fuel lines if running a Flex Fuel sensor?

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Any point to larger fuel lines if running a Flex Fuel sensor?

Old 11-16-2018, 06:43 PM
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Default Any point to larger fuel lines if running a Flex Fuel sensor?

Sorry if this is a stupid question, but since the GM Flex Fuel sensor tube is 3/8" in diameter, is there any point in having fuel lines larger than 3/8"? Seems like the sensor would be a bottleneck if the lines are larger.
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Old 11-16-2018, 07:22 PM
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Not really....
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Old 11-16-2018, 09:42 PM
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You can split the line into 2 separate lines using Y fittings and put the flex sensor on only one of them.
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Old 11-17-2018, 09:26 AM
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Or put it on the return line?
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Old 11-18-2018, 12:08 PM
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I will probably put the sensor between the regulator and fuel rail. That will make it an easy upgrade if/when a 1/2" flex fuel sensor comes out.
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Old 11-19-2018, 08:42 PM
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There are other bottlenecks that are 3/8" in the system in the fuel tank/pump area but people still run 1/2" line from the tank to the rails. I believe a system that is entirely 3/8" will not flow as well as a system that is 1/2" and has some small 3/8" bottlenecks, but I'm not a PHD in fluid dynamics... I would still run 1/2" lines if you are using more than 450LPH to reduce pressure drop from the pump to the rails.
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Old 11-20-2018, 10:03 PM
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I'm running the stock 3/8" hard line and used the 5/16" vapor line as the return. Since I wasn't sure if this would change the set pressure with a 450lph pump. I first set it up with the return into a fuel jug where I set the pressure to 43 psi. I then connected the return through the 5/16" hard line back to the tank and the pressure stayed the same. Use open swept fittings and you can run far more than most think. I will put a pressure gauge back by the filter soon just to check the pressure there, but I doubt it's much more.
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Old 11-21-2018, 12:03 AM
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Originally Posted by 89mulletbird View Post
There are other bottlenecks that are 3/8" in the system in the fuel tank/pump area but people still run 1/2" line from the tank to the rails. I believe a system that is entirely 3/8" will not flow as well as a system that is 1/2" and has some small 3/8" bottlenecks, but I'm not a PHD in fluid dynamics... I would still run 1/2" lines if you are using more than 450LPH to reduce pressure drop from the pump to the rails.
I am getting the CHRS1313 dual 450 kit with -8 feed, -8 return, and stock vapor. I am going to be using a fuel filter that is -8 in and out, And the regulator has -8 connections. Everything from the fuel in the tank to the regulator output should be at least 1/2".
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Old 11-21-2018, 08:40 AM
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Originally Posted by FCar2000TA View Post
I am getting the CHRS1313 dual 450 kit with -8 feed, -8 return, and stock vapor. I am going to be using a fuel filter that is -8 in and out, And the regulator has -8 connections. Everything from the fuel in the tank to the regulator output should be at least 1/2".
With dual 450s, I would probably Y around the flex sensor. With a single, there isn't any need since the stock fuel line sizes are able to handle the single pump.
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Old 11-22-2018, 12:43 PM
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I can hear the fuel moving a little to fast in my 5/16 return, but it's not a critical point so I'm not worried about it, but for dual 450 pumps, I would certainly run 1/2" and I'm the guy normally saying people use to much hose.
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