fuel pump/ line question
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Instructor
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fuel pump/ line question
71 C3 with small block
What is the second line coming from the gas tank to the fuel pump and its purpose?
Can it be blocked off and a standard fuel pump be used in place of the stock one?
What is the second line coming from the gas tank to the fuel pump and its purpose?
Can it be blocked off and a standard fuel pump be used in place of the stock one?
Melting Slicks
Joined: Mar 2008
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From: Austin Tx
It's a fuel return line, I would recommend you get a correct fuel pump, with a return. The return will help prevent vapor lock.
You can block off the return, and go with a pump without a return, but if you start having issues with poor performance, and hard warm starts, you know what the cause was.
You can block off the return, and go with a pump without a return, but if you start having issues with poor performance, and hard warm starts, you know what the cause was.
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Joined: Jul 2001
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Thread Starter
Instructor
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Why does it return anyway? Does the pump have an internal regulator or something?
Thread Starter
Instructor
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Race Director
Joined: Mar 2006
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From: Florida
The return prevents vapor lock and the oem pump has a crude form of regulator in it as do all oem pumps, not all have the return port.
Call or email this guy, he knows fuel pumps including the gph of the original pumps and will give you some real answers plus steer you in the right direction.
Also priced right when compared to most other high hp pumps.
http://www.racepumps.com/StreetIndex.html
Last edited by noonie; Jun 9, 2012 at 03:28 AM.
Race Director
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I've seen guys running up to 600HP using a stock 3 port pump. The return line allows a small amount of fuel to recirculate back to the tank ensuring that there is constant flow of cool(er) fuel entering the pump to avoid vapour lock. There is no regulator of any sort in a stock pump, nor does it need one.