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-   -   Fuel pressure regulator return line. (http://www.clubcobra.com/forums/weber-tuning/88681-fuel-pressure-regulator-return-line.html)

Snakebit 06-23-2008 12:09 PM
Fuel pressure regulator return line.
 
Installed my Webers. Using a Mallory fuel pressure regulator rated 3to 9 lbs. The fuel line is AN6 and the return line is AN4. Fuel pump is a Carter mechanical street pump putting out 6lbs. I can not get the pressure to adjust below 6 lbs. It should be around 3 lbs or less for Webers. Any sugestions other than tearing apart half the car to install an AN6 return line?

Gaz64 06-23-2008 01:12 PM
Quote:
Originally Posted by Snakebit (Post 854554)
Installed my Webers. Using a Mallory fuel pressure regulator rated 3to 9 lbs. The fuel line is AN6 and the return line is AN4. Fuel pump is a Carter mechanical street pump putting out 6lbs. I can not get the pressure to adjust below 6 lbs. It should be around 3 lbs or less for Webers. Any sugestions other than tearing apart half the car to install an AN6 return line?
Two things:
1. I'd run a temporary larger return into a bucket and see if it proves AN4 to be too small. Or you have a restrictive fitting somewhere.
2. Maybe your mechanical pump pulses and the bypass reg is oscillating and unable to control the bypass volume. I run a Mallory gerotor 140G/hr electric pump. Smoother fuel flow from the pump. ;)

Caprimaniac 06-30-2008 04:23 PM
My guess is: too tight return lines. I run a Aeromotive regulator and they advice 1/2" return line (corresponds to AN8..) for my application (engine front, tank rear, carb at 3 psi).

Gary have some great suggestions. Should be tried.

Snakebit 07-03-2008 04:50 PM
Changed to a 6AN line and used a lighter spring. Solved the problem.


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