Pressure Relief In Manual Fuel Pump

[Grumpy]

On a engine I just purchased, the mechcanical fuel pump on it only has 2 fuel lines, 1 in and 1 out, naturally. But the fuel pump on my old engine had a 3rd 1/4 " line, I am assuming is a pressure relief line back to the tank. Does the 2 line pump have an internal relief? Thanks!

yes, in many cases , a mechanical fuel pump will have a pressure regulator,
but not all.(and in many cases its rather inconsistent and less that accurate)
youll be much better off using a fuel pressure regulator and return line set -up.
read through ALL these links

http://garage.grumpysperformance.co...-big-a-fuel-pump-do-you-need.1939/#post-95149

http://garage.grumpysperformance.co...ts-inside-a-manual-fuel-pump.5365/#post-16067

http://garage.grumpysperformance.com/index.php?threads/setting-up-your-fuel-system.211/

http://garage.grumpysperformance.co...ir-ratios-that-gets-ignored.15506/#post-92064

http://garage.grumpysperformance.com/index.php?threads/fuel-pressure-regulators.635/

http://garage.grumpysperformance.co...ss-fuel-pressure-regulators.12776/#post-65998