Mechanical Fuel pump Questions, Recirculation
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Mountain Pass
Joined: Feb 2002
Posts: 243
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From: Houston USA
Mechanical Fuel pump Questions, Recirculation
I have a 1986 F350 with 460 with a Mechanical Pump. Yes it originally has a mechanical pump on the engine. It has dual tanks. On the outlet side of the pump, it has two outlets, one goes to the carb, and the other to return line to the tanks. Does anyone know how the pressure is regulated?
Thanks
Mark
Thanks
Mark
Senior User
Joined: Dec 2007
Posts: 104
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Usually on carburetor systems the pump is fixed at a range of output pressure and then the carburetor does the rest.
Somewhere around 3-7 psi I believe.
Fuel injection is much higher psi. Fuel injection usually uses a regulator and then dumps the excess back to the tank.
You can look up the carburetor and see it's input range if you can find the specs.
This is just general info, hope it helps.
Somewhere around 3-7 psi I believe.
Fuel injection is much higher psi. Fuel injection usually uses a regulator and then dumps the excess back to the tank.
You can look up the carburetor and see it's input range if you can find the specs.
This is just general info, hope it helps.
Moderator
Joined: Jan 2001
Posts: 56,984
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From: Virginia
On the 460 electric pump system, they just used a fitting at the carb with a pre-drilled orifice, that let a portion of the fuel recirculate, to keep it cool. No fancy regulators on that system. So that may be the way they did your system too, with a drilled port supplying the return line at the pump.
