Excessive fuel, wont start

jakec8 · Jun 19, 2009

Hi, I'm new to this forum and would like to know what could be wrong with my ranger? Its a 92 with the 4.0 and fuel just runs out of the throttle body and it wont start or run. Could it be the fuel pressure regulator? I pull the air cleaner assembly off and the fuel just runs out in a stream. Any help would be greatly appreciated as it sits in another part of the state and I'd like to drive it home since its my only vehicle! Please help!!!
Thanks in advance!
Jake

nitrofan1 · Jun 20, 2009

The pressure regulator doesn't really regulate the fuel pressure to the injectors. It lets the fuel bleed back to the tank via the return hose when not needed. Sounds like you have bad fuel injector o rings or a bad plenum gasket. Either way it's time for a intake gasket removal & replace. If this hasn't been done before there's no time like the present. The intake & valve covers are notorious for leaks. If you do this get the improved Fel Pro kit.

Intake kit # MS98005T
Valve cover kit # VS50368T

These were designed to "fix" the issues with the not so perfect Ford intakes & valve covers sealing the way they should.

Donnie strickland · Jun 20, 2009

From the Ford service manual:

"PURPOSE
The fuel pressure regulator controls fuel pressure supplied to the injectors. The regulator also traps fuel during engine shutdown, thus eliminating the possibility of vapor formation in the fuel line, and provides instant restarts and initial idle speed.

OPERATION
Balancing one side of the diaphragm with manifold vacuum maintains a constant fuel pressure drop across the injectors. Fuel in excess of that used by the engine is bypassed through the regulator and returns to the fuel tank.

CONSTRUCTION
The regulator is a spring loaded diaphragm operated relief valve. One side of the diaphragm senses fuel pressure and the other side is connected to intake manifold vacuum."

If your regulator has a ruptured diaphragm, it can dump excess fuel into the manifold, and thus it will never build enough pressure to allow the fuel pump to cut off. You can check for a ruptured diaphragm by pulling the vacuum line off the regulator. If fuel is present in the vacuum line, your regulator is shot.

It may not be this, but it's easy to check, and therefore rule out.

Excessive fuel, wont start

jakec8

10+ Year Member

nitrofan1

Man without a Ranger

Donnie strickland

15+ Year Member

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