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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 06-17-2014
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I am: Danny Caudill
Join Date: Apr 2011
Location: Premium, KY
Vehicle: 1999 Ford Ranger
Posts: 26
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1999 ranger fuel pressure

I recently replaced the fuel pump. As in a few days ago. When I check the fuel pressure I get 65psi. Most places I've looked say 30-35psi. Which one is correct? Truck is drinking the fuel and exhaust smells like raw fuel. Help please
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Old 06-18-2014
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I am: Ron Dean
Join Date: Jan 2014
Location: Vancouver, BC
Vehicle: 1994 Ford Ranger
Drive Type: 4x4
Engine: 4.0
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Both are correct depending on the year of the vehicle.

In 1998 Rangers switched to a "returnless" fuel system, which runs at 65psi

Prior to that the fuel systems used a fuel pressure regulator(FPR) and return line, it ran at 35psi

Assuming you have the original 1999 engine and fuel system you should see 65psi at the rail.
On the back of one of the rails is a "Pulse Damper", it will have a vacuum line attached to it, check that vacuum line for fuel.
The vacuum line is a safety feature in case the rubber diaphragm leaks, fuel would be sucked into the intake instead of dripped on hot engine and exhaust, a bad thing, lol.

You could also have a stuck open injector, use a small hose as a stethoscope and listen to each injector with engine idling, should hear a steady tick, tick, tick from each.
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Old 06-25-2014
I am: Jesse Smith
Join Date: Aug 2011
Location: Keokuk
Vehicle: 2001 Ford Ranger XLT 2wd
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Whoa, phone messed up. Sorry for posting in the wrong thread.

Last edited by Smith; 06-27-2014 at 12:34 AM.
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