There are a few potential causes for high fuel pressure, and the method of lowering it depends on the root cause:
* Faulty Fuel Pressure Regulator (FPR): This is the most common culprit. The FPR is usually integrated into the fuel rail or near the fuel rail on many Ford Explorers. A faulty FPR might be stuck open, allowing excessive pressure. Replacing the FPR is the most likely solution. You'll need to consult a repair manual specific to your vehicle's engine to locate the FPR and perform the replacement.
* Blocked Fuel Return Line: A clogged return line can prevent fuel from returning to the tank properly, building up pressure. This requires inspecting and cleaning or replacing the fuel return line.
* Faulty Fuel Pump: A malfunctioning fuel pump can also contribute to high pressure, though this is less common than a faulty FPR.
* Incorrect Fuel Pressure Gauge Reading: Before you start replacing parts, double-check your fuel pressure gauge reading. An inaccurate gauge will lead you down the wrong path.
How to *potentially* lower the pressure (if it's the FPR): You should *not* attempt to adjust the FPR pressure directly unless you know precisely what you're doing. Improper adjustment can lead to significant engine damage.
The proper way to lower the pressure is to replace the FPR with a new, correctly functioning one. This will restore the fuel pressure to the correct specification.
Before you do anything:
1. Safety First: Disconnect the negative battery cable before working on any fuel system components. Fuel is highly flammable.
2. Consult a Repair Manual: A repair manual specific to your 2000 Ford Explorer XLT's engine is essential. It will show you the location of the FPR, the correct fuel pressure specifications, and the proper procedure for replacement.
3. Professional Help: If you're not comfortable working on fuel systems, take your vehicle to a qualified mechanic. Improperly working on a fuel system can be very dangerous.
Attempting to manually adjust fuel pressure without proper knowledge and tools could damage your engine. A new FPR is the most likely and safest solution. Get the correct part for your specific engine (4.0L SOHC or 4.0L OHV).
