The 1991-2010 4.0L Ford Explorer (Mercury Mountaineer) fuel pressure specifications.
| 1991-1993 | ||
|---|---|---|
| Engine | KOEO | KOER |
| 4.0L Explorer | 35-40 PSI | 30-45 PSI |
| 1994-1996 | ||
|---|---|---|
| Engine | KOEO | KOER |
| 4.0L Explorer | 35-45 PSI | 30-40 PSI |
| 1997-1998 | ||
|---|---|---|
| Engine | KOEO | KOER |
| 4.0L Explorer (Mountaineer) | 30-45 PSI | |
| 1999 | ||
|---|---|---|
| Engine | KOEO | KOER |
| 4.0L Explorer (Mountaineer) | 57-73 PSI | |
| 2000-2001 | ||
|---|---|---|
| Engine | KOEO | KOER |
| 4.0L Explorer (Mountaineer) | 55-65 PSI | |
| 2002-2003 | ||
|---|---|---|
| Engine | KOEO | KOER |
| 4.0L Explorer (Mountaineer) | 60-65 PSI | 60-65 PSI |
| 2004-2010 | ||
|---|---|---|
| Engine | KOEO | KOER |
| 4.0L Explorer (Mountaineer) | 30-40 PSI | 30-40 PSI |
| 2004-2005 | ||
|---|---|---|
| Engine | KOEO | KOER |
| 4.0L Explorer Sport Trac (only) | 60-65 PSI | 60-65 PSI |
KOEO = Key On Engine Off.
KOER = Key On Engine Running.
You can find the fuel pressure test explained in a step-by-step manner here:
Where To Buy A Fuel Pressure Gauge
The following fuel pressure test kits have the Ford Schrader valve adapter you'll need to connect the fuel test gauge to the fuel injector rail.
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More Ford 4.0L Explorer (Mercury Mountaineer) Tutorials
You can find a complete list of 4.0L Ford Explorer (Mercury Mountaineer) tutorials in this index:
Here's a small sample of the tutorials you'll find in the index:
- How To Test The Fuel Pump (1993-2000 4.0L V6 Ford Explorer, Aerostar, And Mercury Mountaineer).
- How To Test Engine Compression (1991-2010 4.0L V6 Ford Explorer, Aerostar, And Mercury Mountaineer).
- How To Troubleshoot A No-Start Problem (1991-2010 4.0L V6 Ford Explorer, Aerostar, And Mercury Mountaineer).
- How To Test For A Blown Head Gasket (1991-2010 4.0L V6 Ford Explorer, Aerostar, And Mercury Mountaineer).
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