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.
The following tools ARE NOT cheap knock-off tools, but inexpensive known automotive brand tools you can count on giving a long service life.
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 (Ford 4.0L Aerostar, Ranger, Explorer).
- How To Test Engine Compression (1991-2010 4.0L Ford Explorer, Aerostar, Mercury Mountaineer).
- How To Troubleshoot A No-Start Problem (4.0L Ford Explorer, Aerostar, And Mercury Mountaineer).
- How To Test For A Blown Head Gasket (Ford 4.0L Explorer, Aerostar And Mercury Mountaineer).
If this info saved the day, buy me a beer!
