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Home >> Ford >> 2004 >> Freestar Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 91 (Engine Controls - System & Component Testing - 7.3L Diesel) >> Engine Performance Diagnostic Procedures >> Test 8A: Fuel Pressure Test >> Recommended Procedure
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Recommended Procedure

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Ford RV Cutaway, 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, and 2003 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure fuel tank has fuel. Ensure fuel pump has power and ground. Fuel pump is located on driver's side frame rail. Turn ignition on. Using DVOM, check for battery voltage between 2 circuits at fuel pump. Battery voltage should be present for about 20 seconds after ignition is on. If voltage is as specified, go to next step. If voltage is not as specified, perform TEST FK: FUEL PUMP MONITOR CONTROL (ECONOLINE, EXCURSION & F250-550) under SYSTEM TESTS in SELF-DIAGNOSTICS - 7.3L DIESEL article.
  2. On Econoline, remove doghouse cover. On all models, remove 1/8" pipe plug and install fuel pressure gauge at top rear of left cylinder head (Econoline), or top front of right cylinder head (Excursion and F250-550). See Figure and Figure or Figure . Start engine and allow it to idle. Check for leaks from the line to gauge. Go to next step.
  3. Check fuel pressure with a full load on the engine. DO NOT brake torque engine for more than 10 seconds. If fuel pressure is 45 psi (310 kPa) or more, go to TEST 8B: FUEL PRESSURE TEST . If fuel pressure is less than 45 psi (310 kPa), go to TEST 8C: ELECTRIC FUEL PUMP PRESSURE TEST .
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