Fuel Pressure Gauge - Revised Readings

File In Section: 6E - Engine Fuel & Emission

Bulletin No.: 81-63-05

Date: March, 1998

SERVICE MANUAL UPDATE

Subject:
Section 6E - Engine Controls Revised Fuel Pressure Gauge Readings

Models:
1998 Cadillac Concours, DeVille, Eldorado, Seville
1998 Oldsmobile Aurora
with 4.0L, 4.6L Engine (VINs C, Y, 9 - RPOs L47, LD8, L37)

This bulletin is being issued to revise the fuel pressure gauge readings in Section 6 of the Service Manual.

The correct fuel pressure specification for the 4.0L and 4.6L engines (RPOs L47, LD8 and L37) is 331 to 380 kPa (48 to 55 psi.). Please make the changes outlined below in the following 1998 Service Manuals:

^ E/Ksp Platform, Volume 3 of 3 (GMP/98-EKS-3), Pages 6-716 to 6-724

^ G Platform, Volume 3 of 3 (GMP/98-G-3), Pages 6-1506 to 6-1513

^ K Platform, Volume 3 of 3 (GMP/98-K-3P), Pages 6-777 to 6-784

Fuel Systems Pressure Test - Test Descriptions

Step 2 should read 331 to 380 kPa (48 to 55 psi.)
Step 12 should read above 380 kPa (55 psi.)
Step 15 should read below 331 kPa (48 psi.)
Step 16 should read above 380 kPa (55 psi.)

Fuel System Pressure Test Diagnostic Table

Step 2 should read 331 to 380 kPa (48 to 55 psi.)
Step 12 should read above 380 kPa (55 psi.)
Step 13 should read 331 to 380 kPa (48 to 55 psi.)
Step 16 should read 331 to 380 kPa (48 to 55 psi.)
Step 25 should read 331 to 380 kPa (48 to 55 psi.)

Fuel Injector Balance Test Diagnostic Table

Step 5 should read 331 to 380 kPa (48 to 55 psi.)