Fuel Pressure Measurement - Revised Procedure
SECTION:2
GROUP:
23
NO.:
930
DATE
July -96
Fuel pressure measurement
B6254 and B6304 engines
REFERENCE: TP 32043/1, SECTION 2(23, 28) MULTIPORT FUEL INJECTION(MFI) SYSTEM LH 2.4; 700/900 1989-
TP 2305201, SECTION 2 (23,28) MULTIPORT FUEL INJECTION MFI AND ELECTRONIC IGNITION (EI) SYSTEM MOTRONIC 1.8; 960 1991-
This service bulletin supersedes earlier SB 23-930 dated March 1996, which should be discarded.
Fuel pressure measurement
Fuel pressure can be measured with the engine running and the car stationary and while the car is being driven. When diagnosing engine performance, driving with a fuel pressure gauge is sometimes beneficial. This service bulletin describes the procedure for measuring fuel pressure While the car is being driven. Fuel pressure measurement with the engine running and the car stationary is described in the Service Manual, Section 2(23, 28) Multi port Fuel Injection (MFI) and Electronic Ignition (EI) System, refer to the appropriate type of fuel and ignition system for the car.
Special tools:
Fuel pressure gauge with 7-type valve, hoses and nipple 999 5011-5
Evacuation unit with hose for connection to T valves 981 2270,-2273,-2282.
Adapter hose with 90° angle and nipples Refer to Shop Equipment Bulletin # 30
Kent Moore part No J-41031-A.
Contents:
Assembling the equipment
Connecting fuel pressure gauge
Connecting the evacuation unit
Measuring fuel pressure
Disconnecting fuel pressure gauge
Disconnecting the drainage equipment
Assembling the measuring equipment
Operations:
- Assemble fuel pressure gauge 999 5011 and new adapter hose J-41031-A
- Use foam wrapping around the fuel pressure gauge and all metal joints to avoid scratching the interior of the car or damaging the exterior paintwork.
Connecting the fuel pressure gauge
Operations:
- Remove the protective cap from nipple on the fuel manifold at the rear of the engine.
- Attach the adapter hose nipple loosely to the nipple on the fuel pressure line. (The nipple will be tightened later).
- Arrange hose as shown.
Note!
Ensure that the hose follows the rubber trim on the cowl cover, and then out of the engine compartment at the rear corner of the hood, with the adapter hose joint at the T-valve outside the engine compartment, so that neither the hose or the hood are damaged when the hood is closed.
- Attach the T-valve to the left door mirror using tape.
Note!
Use foam protection on the door mirror and the wing edge as shown in the illustration to prevent damage to the bodywork.
Connecting the fuel evacuation unit
Operations:
- Connect the fuel evacuation unit hose to the T-valve on the door mirror.
- Turn the T-valve cock to the middle position (position 2 in the illustration).
- Start the evacuation unit to get suction in the measurement unit hose to the engine.
Connecting the fuel evacuation unit Operations:
- Tighten the adapter hose connection nipple at the fuel manifold nipple at the rear of the engine.
Caution!
Check that there is no fuel leakage and that the evacuation unit is operating while the nipple is connected to the engine.
- Turn the T-valve cock so that it is pointing toward the engine (position 1 in the illustration) to shut off the suction from the drainage equipment.
- Use a tie-strap to lock the cock in the position toward the engine.
- Remove the evacuation unit hose from the T-valve hose connection.
- Turn off the evacuation unit when the hose is empty.
- Arrange the hose along the cowl cover's rubber trim to the left of the hood hinge so that neither the hood or the hose are damaged.
- Carefully close the hood.
Measuring fuel pressure
Operations:
- Start engine.
- Read off fuel pressure while stationary as described in the Service Manual. Section 2(23, 28) Multiport Fuel Injection (MFI) and Electronic Ignition (EI) System, (refer to the appropriate manual for the fuel and ignition system on the car)
- Drive car and read off fuel pressure while the car is being driven.
The fuel pressure should be:
210-310 kPa
Note!
At constant engine loads the fuel pressure should be stable. At acceleration or during engine braking the fuel pressure may vary between the maximum and minimum readings.
Disconnecting fuel pressure gauge
Operations:
- Connect the evacuation unit hose to the hose nipple on the door mirror (see arrow).
- Start the evacuation unit so that there is suction in the hose.
- Remove the tie-strap locking the cock on the T-nipple.
- Turn the cock to the middle position (position 2) to obtain suction in the hose to the nipple in the fuel manifold on the engine.
Disconnecting evacuation unit
Operations:
- Remove adapter hose from the engine.
- Wait a few minutes in order for the hose to empty.
- Turn off the evacuation unit
- Remove the measurement equipment and hoses from the car.
- Reinstall the protective cap on nipple on fuel manifold at the rear of the engine
WARRANTY STATEMENT: Claims may be submitted under the New Car Limited Warranty when there is a fuel related customer complaint and a manufacturing defect is present using claim type: O1 or O2
Operation No. Labor description Time allowance
23806-3 Fuel pressure checking while driving - 960 0.8 hr