Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET1993CAMARO Z28, STANDARD, M29REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGBASIC FUEL SYSTEM CHECKS (A-7)FUEL SYSTEM PRESSURE TEST (EXCEPT SATURN)FUEL PRESSURE CHECK (PFI)
1993 Chevrolet Camaro Z28, Standard, M29
Fuel Pressure Check (PFI)
1993 Chevrolet Camaro Z28, Standard, M29SECTION Fuel Pressure Check (PFI)
- Relieve fuel pressure as previously described in FUEL PRESSURE RELIEF (PFI). On all models except 2.0L and 2.2L, connect Fuel Pressure Gauge (J-34730-1) to fuel pressure fitting on fuel rail. On 2.0L and 2.2L, install TBI Fuel Pressure Gauge (J-29658-D) using Adapter Kit (J-29658-100). This kit modifies TBI fuel pressure gauge so it may be installed in fuel delivery line with quick-disconnect fittings. With gauge installed, turn ignition on. With ignition on and engine off, pressure should read within specification. See FUEL PRESSURE (PFI) table. If no fuel pressure is present, go to step 5).
- Start engine. Pressure should drop 3-10 psi (.2-.7 kg/cm2 ). Turn ignition off. Pressure should hold. If pressure does not hold, check for leaking injectors or fittings. If injectors or fittings are not leaking, replace pressure regulator.
- If pressure is present but less than specification, check for restricted delivery line or fuel filter. Repair as necessary. If no restriction is evident, apply battery voltage to fuel pump test connector using a 10-amp fused jumper wire. For location of fuel pump test connector, see COMPONENT LOCATIONS in I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section.
- Gradually pinch off fuel return line between gauge and fuel tank. If fuel pressure increases to within specification, replace fuel pressure regulator. If fuel pressure does not increase with line pinched, check for faulty in-tank fuel pump or partially blocked fuel strainer.
- Apply battery voltage to fuel pump test connector using a 10-amp fused jumper wire. For location of fuel pump test connector, see COMPONENT LOCATIONS in I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section. Observe fuel pressure reading. If fuel pressure is still not present, check wiring between test connector and fuel pump. If wiring is okay, replace fuel pump.
- If fuel pressure is present with voltage applied to test connector, test fuel pump relay and voltage supply to relay. See I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section.
FUEL PRESSURE
| Application | psi (kg/cm2 ) |
|---|---|
| All Except 4.9L Cadillac | 41-47 (2.88-3.30) |
| 4.9L Cadillac | 40-50 (2.81-3.50) |
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.