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 MANUALSGMC1991G 3500 1 TON VAN V8-379 6.2L DSLREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTFUEL DELIVERY AND AIR INDUCTIONFUEL INJECTORSERVICE AND REPAIR
1991 GMC G 3500 1 Ton Van V8-379 6.2L DSL
Fuel Injector: Service and Repair
1991 GMC G 3500 1 Ton Van V8-379 6.2L DSLSECTION Service and Repair
Injector Nozzle:
Injection Nozzles:
CAUTION: When removing an injection nozzle, use J 29873. Remove the nozzle using the 30 mm hex portion. Failure to do so will result in damage to the injection nozzle.
REMOVE OR DISCONNECT
1. Negative battery cable(s).
2. Fuel line clip.
3. Fuel return hose.
4. Fuel injection line.
- Cap the nozzle and lines.
5. Injection nozzle using J 29873.
INSTALL OR CONNECT
1. Injection nozzle using J 29873.
Tighten
- Nozzle to 70 Nm (50 lb. ft.).
2. Fuel injection line.
Tighten
- Nut to 25 Nm (20 lb. ft.).
3. Fuel return hose.
4. Fuel line clip.
5. Negative battery cables.
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.