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.
1990 Isuzu Impulse AutomaticFACTORY OEM SERVICE PROCEDURE
Trooper 2.8L
- Disconnect negative battery cable. Loosen fuel tank filler cap to relieve air pressure.
- Cover fuel inlet line fitting at throttle body with shop towel. Loosen fitting slowly to release fuel pressure.
- Internal constant bleed feature of throttle body releases most fuel pressure when engine is turned off. When fuel stops leaking, tighten fitting. Reconnect negative battery cable.
FUEL PUMP RELAY LOCATION
| Model | Location |
|---|---|
| Amigo & Pickup | On Right Fender Panel, Near Battery |
| Impulse | On Left Fender Panel, Behind Battery |
| Trooper | On Left Firewall, Near Brake Master Cylinder |
Factory Service Tools
Use the Manual With the Right Hardware
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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.