Fuel Pressure Specifications in a 1998 Chevrolet Silveradoby Leonardo R. Grabkowski
The 1998 Silverado, which is officially known as the C/K1500, is a full-size truck sold by General Motors through the Chevrolet brand. The 1998 Silverado was available with three engines: a 4.3-liter V-6, a 5.0-liter V-8 and a 5.7-liter V-8. The fuel-pressure specification between the V-6 and the V-8 engines is different.
Fuel Pressure Specification
The fuel pressure specification for the 1998 Chevrolet Silverado truck is from 55 to 61 lbs. per square inch (psi) for models equipped with the 4.3-liter V-6. Trucks with either the 5.0-liter or 5.7-liter V-8 should have fuel pressure between 60 and 66 psi. As long as the fuel pressure is within the normal range, the fuel system is likely operating normally. If the fuel pressure is low, common symptoms include rough idling and engine hesitation. If the fuel pressure is too high, the most common symptom is an engine running rich, which can cause performance and efficiency issues, as well as emissions issues.
Checking the Fuel Pressure Specification
To check the fuel pressure specification, you'll need a fuel pressure gauge, a small tool available at most automotive stores. Turn off the 1998 Silverado's engine and open the truck's hood. Open the fuel door and loosen the fuel cap to vent the tank. Hook the fuel pressure gauge to the test port on the engine's fuel rail, located on the passenger side of the engine compartment. Turn the engine key to "On" without starting the truck's engine. The fuel system will pressurize and your gauge will give you an accurate reading.
Common Problems with Fuel Pressure
The Silverado's fuel system is a complicated network of parts. For fuel pressure problems, it's best to seek the assistance of a Chevrolet dealer or a certified mechanic. If your Silverado's fuel pressure is too low, common causes include a clogged fuel filter and a bad fuel pump or fuel pump relay. If the fuel pressure is too high, the most likely cause is a bad fuel regulator or a clogged fuel return line.
- "1988 to 1998 Chevy C/K1500 Repair Manual"; 1999; Haynes
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