What was the fuel pressure on a 1985 Corvette?

Tuned Port Injection (TPI) The new, more-efficient induction fuel delivery raised performance to 230 horsepower with a better torque curve. The stock fuel pressure for 1985 to 1987 C4 engines with TPI was 36 to 39 psi with the fuel pressure regulator vacuum hose connected, and 47 to 48 psi with the vacuum hose disconnected.

What was the fuel pressure on a GMC pickup?

The fuel pump required 12 lbs of fuel pressure per square inch. The minimum flow was 29 gallons per hour, while 12 volts was the minimum current requirement. The fuel pump was located inside the gas tank. Fuel Pumps: 1985-1990 GMC S15 Pickup Fuel Pump 4 Cyl. 2.5L (E) T.B.I.

Where is the throttle body fuel pump located?

As you’re already aware, the throttle body fuel injection system on your 1987 to 1995 4.3L, 5.0L, or 5.7L pickup (or SUV) uses a low pressure (12 PSI) electric fuel pump located in the gas tank.

What should fuel pressure be on a TBI fuel injection system?

Fuel Pressure is critical to the operation of a fuel injection system. Always check to insure that you have the proper fuel pressure. Fuel pressure should be a constant 10 – 15 PSI on a TBI fuel injection system and is typically around 12 – 13 psi. Higher pressure than 15 psi indicates that there is an issue with the installation.

What should fuel pressure be when running 5.7L TBI?

I have a 95 GMC K1500 with the 5.7L TBI. I recently did the heads on it and while putting everything back together replaced the stock fuel pressure regulator with an adjustable unit from Jet. I noticed that the only publicated pressure recommendations I can find are that it should be between 9-13 PSI with engine off and pump on, I believe.

As you’re already aware, the throttle body fuel injection system on your 1987 to 1995 4.3L, 5.0L, or 5.7L pickup (or SUV) uses a low pressure (12 PSI) electric fuel pump located in the gas tank.

Where is the test port for fuel pressure?

There is no test port for fuel pressure. You have to check it at the fuel pump or back of the throttle body. 9-12 PSI I think. If you need a pump get a EP 381 instead of the EP 386. There is a red wire sticking out of the relay for testing.

What is the TBI code on a 1990 Chevy truck?

Consult a service manual or see below for any check engine light code definitions. You can use a late 80’s or early 90’s GM TBI definition. If you have access to a scan tool use a hook up for a 1990 350 cu. in. 5.7L Chevrolet truck. For some scan tools enter VIN 10th“L” 3rd“C” 8th“K”.

What should the fuel pressure be on a C4 Corvette?

For the 1988 to 1996 C4 corvettes, the stock fuel pressure is 40 to 42 psi with vacuum hose connected and 47 to 48 psi with the vacuum hose disconnected.

Where is the fuel pressure gauge on a corvette?

Fuel pressure can be measured at the Schrader valve on the fuel rail with a fuel pressure gauge. Many of the original stock fuel pressure regulators were not adjustable. If fuel pressure is not within specifications, check the fuel filter, fuel pump and regulator in that order. “1986 Corvette Shop Manual”; General Motors; 1996.

What was the fuel delivery system for the 1985 Corvette?

The 1985 C4 Corvette marked the introduction of the new Tuned Port Injection (TPI) fuel delivery system. The new, more-efficient induction fuel delivery raised performance to 230 horsepower with a better torque curve.

For the 1988 to 1996 C4 corvettes, the stock fuel pressure is 40 to 42 psi with vacuum hose connected and 47 to 48 psi with the vacuum hose disconnected.

Can you change the fuel pump on a corvette?

01: In the old days, changing a fuel pump on 1953-1981 Corvettes was a pain in the neck. It was hard to reach. The task was sometimes messy. Because the pump was low in the system, you had to seal off the fuel lines. You had to fuss with the fuel pump pushrod. If you were working on an air car, the HVAC compressor blocked access.

What happens when the fuel pump goes out on a corvette?

There are physical signs that you can feel when your Corvette’s fuel pump is going out. Before taking anything apart, check to see if your engine’s computer has any trouble codes saved in it. The engine may throw a P0087 trouble code. This trouble code detects that the fuel rail/system pressure is too low.

Can a bad fuel pressure regulator put a corvette out of commission?

A bad fuel pressure regulator can put your Chevy Corvette out of commission. Here are a few of the most common symptoms of a bad fuel pressure regulator: Misfire – When the fuel pressure regulator fails, it can allow too much or too little fuel into the engine.

What should the fuel pressure be on a corvette?

The GM specifications for fuel pressure was 9 to 13 psi; however, the recommendation was increased to 14 psi to eliminate occasional stumbling or if the engine wasn’t getting enough fuel at about 4,000 rpm.

What kind of engine does a 1995 Corvette have?

To learn more about the 1995 Corvette, click here . Reference – SAE J1100 Motor Vehicle Dimensions, Curb Weight Definition. * Equivalent Test Weight Class – basis for US Environmental Protection Agency emission certifications. Notes: Base Corvette Coupe with 350 cu. in. 300 hp engine and four speed automatic transmission: $36,785.00.

Where is the test valve on a fuel injection system?

1. Locate the Schrader valve. Most modern fuel injection systems come equipped with a Schrader or test valve located on the fuel rail. The valve is similar to the air valve on your tires. 2. Connect your fuel pressure gauge to the Schrader valve or test port.

When do you need to check fuel pressure?

Many times when confronted with a no start or performance problem you need to check fuel pressure. This is a helpful guide on how to go about that process. Many times a fuel pressure gauge can be rented from your local auto parts store or tool rental outlet. If you went to purchase a gauge they vary in price greatly.

How to test a fuel pressure regulator ( FPR )?

Testing for Maximum Pressure The easiest way to test an FPR is with the use of a fuel pressure gauge. But first, you’ll start your tests with a quick preliminary check: 1. Open the hood and locate the fuel pressure regulator on one end of the fuel rail. This rail holds the fuel injectors in place.

What should fuel pump pressure be on 5.0L V-8?

With the key on, engine off (KOEO), the factory manual says fuel pump pressure should be between 30 to 45 PSI for the 5.0L and 5.8L V-8 engines.