Checking Fuel Pressure: 1987 Chevy Silverado Guide

If you're experiencing issues with your 1987 Chevy Silverado, it could be beneficial to check the fuel pressure. This can help you identify any problems with the fuel delivery system, such as a faulty fuel pump or a leak in the fuel line. To check the fuel pressure, you'll need to invest in a fuel pressure tester kit, which typically includes an adapter and a fuel pressure gauge. You'll also need some basic tools like wrenches to remove certain components and potentially some new parts, such as a fuel filter, depending on the specific instructions for your vehicle's make and model. It's important to exercise caution when working with flammable gasoline and to seek professional assistance if you're uncomfortable with the process or unsure about the results.

Checking TBI fuel pressure with an Actron kit

To check the TBI fuel pressure with an Actron kit, you will need to purchase either the Professional Fuel Pressure Tester Kit or the GM TBI Fuel Pressure Tester. The former is more versatile and can be used on all makes and models with a Schrader valve test port on the fuel rail, as well as Asian, European, and domestic makes with a "banjo bolt" connection. It can also be used on all makes and models with a detachable rubber hose connection at the fuel rail, fuel line, or fuel filter. The latter is designed specifically for GM TBI vehicles not equipped with a Schrader or fuel access valve test port on the fuel line.

Once you have purchased the appropriate Actron kit, follow the instructions provided with the kit to safely test your vehicle's fuel pressure system. The Actron website provides operating instructions in English, French, and Spanish for the Professional Fuel Pressure Tester Kit (CP7838) and the GM TBI Fuel Pressure Tester (CP7817).

It is important to note that the Fuel Pressure Tester Kits should not be used with diesel or flex fuels.

In addition to the Actron kit, you may also need to purchase a GM TBI adapter if you are using the Fuel Pressure Tester Kit with a GM TBI vehicle. This is mentioned in the product brochure for the Fuel Pressure Tester Kit (CP7818).

• Fuel pump check valve issues
• Fuel pressure regulator problems
• Clogged or damaged fuel filter
• Leaking injectors

Using a generic OTC brand fuel filter adapter

To check the fuel pressure on a 1987 Chevy Silverado using a generic OTC brand fuel filter adapter, follow these steps:

First, purchase the OTC 7665 fuel pressure adapter, which costs around $53.95. You will also need a fuel pressure gauge, PB blaster or other penetrating oil/lubricant, a line wrench, and possibly other wrenches to hold the fuel filter. It is also recommended to have a new fuel filter on hand, as you will be removing the old one. Have buckets, rags, and paper towels ready, as your fuel lines will leak fuel during the process.

The fuel filter is typically located on the frame rail just underneath the driver's seat. Hold the fuel filter in place while trying to loosen the line nuts with your line wrench. Do not use any other kind of wrench on these nuts, as this may strip them. Take your time, as the fuel lines may be rusty if they have never been replaced.

Your goal is to remove the fuel filter and install the adapter in its place. Be careful not to break the fuel line while removing the filter, as this will need to be repaired before you can test the fuel pressure. The OTC adapter has a quick-disconnect fitting that should not leak fuel. However, if yours leaks fuel easily, it is recommended to connect it with the truck turned off.

Once the adapter is in place, you can start the truck and connect your fuel gauge. Note that there is hot exhaust in the path of the fuel stream, so be cautious to avoid any accidents. Turn off the truck before disconnecting the fuel pressure gauge.

After you have checked the fuel pressure, be sure to remove the adapter when you are done.

Removing the air cleaner

To check the fuel pressure on a 1987 Chevy Silverado, you will need to remove the air cleaner. Here is a step-by-step guide on how to do this:

Begin by standing on the driver's side of the truck and locating the air cleaner. You will need to take off the air cleaner to access the throttle body. Once you have located the air cleaner, use a wrench to remove it. Place the open-end wrench on the throttle body's fuel line nut that is closest to you. You may also need a line wrench for this step.

Next, take the fuel line adapter and screw it into the throttle body. Ensure that you do not over-tighten it, as the adapter is made of brass and can easily strip. The Schrader valve on the adapter will swivel, so you don't need to worry about its direction.

Now, connect the fuel line. Again, be careful not to over-tighten it. Just make sure that both the adapter and the fuel line are snug. You can tighten them, but avoid using excessive force.

At this point, you should connect your fuel gauge. It is important to do this before starting the truck. The fitting used for this step can leak quite a bit while connecting, so be cautious to avoid spilling gasoline on top of your engine, as this can be dangerous. It is recommended to tuck the gauge under the hood and hold it by your door while standing outside the truck.

After connecting the fuel gauge, you can start the truck and watch the pressure. General Motors states that acceptable fuel pressure readings are between 9 and 13 PSI.

Remember to turn off the truck before disconnecting the fuel pressure gauge.

By following these steps, you will be able to safely remove the air cleaner and check the fuel pressure on your 1987 Chevy Silverado.

Using a 3/4 open-end wrench

To check the fuel pressure on a 1987 Chevy Silverado using a 3/4 open-end wrench, follow these steps:

First, take off your air cleaner and stand on the driver's side of the truck. Look at the back of the throttle body (TB) and put your 3/4 open-end wrench on the TB's fuel line nut closest to you, and the other on the actual fuel line. If your fuel line is made of braided steel, be aware that it may be a factory line or it may have been replaced at some point.

Next, take the fuel line adapter and screw it into the TB first. This will make it easier to get situated behind your throttle cable bracket. Be careful not to over-tighten the adapter, as it is made of brass and can easily strip inside the steel threads. The Schrader valve on the adapter will swivel, so you don't need to worry about where it is pointed.

Now, connect your fuel line, again being careful not to over-tighten. You can tighten the line and adapter, but don't overdo it. Connect your fuel gauge before you start the truck. This fitting was used on old R12 air conditioning systems and leaks quite a bit while connecting the gauge. Leaking gasoline on top of your engine can be dangerous, so be cautious. Tuck the gauge under the hood and hold it by your door while you stand outside the truck and crank it. This way, you can watch the truck prime and observe the pressure after it's running.

Acceptable fuel pressure readings, according to General Motors, are between 9 and 13 PSI. While a little higher than 13 PSI won't hurt, anything lower than 9 will definitely impact performance. Remember to turn off the truck before disconnecting the fuel pressure gauge.

Checking the fuel line

To check the fuel line on a 1987 Chevy Silverado, you will need to perform a fuel pressure test. This will help you identify any issues with the fuel delivery system, including the fuel pump, fuel filter, fuel lines, and fuel injectors. Here is a step-by-step guide on how to check the fuel line:

Step 1: Prepare the Necessary Tools and Safety Equipment

• Wear appropriate safety gear, including gloves and eye protection, when working with any automotive fuel system.
• Gather the tools required for the job, such as wrenches, a fuel pressure gauge, and a fuel line adapter. You may also need a new fuel filter and some rags or paper towels to catch any spilled fuel.

Step 2: Locate the Fuel Filter and Fuel Lines

• The fuel filter on a 1987 Chevy Silverado is typically located on the frame rail, just underneath the driver's seat.
• Identify the fuel lines connected to the fuel filter. These are the lines you will be working with to perform the fuel pressure test.

Step 3: Disconnect the Fuel Lines and Install the Fuel Line Adapter

• Use line wrenches to carefully loosen and detach the fuel lines from the fuel filter. Do not use any other type of wrench to avoid stripping the nuts.
• If your fuel filter is difficult to reach, you may need to hold the fuel filter steady with one hand while loosening the line nuts with the other.
• Once the fuel lines are disconnected, install the fuel line adapter. This adapter will allow you to connect the fuel pressure gauge and perform the fuel pressure test.

Step 4: Connect the Fuel Pressure Gauge

• With the fuel line adapter in place, connect the fuel pressure gauge to the adapter. Ensure that all connections are secure but be careful not to over-tighten, as this can strip the threads.
• Leaking fuel can be dangerous, so it is recommended to tuck the gauge under the hood and stand outside the vehicle when starting the engine.

Step 5: Start the Engine and Observe Fuel Pressure

• Before starting the engine, ensure the fuel pressure gauge is connected and you are standing in a safe position.
• Start the engine and observe the fuel pressure gauge. General Motors recommends acceptable fuel pressure readings between 9 and 13 PSI for the Chevy Silverado.
• A reading lower than 9 PSI will likely affect the vehicle's performance, while a slightly higher reading is typically not an issue.

Step 6: Turn Off the Engine and Disconnect the Gauge

• Once you have recorded the fuel pressure reading, turn off the engine.
• Carefully disconnect the fuel pressure gauge from the adapter.
• If you are using the Actron tester, you can leave the adapter in place. However, if you are using a different adapter, such as the OTC brand fuel filter adapter, it will need to be removed.

Step 7: Reinstall the Fuel Filter or Install a New One

• If you removed the fuel filter during this process, now is the time to reinstall it or install a new one.
• Ensure all connections are secure and tight before starting the engine again.

Step 8: Address Any Issues

• If the fuel pressure test indicates low fuel pressure, you may need to replace the fuel pump, repair leaky fuel lines, or address clogged fuel injectors.
• Always refer to a professional mechanic if you are unsure about any part of this process or if you identify issues that need further diagnosis or repair.

Frequently asked questions